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Should I be concerned about Piston to Valve clearance if I mill heads .06 thousandths

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Old 04-12-2002 | 09:21 PM
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Default Should I be concerned about Piston to Valve clearance if I mill heads .06 thousandths

I want to increase compression from 10.1:1 to 11.1:1. I may add a .05 head gasket to increase to a total of 11.6:1. I appreciate your input if the head milling might cause clearance problems.

Paul
Old 04-12-2002 | 11:37 PM
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Default Re: Should I be concerned about Piston to Valve clearance if I mill heads .06 thousandths

When in doubt, ALWAYS check! This will save you alot of time and money down the road.

What cam will you be using?
Old 04-12-2002 | 11:42 PM
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Default Re: Should I be concerned about Piston to Valve clearance if I mill heads .06 thousandths

A .060 cut on the deck only can cause sealing problems with the intake. If you are going to take that much, you may have to angle mill the intake surface on the head to bring back in the triangulation of the intake-head height.
Old 04-13-2002 | 06:15 AM
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Default Re: Should I be concerned about Piston to Valve clearance if I mill heads .06 thousandths

.060" off deck is more than any of the reccomended amounts i have read about, i think you would compromise head gasket sealing with that deep a cut. yOUR ptv CLEARANCE would depend on cam size and installed location.
Old 04-13-2002 | 08:27 AM
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Default Re: Should I be concerned about Piston to Valve clearance if I mill heads .06 thousandths

wait.. did you mean 1).06 thousandths? or 2)6 thousandths, or 3).06 INCHES (60 thousandths) HUGE differences between each

1. wouldnt do anything
2. is hardly anything
3. is way too much.

to get above 11:1 i believe your only option is to use some 5.3l vortec heads.

<small>[ April 13, 2002, 08:30 AM: Message edited by: MIGHTYMOUSE ]</small>
Old 04-13-2002 | 11:11 AM
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Default Re: Should I be concerned about Piston to Valve clearance if I mill heads .06 thousandths

My advice.. Do not mill more than 15 thousandths.. Not going to see much more performance on our cars no matter what anybody tells you.. I know..
Old 04-13-2002 | 10:36 PM
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Default Re: Should I be concerned about Piston to Valve clearance if I mill heads .06 thousandths

Mine are milled .040 too. No problems here...
Old 04-14-2002 | 12:05 AM
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Default Re: Should I be concerned about Piston to Valve clearance if I mill heads .06 thousandths

I appreciate everyone's input. The cam I've got is 226/226. .560, 112 LSA. I specifically asked Rippie for an aggressive cam. I would consider similar to a TR224, and less aggressive than a Comp XE-R.
Old 04-14-2002 | 12:07 AM
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Default Re: Should I be concerned about Piston to Valve clearance if I mill heads .06 thousandths

I forgot that I meant .06 inches. My mistake in the subject line (doesn't appear that we can edit posts).
Old 04-14-2002 | 12:11 AM
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Default Re: Should I be concerned about Piston to Valve clearance if I mill heads .06 thousandths

Yes you will need to check P/V - and you will also have intake sealing problems. I would not mill more than 30 thou off.

Chris
Old 04-14-2002 | 12:41 AM
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Default Re: Should I be concerned about Piston to Valve clearance if I mill heads .06 thousandths

To get the compression ratio you desire you'll have to use 5.3L truck heads, they have a smaller combustion chamber.

Eric
Old 04-14-2002 | 12:48 AM
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Default Re: Should I be concerned about Piston to Valve clearance if I mill heads .06 thousandths

How will you know if you have intake sealing problems? My heads are milled 40 thou, how would I know if that's just a tad too much?




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