3800 what is milling the heads down supposed to

[LP 3800]

Well I have them off I will probably toss it on the milling machines if it helps at all.
And would you suggest the smaller MLS gaskets with milled heads or is that too much compression for a 2.6" pulley.
Thanks for your help

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[alexgtp]

Milling heads raises compression of an engine.

 

[LP 3800]

Is this agood way to gain HP?

 

[superchargedgp]

so was it a head gasket?

 

[alexgtp]

YEs

If you want to raise compression use thinner gaskets.
Remember shaving the heads is irreversible. And if you mess us a head you are out of luck in trying to re-deck them Because you have already milled them. Also higher compression means you will need to worry about premature detonation more. And in our cars that already bad for knock.

It will increase HP thruout the entire RPM range.

If you do have this done make sure you tune your car properly. Or you will possibly blow it up.

 

[12secGTP]

exactly what alex just said...
raising comp will increase HP however, a forced induction car does not like more comp but less (that is why the L36 has higher compression than the L67...)

IMO you hurting yourself more with the higher comp then you will get powerwise out of it.

if you do mill out the heads, I would go with the thicker gaskets to help equalize it out.

also IMO, I would not just slap heads on a milling machine and start chunking!! If you are off on the machine, you can end up with heads that are out of flatness...
I would leave milling heads up to an expert auto machine shop.

 

[gtphale]

Well since LP's shop does manifolds i'm pretty sure they will be able to handle this job.I say we do it after the century party.

 

[sr71_rgl]

Originally posted by LP 3800@Jan 9 2004, 12:36 PM
Well I have them off I will probably toss it on the milling machines if it helps at all.
And would you suggest the smaller MLS gaskets with milled heads or is that too much compression for a 2.6" pulley.
Thanks for your help

Yep...milling the heads will bump compression and HP but it's not the right way to go about it with a FI motor. It's best to use your power adder (SC/turbo) to raise the compression. I'm not saying it shouldn't be done, but only when a smaller pulley can't be added.

 

[LP 3800]

Thanks for the advice. I am getting some 9.5 to 1 pistons put in, so I think that will be enough compression already. But we will find out once the new IC gets built and installed

 

[imported_snoop]

DO NOT MILL THE HEADS. NO NO NO!!!!! dude, you will be more than happy with the compression up at 9.5:1, trust me. you do not need more. that is more than enough. with that compression and your IC, see where that takes you. you should be more than happy with it. test and tune baby.

 

[imported_Ron Vogel]

I'd agree with not milling the heads. It causes too much of a headache with milling the intake manifold to match. In some instances, it can help unshround the valves on open chamber heads to angle mill the decks, but our motors don't normally hit the revs to make such a modification practical. If you just mill them down to get a truer suface it should be ok.