more 383 build questions...
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
You also made a mistake in the stroke length.
If you're building a 355, the stroke is 3.48. You typed 3.75 -- which is for a 383.
I built a 383 with zero deck and .040 quench (e.g., .040" cometic head gaskets) Using the Kelley calculator, The SCR is about 10.25 with 8.25 DCR (my cam is similar to the LPE219 though a bit smaller. I used 20cc inverted domes with 58cc chambers.
With 64cc chambers, zero deck, and .040 quench, a 350 (355) can run flatter pistons (something around 5cc reliefs). Under this scenario, you'd have 10.36:1 SCR with 8.1 DCR. This is completely doable and probably what you'll find most people will recommend.
4cc reliefs are also fine.
If you deck it less, use a thinner gasket. Try to keep .040ish quench.
Really, you'd have to mill the (64cc) AFR heads (using flat-tops) to get too much compression on a 350 build.
If you're building a 355, the stroke is 3.48. You typed 3.75 -- which is for a 383.
I built a 383 with zero deck and .040 quench (e.g., .040" cometic head gaskets) Using the Kelley calculator, The SCR is about 10.25 with 8.25 DCR (my cam is similar to the LPE219 though a bit smaller. I used 20cc inverted domes with 58cc chambers.
With 64cc chambers, zero deck, and .040 quench, a 350 (355) can run flatter pistons (something around 5cc reliefs). Under this scenario, you'd have 10.36:1 SCR with 8.1 DCR. This is completely doable and probably what you'll find most people will recommend.
4cc reliefs are also fine.
If you deck it less, use a thinner gasket. Try to keep .040ish quench.
Really, you'd have to mill the (64cc) AFR heads (using flat-tops) to get too much compression on a 350 build.
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
BTW...you probably found it, but here's the LPE219 SR cam specs...
http://www.lingenfelter.com/sites/li...mationv1.3.pdf
Also, when using the calculator, fill in tab 2 (cam specs) first. That provides cam closing for tab 1.
If you redo the specs with an advanced cam installation (e.g., 108ICL or 4-deg adv on the timing set), your compression will go up. The comments in the post above related to a SR cam installed at 112ICL. (straight up).
http://www.lingenfelter.com/sites/li...mationv1.3.pdf
Also, when using the calculator, fill in tab 2 (cam specs) first. That provides cam closing for tab 1.
If you redo the specs with an advanced cam installation (e.g., 108ICL or 4-deg adv on the timing set), your compression will go up. The comments in the post above related to a SR cam installed at 112ICL. (straight up).
