The proper torque for the L83 head bolts is 70 ft-lbs. To achieve this, you must first set the engine to top dead center (TDC). Then you will need to use a torque wrench and socket adapter to get the correct amount of force on each bolt. When tightening, make sure that all four corners are tightened evenly before moving onto the next corner.Pick up a Haynes manual for that year. The head torque sequence is important and there is no specific torque number. The Haynes manual will show you how to use a dial torque gauge, as the head bolts are rated in degrees of stretch instead of ft-lbs. This is the torque sequence, look up and purchase the dial gauge as well.As the Trailblazer SS LSA project moves forward , New CNC ported LS3 heads and American racing headers were installed. Terry goes thru the torque specs and b... Head Bolt Kit: 134-3710: Chevrolet LSA, ARP2000, 12pt: Head Bolt Kit: 234-3726: Chevrolet LS Gen III LS Series small block (2004 & later - except LS9) w/ all same length bolts, ARP2000, 12pt: Head Bolt Kit: 234-3725: Chevrolet LS Gen III LS Series small block (2003 & earlier), two lengths, ARP2000, 12pt: Head Bolt Kit: 234-3724: Chevrolet LSA ... Joe Cabral showing the proper torque sequence and proper torque of GM LS head bolts.All of Engine Quest LS Head boltsChevrolet Ls Head Bolts Set 2007 – …With T-T-Y head bolts, the Torque-To-Angle Indicator (Part Number TRQ-1) should be used in conjunction with a torque wrench to achieve proper bolt loading. While the head bolts are being torqued to the specified value, the technician can use the TRQ-1 tool to accurately measure the degrees of additional rotation required. This eliminatesLS7 Torque Specs - Pace PerformancePart Number: 134-3610 & 134-3710 Application: Chevy Gen III LS Series (2004 & later) 8740. Inspect all hardware prior to installation. Look for obvious defects or shipping damages. Please call 800-826-3045 with any questions or issues. To ensure proper thread engagement and accurate torque readings, clean all threads in the block.Head Retaining Bolt 12Y 106lbin Coolant Temperature Sensor 20Y 15lbft Crankshaft Balancer to Crankshaft Retaining Bolt • First Pass 150Y 110lbft • Second …When it comes to optimizing the performance of your Kohler engine, one crucial factor that cannot be overlooked is the torque specifications. Torque specs refer to the specific amo...Alternator Rear Bracket Torque Spec. 18 ft-lbs. A/C Compressor Torque Spec. 37 ft-lbs. 2500 6.0L engine bolt torque specs, common problems and repairs. Cylinder Head Torque specs, timing chain installation, manifolds torque specs, engine assembly.Object moved to here.Aug 29, 2022 · The 5.3 liter LS-series engine was offered from 1999-2014 and has a 3.78” bore x 3.62” stroke. The block was offered in both cast-iron and aluminum with aluminum cylinder heads. Camshaft specifications varied depending on the year and RPO code of the engine. arp head bolt torque. Has anyone used this method of tightening head bolts? This excerpt is from arp's website. 1. The friction factor changes from one application to the next. That is, the friction is at its highest value when the fastener is first tightened. Each additional time the fastener is torqued and loosened, this value gets smaller.As the Trailblazer SS LSA project moves forward , New CNC ported LS3 heads and American racing headers were installed. Terry goes thru the torque specs and b...The tightening sequence for the 5.7 Vortec engine is as follows: 1. Start with the center bolt and tighten it to the specified torque in Step 1. 2. Move to the bolts on either side of the center bolt and tighten them to the specified torque in Step 1. 3. Continue alternating between the bolts on each side, moving outward from the center, and ...ARP Ultra-Torque. ™. Fastener Assembly Lubricant. Today's critical - head studs and bolts, main studs and bolts, and driveline - have been designed stronger than ever before to handle the extreme loads. As a results, installation pre-loads - the amount the fastener is stretched during installation - are very high.With T-T-Y head bolts, the Torque-To-Angle Indicator (Part Number TRQ-1) should be used in conjunction with a torque wrench to achieve proper bolt loading. While the head bolts are being torqued to the specified value, the technician can use the TRQ-1 tool to accurately measure the degrees of additional rotation required. This eliminatesAug 29, 2022 · The 5.3 liter LS-series engine was offered from 1999-2014 and has a 3.78” bore x 3.62” stroke. The block was offered in both cast-iron and aluminum with aluminum cylinder heads. Camshaft specifications varied depending on the year and RPO code of the engine. Torque Efficiency. Compared to sbc head bolts vs. studs, head studs can be tightened without applying the clamping force. ... So, there is no “ls ARP head bolts vs. studs'' kind of questions valid here. For example, when ARP makes hex nuts, the process is so precise that the product turns out with an accuracy of 0.001 inches! That's ...A substantial upgrade from OEM torque-to-yield (TTY) rod bolts that can only be used once, ARP ® offers both “Hi-Performance Series” bolts made of 8740 chrome moly steel and are nominally rated at ... 100-7524 – Black oxide (hex head) valve cover bolts for LS Series w/0.375" spacer 100-7523 – Black oxide (12-point head) valve cover ...This particular block is the 2/2004 & later style that requires (10) 4" medium head bolts for each cylinder head. This cylinder block does not use 6" long bolts as required for the early style block. Head Bolt Torque (for OEM head bolts only, if using performance bolts/studs refer to the manufacturer’s specifications): refer to the diagram ... Applying the correct tightening values for threaded engine fasteners is critical for any engine build. Listed here are both factory OEM values, some of which involve a torque-plus-angle tightening method, and OEM and aftermarket values which require only a tightening-by-torque (or by monitoring rod bolt stretch) approach. DGAP Preliminary announcement financial reports: LS telcom AG / Preliminary announcement on the disclosure of financial statements LS telcom A... DGAP Preliminary announcement fin...With T-T-Y head bolts, the Torque-To-Angle Indicator (Part Number TRQ-1) should be used in conjunction with a torque wrench to achieve proper bolt loading. While the head bolts are being torqued to the specified value, the technician can use the TRQ-1 tool to accurately measure the degrees of additional rotation required. This eliminatesThe LS head bolt torque for the third generation (LS1 and LS6) starts with bolts 1 to 10 and is 22 ft-lb for the first pass, 90° for the second pass, 90° for bolts 1 to 5, and 50° for bolts 6 to 10 for the third pass, and 22 ft-lb for bolts 11 to 15 for the final pass.Joe Cabral showing the proper torque sequence and proper torque of GM LS head bolts.All of Engine Quest LS Head boltsChevrolet Ls Head Bolts Set 2007 – …Crankshaft Position Sensor Bolt. 18 lb ft. Cylinder Head Bolts (First Pass all M11 Bolts in Sequence) 22 lb ft. Cylinder Head Bolts (Second Pass all M11 Bolts in Sequence) 90 degrees. Cylinder Head Bolts (Final Pass all M11 Bolts in Sequence-Excluding the Medium Length Bolts at the Front and Rear of Each Cylinder Head) 90 degrees.Measure the length of a bolt from the underside of the bolt head to the end of the shank, and to measure diameter, measure the widest part of the shank of the bolt. Length and diam...JEGS 555-83405 Head Bolt Kit Features: Fits 1997-2003 GM LS engines including 4.8L, 5.3L, 6.0L, 6.2L and others based on the popular platform. Ideal for engine repair when changing the cylinder heads or head gaskets. Seals cylinder heads properly at a bargain price. Made with high-quality materials.Joe Cabral showing the proper torque sequence and proper torque of GM LS head bolts.All of Engine Quest LS Head boltsChevrolet Ls Head Bolts Set 2007 – …Tighten the head bolts in the following sequence. Tighten bolts 1 through 10 to 65 lb-ft. Tighten bolts 1 through 10 to 95 lb-ft. Tighten bolts 1 through 10 to 135 lb-ft. Tighten bolts 1 through 10 to 180 lb-ft. Tighten bolts 1 through 10 to 210 lb-ft. Tighten bolts 11 through 15 to 24 Nm (18 lb-ft). Tighten bolts 11 through 15 to 31 Nm (23 lb ...The LMG engine is a 5.3L Gen. IV iron-block engine used in GM trucks and SUVs between 2007 and 2014. For marketing purposes, it was also known as the Vortec 5300. The information listed here is for a stock LMG engine. Mechanically similar, General Motors’ LS and LS-based Vortec engines wound up on almost every branch of the GM …Whenever you are looking to build your own LS swap or frankenstein LS heads and block combination, you will need the factory LS1 Torque Specifications to …Let’s use the example of tightening a head bolt. The amount of torque applied to the fastener is proportional to how much load we want to apply to the head gasket to ensure that it seals. The amount of torque applied to the head bolt accomplishes two things. ... GM LS engine head bolts, for example, are TTY fasteners that can only be …The torque specifications for automobile engine cylinder head bolts are located on the Federal-Mogul Motorparts website. The search feature is available on the Specifications Looku...0. Whenever you are looking to build your own LS swap or frankenstein LS heads and block combination, you will need the factory LS1 Torque Specifications to assemble your block correctly. Cylinder Head Bolts : 11mm x 20.0 x 155.5mm bolts: 22 ft-lb, plus 76 degrees. 11mm x 20.0 x 101.0 mm bolts: 22 ft-lb, plus 76 degrees, plus 34 degrees.The LMG engine is a 5.3L Gen. IV iron-block engine used in GM trucks and SUVs between 2007 and 2014. For marketing purposes, it was also known as the Vortec 5300. The information listed here is for a stock LMG engine. Mechanically similar, General Motors’ LS and LS-based Vortec engines wound up on almost every branch of the GM …For example – on the Subaru EJ253 2.5L naturally aspirated engine, a torque specification for a single bolt is to tighten to 22 ft./lbs., then 51 ft./lbs., loosen 180 degrees, then loosen another 180 degrees, torque to 31 ft./lbs., turn an additional 80-90 degrees, all bolts another 40-45 degrees, and finally the center bolts another 40-45 degrees.Add to Cart. ARP HEAD BOLT KIT - 04+ LS ENGINES - 134-3610. The Pro series cylinder head bolts from ARP are cold-forged to ensure molecular integrity. They are heat-treated prior to thread rolling and machining, and are rated at a whopping 190,000 psi. The Pro series are also available with hex and 12-point heads.Jun 10, 2016 · Head bolt torque sequence, however, generally remains constant for a given engine. To give you a quick reference of torque sequences, OnAllCylinders’ Lori Sams has created a series of infographics for different engine makes. Today, we’ll look at cylinder head torque sequences for General Motors L8 and V8 engines. Sep 5, 2012 · I believe ARP's torque specs also takes into consideration that ARP moly lube is used on the head bolts; using motor oil would require a different amount of torque. That is correct. ARP's torque spec is based off 75% of the fastener yield strength. If you are using ARP's bolt lube, the recommended value is 75 lb/ft. Today I installed and torqued down my LS1 cinder heads for my ls swapped is300 projectChevrolet Orange Engine Painthttps://amzn.to/3hIh21DICT Billet Exhaust ...Cylinder Head Bolts (Final Pass M11 Medium Length Bolts at the Front and Rear of Each Cylinder Head in Sequence) 50 degrees. Cylinder Head Bolts (M8 Inner Bolts in Sequence) 22 lb ft. Engine Flywheel Bolts 74 lb ft. Engine Flywheel-to-Torque Converter Bolts 44 lb ft. Engine Front Cover Bolts 18 lb ft.In some cases the stretching approaches the bolts’ elastic limit, permanently stretching them. Reusing stretched T-T-Y head bolts can cause improper or uneven torque, damaged engine threads, and broken bolts, any of which could lead to head gasket failure. It is important to use new bolts and proper torquing procedures during reassembly.Find the torque specifications for various engine parts and bolts of LS engines. Learn how to tighten the cylinder head bolts in sequence and the recommended torque values for each bolt. Thank you Headflowinc for pointing out the correct Mahle head gaskets I needed for this build. I could have used the others I bought but I fear the larger fi... Object moved to here. Cylinder Head Bolts, High Performance Series, Hex Head, ARP 2000, Black Oxide, Same Length Bolts, Includes Washers and Lube, Chevy, LS, Kit. Part Number: ARP-234-3602 5.0 out of 5 stars When it comes to fastening two objects together, using the correct amount of torque is crucial. A bolt torque table is a valuable tool that provides the recommended torque values f...To properly torque the head bolts on the 2008 Chevy 5.3 engine, follow these steps: 1. Start by cleaning the threads of the head bolts and the bolt holes in the engine block to ensure proper engagement. 2. Apply a small amount of … The oil pump assembly should be tightened down to the engine block using 18 ft-lbs. The pumps cover bolts can be installed after lubing up the oil pump gear. The oil pump cover bolts torque down to 8 ft-lbs. On the bottom end of the pump the pickup tube can be installed and torqued down to the pump using 8 ft-lbs. What is the Torque Specs for Ls Head Bolts? When it comes to LS head bolts, the torque specs can vary depending on the application. For most applications, the general rule of thumb is that you should torque your LS head bolts in three stages: first at 30 ft-lbs., then at 45 ft-lbs., and finally to a final torque value of 70 ft-lbs..It’s always best …Steps to Torque LS Head Bolts. To properly torque the head bolts on an LS engine, follow these steps: 1. Start by cleaning the threads of the head bolts and the corresponding holes in the engine block. This ensures proper lubrication and prevents any debris from interfering with the torque process. 2.Head Bolt Kit Chevrolet LS Gen III LS Series small block (2004 & later - except LS9) w/ all same length bolts, 8740, hex Kit #: 134-3610 . Specifications; Socket Size(s) 10mm hex, 13mm hex: Jobber Price*: $189.13. Instructions for Kits with Standard Flat Washers ...The machine shop that did my heads recommended straight non-detergent 30w oil. However, having ready Gerry's thread about how he broke an ARP bolt using 30w as lube I opted to locate some ARP assembly lube. I spread a little bit under the head bolts, washers and a tiny bit on the threads as the instructions said and had no issues with …Jun 16, 2019 · As the Trailblazer SS LSA project moves forward , New CNC ported LS3 heads and American racing headers were installed. Terry goes thru the torque specs and b... Part Number: 134-3610 & 134-3710 Application: Chevy Gen III LS Series (2004 & later) 8740. Inspect all hardware prior to installation. Look for obvious defects or shipping damages. Please call 800-826-3045 with any questions or issues. To ensure proper thread engagement and accurate torque readings, clean all threads in the block. Applying the correct tightening values for threaded engine fasteners is critical for any engine build. Listed here are both factory OEM values, some of which involve a torque-plus-angle tightening method, and OEM and aftermarket values which require only a tightening-by-torque (or by monitoring rod bolt stretch) approach. Clean the deck surface of the head with a clean rag and acetone (or a similar cleaner). Gently set the cylinder head on top of the head gasket. Be sure it sits properly on the dowels. Take care not to nick or scratch the deck surface of the head. Install all the bolts finger-tight. Torque the M11 bolts (#1-10) in 3 passes.The 5.3 liter LS-series engine was offered from 1999-2014 and has a 3.78” bore x 3.62” stroke. The block was offered in both cast-iron and aluminum with aluminum cylinder heads. Camshaft specifications varied depending on the year and RPO code of the engine.No, it is not close, it is the same. The torque/angle method is just that-a method of tightening the bolt. TTY (torque-to-yield) is the type of bolt (meant to be used with the torque/angle method of tightening). When there are better bolts out there to be had (ex. ARP, that say they can be reused numerous times) and threads of people breaking …Head Bolt Kit: 234-3602: Chevrolet LS Gen III LS Series small block (2003 & earlier), two lengths, ARP2000, hex: Head Bolt Kit: 234-3601: Chevrolet LSA, 8740, hex: Head Bolt Kit: 134-3613: Chevrolet LSA, 8740, 12pt: Head Bolt Kit: 134-3713: World - 9.240 deck - Warhawk aluminum block w/ Warhawk 12° LS7 heads:The oil pump assembly should be tightened down to the engine block using 18 ft-lbs. The pumps cover bolts can be installed after lubing up the oil pump gear. The oil pump cover bolts torque down to 8 ft-lbs. On the bottom end of the pump the pickup tube can be installed and torqued down to the pump using 8 ft-lbs.Cylinder Head Bolts (Final Pass M11 Medium Length Bolts at the Front and Rear of Each Cylinder Head in Sequence) 50 degrees. Cylinder Head Bolts (M8 Inner Bolts in Sequence) 22 lb ft. Engine Flywheel Bolts 74 lb ft. Engine Flywheel-to-Torque Converter Bolts 44 lb ft. Engine Front Cover Bolts 18 lb ft.3. Pewter. 2002 Z28. In case you can't get the torque wrench on the bolts (most likely scenario lol), just use a 3/8" drive ratchet or maybe even an 1/8" drive, or a box wrench, and be careful not to make them too tight. 18 ft/lb is not much force and you're going into soft aluminum. No strippy!LS1 Head bolt torque settings Hi all, Has anyone got a list of the torque specs for the head bolts on an 2004 LS1? I have my bolts, gaskets and all new shiny bits ready to go but can't for the life of me find anything about the torque settings. Thanks in advance Gav 05-31-2008, 09:37 PM #2. 0rion ...LS1 how to has it as 22 ft lbs then 90 degrees then 1-8 90 degrees and 9&10 50 degrees for final pass. I found a thread with Helms info and it says Cylinder Head Bolts (All M11) (1st pass in Seq.) = 22 Cylinder Head Bolts (All M11) (2nd pass in Seq.) = 90 degrees Cylinder Head Bolts (All M11 EXLUDING Med. Length F/R Bolts)Enter your kit number in the field below and click “Submit.”. Important: if you have an aftermarket connecting rod with an ARP bolt, please use the chart below to contact the rod manufacturer for the stretch/torque value. The calculation of those values is solely up to the rod manufacturer. click here to contact our customer service desk.)LS7 Torque Specs - Pace PerformanceThe Gen 4 5.3 torque specs are as follows: Main cap bolts – 75 ft-lbs; Connecting Rod Bolts – 18 ft-lbs; Cylinder head bolts (1st pass) – 25 ft-lbs, (2nd pass) – 50 ft-lbs + 90° rotation; Camshaft sprocket bolt – 34 ft-lbs + 180° rotation. Other specifications include the following: Intake manifold bolts/studs – 10 mm = 22 in-lb ...Ok I have a 2007 LQ4 that im gona be reinstalling the heads on saturday, i saw the right up on ls1howto.com but was wanting to make sure that sequence and those specs are also correct for my engine? Thanks, Chad. 2006 extended cab, 6.0 swap, full bolt ons SOLD. 2011 ECSB, 6.2, 6 spd, 3.73, 5" lift, 33" nitto, limo tint, debadged, volant CAI ...333. black. 02 ss camaro. 15 mm bolts first pass torque of 22 ft/lbs. 2nd pass of 90 degrees on the 15 mm bolts. 3rd pass of 90 on the 15's except fot the 2 on the outside of the head under the valve cover...only 50 degrees on the 3rd pass for those 2 bolts. Then torque the 10 mm bolts to 22 ft/lbs.The amount of torque applied to the head bolt accomplishes two things. First, it overcomes friction between the threads in the block and the bolt as well as friction between the cylinder head the underside of the bolt head. Secondly, the torque stretches the fastener slightly to establish and maintain the desired clamp load on the gasket.The oil pump assembly should be tightened down to the engine block using 18 ft-lbs. The pumps cover bolts can be installed after lubing up the oil pump gear. The oil pump cover bolts torque down to 8 ft-lbs. On the bottom end of the pump the pickup tube can be installed and torqued down to the pump using 8 ft-lbs.Cylinder Head Bolts (Final Pass M11 Medium Length Bolts at the Front and Rear of Each Cylinder Head in Sequence) 50 degrees: Cylinder Head Bolts (M8 Inner Bolts in …The oil pump assembly should be tightened down to the engine block using 18 ft-lbs. The pumps cover bolts can be installed after lubing up the oil pump gear. The oil pump cover bolts torque down to 8 ft-lbs. On the bottom end of the pump the pickup tube can be installed and torqued down to the pump using 8 ft-lbs.These heads bolt right on to any 3.90-inch-or-larger bore and come fully assembled for $1,350. Edelbrock LS1/LS2, E-CNC 215. These 50-state-legal heads are fully CNC-ported, and a nice upgrade over stock LS1, LS6, or LS2 heads. The cost is kept down, but the quality is kept up.Object moved to here.When it comes to optimizing the performance of your Kohler engine, one crucial factor that cannot be overlooked is the torque specifications. Torque specs refer to the specific amo...Cylinder Head Bolts, High Performance Series, Hex Head, ARP 2000, Black Oxide, Same Length Bolts, Includes Washers and Lube, Chevy, LS, Kit. Part Number: ARP-234-3602 5.0 out of 5 stars Head Bolt Kit: 134-3710: Chevrolet LSA, ARP2000, 12pt: Head Bolt Kit: 234-3726: Chevrolet LS Gen III LS Series small block (2004 & later - except LS9) w/ all same length bolts, ARP2000, 12pt: Head Bolt Kit: 234-3725: Chevrolet LS Gen III LS Series small block (2003 & earlier), two lengths, ARP2000, 12pt: Head Bolt Kit: 234-3724: Chevrolet LSA ... 06-27-2013, 06:34 AM #1. konigandy6. Your dealership guy. Join Date. Aug 2007. Location. USA. Posts. 6,565. Velocity Yellow. 2008 Corvette Z06. Torque specs for LS1 motors. …When it comes to fastening two objects together, using the correct amount of torque is crucial. A bolt torque table is a valuable tool that provides the recommended torque values f...
The 5.3 liter LS-series engine was offered from 1999-2014 and has a 3.78” bore x 3.62” stroke. The block was offered in both cast-iron and aluminum with aluminum cylinder heads. Camshaft specifications varied depending on the year and RPO code of the engine.. 99 cent store vallejo california
This particular block is the 2/2004 & later style that requires (10) 4" medium head bolts for each cylinder head. This cylinder block does not use 6" long bolts as required for the early style block. Head Bolt Torque (for OEM head bolts only, if using performance bolts/studs refer to the manufacturer’s specifications): refer to the diagram ...Object moved to here.1. Make sure all the head bolts are in perfect condition with clean, undamaged threads. Dirty or damaged threads can give false torque readings as well as decrease a bolt’s clamping force by as much as 50%! Wire brush all bolt threads, carefully inspect each one, and replace any that are nicked, deformed or worn. If a bolt doesn’t …Let’s use the example of tightening a head bolt. The amount of torque applied to the fastener is proportional to how much load we want to apply to the head gasket to ensure that it seals. The amount of torque applied to the head bolt accomplishes two things. ... GM LS engine head bolts, for example, are TTY fasteners that can only be …5.3 LS Head Bolt Torque Specs. To ensure the proper installation and sealing of the cylinder head on the 5.3 LS engine, it is important to follow the recommended torque specifications for the head bolts. The torque specifications are given in both foot-pounds (ft. lbs.) and Newton meters (Nm). Refer to the table below for the specific torque ...457. 31K views 4 years ago #torquespec #coverman66. As the Trailblazer SS LSA project moves forward , New CNC ported LS3 heads and American racing …Procedure: Follow these steps to correctly torque the head bolts on your 5.3 engine: 1. Begin by tightening all head bolts in sequence to 22 ft. lbs. (30 Nm) using a torque wrench. 2. Once all bolts have been tightened to the initial torque, go through the sequence again and tighten them to 45 ft. lbs. (61 Nm). 3.Let’s use the example of tightening a head bolt. The amount of torque applied to the fastener is proportional to how much load we want to apply to the head gasket to ensure that it seals. The amount of torque applied to the head bolt accomplishes two things. ... GM LS engine head bolts, for example, are TTY fasteners that can only be …Procedure: Follow these steps to correctly torque the head bolts on your 5.3 engine: 1. Begin by tightening all head bolts in sequence to 22 ft. lbs. (30 Nm) using a torque wrench. 2. Once all bolts have been tightened to the initial torque, go through the sequence again and tighten them to 45 ft. lbs. (61 Nm). 3.May 6, 2020 · 10. Tighten the cylinder head bolts. 10.1. Tighten the M11 cylinder head bolts a first pass in sequence to 30 N.m (22 lb ft). 10.2. Tighten the M11 cylinder head bolts a second pass in sequence to 90 degrees. 10.3. Tighten the M11 cylinder head bolts (1-8) to 90 degrees and the M11 cylinder head bolts (9 and 10) to 50 degrees a final pass in ... A21BRAVO MERCH PAGE - https://teespring.com/stores/a21bravoJoin Me On Facebook - https://www.facebook.com/groups/193038048240318/Have Kids? Check Out My Othe...As the Trailblazer SS LSA project moves forward , New CNC ported LS3 heads and American racing headers were installed. Terry goes thru the torque specs and b...When working with the cylinder heads of your 4.8L Chevy engine, the cylinder head bolts and gaskets are at the forefront. The bolts range in size from 3.94 inches to 6.1 inches. If replacing the cylinder head bolts, tighten the new bolts with 30 N-m, or 22 lb-ft of torque. Begin with the center bolt, then continue on from the outside inwards.Bolts are rated at 200,000 psi. For accurate torque readings and even load distribution, hardened and parallel-ground washers are included with each kit. Pro Series head bolts have a reduced wrenching hex and a wide area flange. For 1997-2003 LS engines and some 2004 LS engines using "unequal length" bolts.To summarize and simplify the above information, the lifter tray bolt torque for LS1, LS2, LS7, LS9, and LSA engines is 108 in-lb or 8.3 ft-lb. The lifter tray bolt torque for the remaining LS2, LS3, and LS4 engines is 89 in-lb or 7.4 ft-lb. Also, you can tighten the lifter trays in any sequence you like, and one pass with the correct torque ....