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Ryridesmotox · 02-07-2015, 10:56 PM

Just as a comparison.... Ls7 valves are 2.20, LS3 types are 2.165 and cathedral ports are 2.00. Doesn't seem like a lot, but it's part of the reason that rectangular port heads can't be used on a smaller than 4.00 bore block.

Just as a reference... GM makes a mini ls3 style head for a "small bore" LS1/6 block... It still uses the 2.00 valves

http://www.jegs.com/webapp/wcs/store...1&pgGrp=catNav

02-07-2015, 10:56 PM	#29
Ryridesmotox Senior Member Join Date: Nov 2010 Posts: 510 Tweet	Just as a comparison.... Ls7 valves are 2.20, LS3 types are 2.165 and cathedral ports are 2.00. Doesn't seem like a lot, but it's part of the reason that rectangular port heads can't be used on a smaller than 4.00 bore block. Just as a reference... GM makes a mini ls3 style head for a "small bore" LS1/6 block... It still uses the 2.00 valves http://www.jegs.com/webapp/wcs/store...1&pgGrp=catNav __________________ The Tow Pig: 2013 Silverado 1500 crew cab The Race Car lol: 2004 Cadillac CTS-V... With things. Better to be judged by 12 than to be carried by 6.