400 bulid
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Posting Guru
Joined: Jul 2007
Posts: 1,355
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400 bulid
Hey guys im rebuilding my 351m into a 400. Im using stock heads with the exauhst a bit die grinded, also one of my heads is a 74.6 chambers and the other one a 75.6 cc. I have these heads milled 0.020. I bought tims 0 deck 9.5 scr over 30 over pistons. I used several scr calculators and all of them said i will be getting a scr of 10 to 1. I will be using a crane cam that ive been using in my 351m with 282 int and 290 ext with a bit over 0.500 lift.
will i be able to use this built on pump gas? I checked on edyno.com and got 7.99 to 1 dcr and it says good for 91 octane, but what do experience tell you ? anything recomended? thicker gaskets? or shall i leave it as is?
will i be able to use this built on pump gas? I checked on edyno.com and got 7.99 to 1 dcr and it says good for 91 octane, but what do experience tell you ? anything recomended? thicker gaskets? or shall i leave it as is?
Elder User
Joined: Sep 2003
Posts: 576
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I have the same pistons,my block and heads (stock) have been decked. I never did the math to see exactly what compression i'm getting, but i run 93 octane in it, and it's doing fine. My machinist actually warned me about the tmi pistons, saying the skirts on them were kind of flimsy, so you should really avoid anything that could lead to detonation with them, as a bad case could destroy the piston fairly easy.
