LS1 Pistons Ross Racing Pistons LS1 Stroker Piston Kits

ROSS Chevy LS1 Pistons are used in high performance, street car, muscle car, hot rod, street rod and Chevrolet LS series racing engines by knowledgeable engine builders the world over. They combine light weight, high strength, precision machining and premium materials to build a superior forged LS1 piston set you can depend on for high horsepower, torque, efficiency and reliability.

ROSS Chevy LS1 pistons include forced pin oilers and double spirolox on all of their stocking part number sets. Each part is selected and boxed to provide you a matched set that is balanced to within plus or minus 2.5 grams. The valve intake and exhaust pockets are designed to handle most common camshaft applications. The skirt design allows for operation under intense heat and tremendous side loads without scuffing or splitting the cylinder walls. Most normally aspirated pistons are designed to run with approximately .004 skirt to wall clearance.

Ross Forged Chevy LS1 Pistons

All of the sets listed below feature:

• Forged from 2618-T61 Aluminum for ultimate strength and fatigue resistance
• Wrist pins and pin fitting included
• Accumulator groove included
• Double pin oilers are force fed from the oil ring
• Large valve relief depths and diameters allow for high lift cams and oversized valves
• Piston sets are weight matched
• Pin lock removal grooves included to ease lock ring removal
• Fully CNC Machined
• Double spiral locks or wire locks included
• Piston ring set is included

Ross Chevrolet LS Series Stock Stroke and Stroker Pistons   Stock LS1 LS6 bore size is 3.898 | LS2 is 4.000 | LS7 is 4.125 Stock LS2 LS2 LS6 crankshaft stroke is 3.622 | Stock LS7 Stroke is 4.000 Block Height 9.240" Stock Rod Length is 6.098 for LS1 LS2 LS6 | Stock LS7 Rod Length is 6.077 Stock LS1 LS2 LS7 piston pin size is .945 | Stock LS7 pin size is .9252 Most of these pistons are for use with aftermarket rod lengths of 6.125 with a .927 pin Ring grooves are 1.5mm, 1.5mm, 3mm Compression based on .050 piston to head clearance (deck and gasket combined) The 4.000" stroker crankshaft with a 3.905 bore = 383 cubic inches The 4.000" stroker crankshaft with a 4.125 bore = 427 cubic inches The 4.000" stroker crankshaft with a 4.155 bore = 434 cubic inches FT = Flat Top RD=Reverse Dome Top CH = Compression Height This is the measurement from the centerline of the piston pin bore to the top flat part of the piston Wt= Piston weight in grams
Bore Size	Crank Stroke	Rod Length	Pin Size	CH	Wt. in grams	ccs	type	Compression with 64cc head	Part #
3.905	3.622	6.125	.927	1.299	435	-15.8	RD	9.0-1 can be used with forced induction	ross 99840 $944.30 $774.33  + DISCOUNTED SHIPPING! Shipping in the USA for this item is only $34.95 when you spend $600.00 or more!
3.905	3.622	6.098	.945	1.326	422	-4.0	FT	10.0-1	ross 99838 $944.30 $774.33  + DISCOUNTED SHIPPING! Shipping in the USA for this item is only $34.95 when you spend $600.00 or more!
3.905	3.622	6.125	.927	1.299	402	-4.0	FT	10.7-1	ross 99839 $944.30 $774.33  + DISCOUNTED SHIPPING! Shipping in the USA for this item is only $34.95 when you spend $600.00 or more!
3.905	4.000	6.125	.927	1.110	375	-9.0	RD	10.7-1	ross 99837 Discontinued
4.125	4.000	6.125	.927	1.110	461	-2.6	FT		ross 99171 $1013.52 $831.09  + DISCOUNTED SHIPPING! Shipping in the USA for this item is only $34.95 when you spend $600.00 or more!
4.125	4.000	6.125	.927	1.110	445	-35	RD	8.8-1 can be used with forced induction	ross 99173 $1013.52 $831.09  + DISCOUNTED SHIPPING! Shipping in the USA for this item is only $34.95 when you spend $600.00 or more!
4.155	4.000	6.125	.927	1.110	467	-2.6	FT		ross 99172 $1013.52 $831.09  + DISCOUNTED SHIPPING! Shipping in the USA for this item is only $34.95 when you spend $600.00 or more!
4.155	4.000	6.125	.927	1.110	429	-36.5	RD	8.8-1 can be used with forced induction	ross 99174 $1013.52 $831.09  + DISCOUNTED SHIPPING! Shipping in the USA for this item is only $34.95 when you spend $600.00 or more!
If you do not find what you want listed here, we also sell CP Pistons brand forged LS1 LS2 LS7 Dish Top Pistons and LS Series Flat Top Pistons

Please feel free to use our compression ratio calculator

If you do not see the exact piston specs you want in the above list we offer parts from many other top quality manufacturers. If  no shelf stocking type sets are available we will be happy to help you with a custom LS1 piston. Custom sets can be made to your exact requirements. Please e-mail us and we will be happy to assist you with a custom order. We offer discounted pricing, even on custom pistons so please contact us and we will be happy to help.

Links to related performance parts sections of our website:

• K1 Technologies LS1 Connecting Rods
• Ross Racing Pistons Catalog Index
• Wiseco Pistons Index
• CP Pistons Index Page