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Old 04-14-2008, 01:25 AM   #1
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simple question about heads.

I read a lot of guys doing valve spring jobs during cam swaps. They say its easier to remove the heads to accomplish this. I agree, probably is. BUT, when removing heads after being ran for a while, isnt it a good idea to have the checked for straightness, prior to re-installing them again? I have a mechanic bud that will NOT put a removed/used head back on an engine without having it checked for warpage 1st. Is this overkill? Or if you know FOR SURE that you have not overheated your engine, is there any real concern?

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Old 04-14-2008, 01:42 AM   #2
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simple question about heads.

If the heads are coming off anyway I'd do as much to them as I could before they went back on. I call it cheap insurance.
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Old 04-14-2008, 08:56 AM   #3
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simple question about heads.

Quote:
quote:Is this overkill?
Quote:
quote:Is this overkill? Or if you know FOR SURE that you have not overheated your engine, is there any real concern?
Chances are far in yer favor, nothing is wrong, but I think it is a good idea to be sure. It's also a good idea to let the motor cool all the way down, before pulling heads.
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Old 04-14-2008, 09:48 AM   #4
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simple question about heads.

it's also a great time to mill the heads down 20 thousandths to gain a little compression, and I believe the stock pushrods will now work a little better with an aftermarket cam.
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Old 04-14-2008, 09:59 AM   #5
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simple question about heads.

I always resurface heads once they have been run a while, just my personal preference, not many will touch heads without resurfacing, the only thing just make sure that whoever does it has good machines and rep, some shops will do it and put a washboard in it! Been there with one of my race motors, 20thous off the heads will bump compression a tad bit, nothing wrong with that!
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Old 04-15-2008, 10:27 AM   #6
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simple question about heads.

Quote:
quote:20thous off the heads will bump compression a tad bit, nothing wrong with that
Why stop there? why not take it on up to 10:1, or 10.5:1? and do a little porting/gasket matching to boot. If the heads are off.... why not go for it.

Thanks, that's pretty much what i expected to hear.
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Old 04-15-2008, 12:02 PM   #7
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simple question about heads.

Quote:
quote:Why stop there? why not take it on up to 10:1, or 10.5:1?
The deck would be to thin.
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Old 04-15-2008, 12:40 PM   #8
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simple question about heads.

.020" takes the CR to 10.1:1, I had my head's CC'd before and after You could probaly go .030" but it might cause somw quench problems.
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Old 04-15-2008, 12:54 PM   #9
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simple question about heads.

The stock chamber size was 85cc's, and after .020" off they were 80.4 cc's.
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Old 04-15-2008, 01:00 PM   #10
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simple question about heads.

Aslo, why not port and polish? Or why your at it just bore and stroke the whole motor.
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