[grivera]

Originally Posted by HWYSTR455

As an example, I ran 16 initial, 8 vacuum, 32 total mechanical, and my engines loved it.

I ran that exact setup on several diff engine combos and it was a baseline for all builds going forward from a certain timeframe, roughly starting in the 90s. Both iron and aluminum head builds.



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

[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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[HWYSTR455]

My 535 cranks at 16 degrees, and have idle set to 24, so very similar to previous engines for me.


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[scott70]

Originally Posted by HWYSTR455

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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Same here,,, I’ve run round port E heads,, probably 4 different numbered iron heads with solid roller to hydraulic flat tapper and they all liked no more than 34 total,,, most on the Dino liked an average of 32. I played with them at the track also and ran the best times around 32. I’d advance it to 34 or 36 but they wouldn’t go any faster.