Milled Heads = More Valve Lift ?
08-01-2003, 07:56 AM
#1
Milled Heads = More Valve Lift ? When I ordered my heads from Absolute Speed last year, I had him mill the heads .010 to "clean them up". By doing this, doesn't this give you a tad more valve lift.
Actually shouldn't it give you .010 more lift since the "top of the heads" are closer to the block?
I currently have a TR 224 114 lsa cam with stock length rods and Isky Springs with titanium retainers. This winter, I am going to do a cam swap to get a few more HP & TQ.
I am thinking of going with either a custom cam from Thunder Racing (230 228 .580 .575 114 lsa) or going with MTI's X1 cam (230 227 .591 .571 112 lsa) Too bad MTI doesn't offer the X1 cam with a 114 lsa, but I suppose I could have one made that way.
With these cams, will I have a problem with P/V clearance since my heads are milled .010?
What is the minimum P/V clearance for an LS1?
One last question, should I replace my current springs with new ones? I heard a rumor that if you go with a bigger cam, you should get new springs since the current ones build a memory effect with that cam. Any truth to that?
Bill
Actually shouldn't it give you .010 more lift since the "top of the heads" are closer to the block?
I currently have a TR 224 114 lsa cam with stock length rods and Isky Springs with titanium retainers. This winter, I am going to do a cam swap to get a few more HP & TQ.
I am thinking of going with either a custom cam from Thunder Racing (230 228 .580 .575 114 lsa) or going with MTI's X1 cam (230 227 .591 .571 112 lsa) Too bad MTI doesn't offer the X1 cam with a 114 lsa, but I suppose I could have one made that way.
With these cams, will I have a problem with P/V clearance since my heads are milled .010?
What is the minimum P/V clearance for an LS1?
One last question, should I replace my current springs with new ones? I heard a rumor that if you go with a bigger cam, you should get new springs since the current ones build a memory effect with that cam. Any truth to that?
Bill
08-01-2003, 09:31 AM
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Re: Milled Heads = More Valve Lift ? Valve lift does not increase. With milling, the valves will be closer to the piston tops though. Minimum P/V clearance for any motor should be no less than .090". You will have no probs at all on your setup.
08-04-2003, 10:09 AM
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Re: Milled Heads = More Valve Lift ? Yes, I had TEA stage 2 5.3's milled .010", and the F1 cam, which was a 230/226 .591/.569 grind. No clearance issues at all.
