402 advice needed......
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402 advice needed...... I'm looking at replacing my LS1 with an LS2 402 with -2cc pistons. I have AFR205 heads milled to 61cc right now, what compression ratio am I looking at if I use my old heads on the 402 strocker and will it be to high? Thanks
Assuming the pistons are .008 out of the hole and you're using GM MLS gaskets at .052-.054 compressed thickess, you're looking at somewhere around ~12.5:1. I certainly wouldn't run that high of SCR unless you plan on using race gas. Upper 11's is the highest I'd run on the street with 93 octane and even that might be pushing it depending how hot it gets where you live and how good your tuner is.
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Originally Posted by ArcticZ28
Assuming the pistons are .008 out of the hole and you're using GM MLS gaskets at .052-.054 compressed thickess, you're looking at somewhere around ~12.5:1. I certainly wouldn't run that high of SCR unless you plan on using race gas. Upper 11's is the highest I'd run on the street with 93 octane and even that might be pushing it depending how hot it gets where you live and how good your tuner is.
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Originally Posted by Demon SS
approx. 10.7:1 with a -14cc dish piston
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Originally Posted by MSGHUFF
I'm looking at replacing my LS1 with an LS2 402 with -2cc pistons. I have AFR205 heads milled to 61cc right now, what compression ratio am I looking at if I use my old heads on the 402 strocker and will it be to high? Thanks
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Still have not decided on a cam but I'm looking for something that will perform like my 224/228 did on my 346. I will more than likely use a 402 with -14cc pistons, .045 cometic gaskets and my 61cc AFR 205's. I have already ordered a fast 90 that I will have ported and will likely go with 42lbs SVO injectors. I want an all around street car that will see the track every other weekend drivability is important. Any opinions would be apriciated
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Originally Posted by See5
I used -12 Mahle pistons with 61cc heads. The Mahles are .010 out so it comes out to 11.3 which nice quench using .045 gaskets. Like you, I wanted to keep my heads.
Ask PatrickG, he is good at figuring the DCR with the cam and he can tell you how to get as close as possible to the magic 8.5 to 8.8 desired DCR for pump gas (depending on octane available).