[HWYSTR455]

Originally Posted by grivera

I’m surprised your iron-headed engines didn’t like the usual 34-36 degrees. What compression?

The last iron head one I believe was 9.98 SCR, typical large valve small chamber heads, think they were 16s, but would have to check.

Usually, the aluminum heads like a little more, in the 34-36 range, but my 461 round port e-heads (10.68 SCR I think) still ran best at 32. I did try 34-36 with it, and even tried a bunch of diff heat range plugs, but it still ran best overall at 32.

I'm running my 535 with 340cfm round port E-heads at 34 right now, but I see no diff between 32-36 with it. I think it's at 10.35 SCR, so it would make sense it wants more, but haven't found that to be true. I am still in the tuning phase on it though.



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