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Engine Building, Hi Performance Please tell us about your engine builds. What component combos and horsepower output. Let's help each other build better faster engines. Ask or answer questions.

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Old 03-14-2017, 06:52 PM   #11
midnightrider
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This is also a very similar build to mine, except mine is a measured 11:1, with a solid roller by Bullet, @.050 254/264 .625 lift....no prob on 93 pump. 26* initial and 36* total. AFR 220 CNC ported...pulls like crazy, even down low.
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Old 03-14-2017, 06:56 PM   #12
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sounds like a lot of horse power for a 406. I run 10:1 with dual quads and estimate 425 horse power. reworked large valve double hump heads
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Old 03-14-2017, 07:50 PM   #13
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My guess is that narrow lobe separation (106 degrees) will let you get away w/ that much compression on pump gas. I doubt the heads have anything to do w/ it. Especially w/ today's gas the higher the compression the shorter the fuse.
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Old 03-15-2017, 07:53 AM   #14
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406 is a torque monster
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Old 03-15-2017, 10:42 AM   #15
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Default Chevy Engine Build 406ci, 581 hp

I doubt the heads have anything to do w/ it.

??? Heads have everything to do with power. That is why the LS stuff is such easy horsepower. Maybe I am misunderstood this.
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Old 03-15-2017, 07:58 PM   #16
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Agreed jt56...my 220's are as important a component as any in my build.
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Old 03-15-2017, 08:47 PM   #17
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You guys need to re-read my post. Of course heads have a huge influence on power. The issue at hand was: will an 11.5:1 engine survive w/ 91 octane gas?
The tightness of the lobe centers will mean the intake valve will stay open a few degrees after the completion of the intake stroke......this will reduce some of the cylinder pressure thus "forgiving" the low octane. I don't think the AFR heads themselves are going to prevent detonation.....squeeze is squeeze.
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Old 03-16-2017, 07:12 AM   #18
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FRIEND RUNS 11:1 COMPRESSION WITH DART ALUMINUM HEADS ON SBC AND NEEDS TO SPIKE PREMIUM FUEL WITH RACE GAS. NOT SURE WHAT MIX HE USES
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Old 03-20-2017, 12:48 PM   #19
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Detonation is base on cylinder pressure, but the piston/chamber design has a huge amount to do with it.
Steel heads, older factory chamber designs, dome pistons and too much quench are a recipe for detonation.

It must all work together to be efficient.

Nice 406 build you have there!
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