408 or 402
usually the question between 402, and 408 is LS2 block or Iron block. with 6 cubic inches it really wont make that much difference, but if you have an iron block, then i would go 408 cause it is available.
Used? I'm going to bore my lq4 to a 402 or 408. I'm assuming that I can make ether or.
There is no advantage, but if you stick with the right bore you can get cheaper off the shelf pistons as opposed to custom ones.
There are many 4.000, 4.005 and 4.003 pistons readily available, so a 402, 403 and 408 are easily made. Tho I would at least do a light hone of the bore to a 4.006 just to clean it up.
My LQ9 block was clean enough that all it needed was a hone to 4.005", which provided me with a 402 inch motor with the stroker crank. I saw no reason to bore it to 4.030 when a simple hone would suffice. This left room for next time, though obviously I hope there doesn't need to be a next time! It also saved me a few bucks at the machine shop.
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Do an .005 cleanup hone if that is all it needs and you will be at 403ci There are a ton of shelf pistons available for the 4.005 bore and as stated you can get another rebuild out of it....
Edit: No combs.
Edit: No combs.
TECH Senior Member
Joined: Mar 2004
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From: BFE
My LQ9 block was clean enough that all it needed was a hone to 4.005", which provided me with a 402 inch motor with the stroker crank. I saw no reason to bore it to 4.030 when a simple hone would suffice. This left room for next time, though obviously I hope there doesn't need to be a next time! It also saved me a few bucks at the machine shop.
TECH Resident
Joined: Sep 2010
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From: Cartersville, Georgia
My LQ9 block was clean enough that all it needed was a hone to 4.005", which provided me with a 402 inch motor with the stroker crank. I saw no reason to bore it to 4.030 when a simple hone would suffice. This left room for next time, though obviously I hope there doesn't need to be a next time! It also saved me a few bucks at the machine shop.
By the way "combs_425", everyone did a great job setting you straight on a 402/408 stroker 6.0. For the most part, most build a 402 out of the aluminum block LS2 (4.020" max recommended bore) and a 408 out of the iron block Lq4/LQ9's.
