INTERNAL ENGINE MODIFICATIONS Valvetrain |Heads | Strokers | Design | Assembly

Shaving heads?

Old Feb 28, 2008 | 05:55 PM
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sv650lex's Avatar
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Default Shaving heads?

I'm just bored and thinking here, what kind of hp gains could be expected from just shaving down factory 5.3 heads? Also how high can the compression ratio be and still run 87? 93?
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Old Feb 29, 2008 | 10:24 AM
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Generally you get 10% for every full point of compression increase.

As for your question on gas vs compression limits, it really comes down to camshaft choice and how well you can tune to limit detonation.
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Old Feb 29, 2008 | 11:18 AM
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If you mill them at all, I would run premium gas; either 91 or 93 octane depending on where you live.
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Old Mar 1, 2008 | 01:20 PM
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yea its around 10hp if you come up 1 on compression, maybe a little more, i was gona mill mine but im just gona save and buy some real heads!
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