Now staying practical, would it make much of a difference if anyone knows to have the heads milled? I have the V6 but i want to gain all around performance with out sacrificing much driveability.

I know that this will obviously increase compression and make for higher test gas but if our cars only ask for 91 now then maybe we can mill the heads slightly to where it needs 92 or 93.

As far as that goes that would effect me nearly none because i already put 92 or 93 in the tank. and can that XCAL thing cover that.

I dont want to boost if i dont have to so this is another reason i ask.

No comments?

I wouldn't advise it. Doing that has the potential of bringing you up to about 11:1 compression. 93 Octane just isn't enough to prevent detonation. 2 octane points just isn't enough. You could have port and polish work done...

Thats what Ive been wondering. Has any one ported and polished a LS?

Quick LS posted he had some worked heads, but never heard who/what/how much about it.

they have kits out there to PnP your heads and intake yourself. Its not the best, but its easy enough to do with a dremmel and some patience. The issue with PnP is to really know what your getting you need to flow test and a CNC will destroy you and your dremel when it comes to high quality work. It's worth a shot tho! Thats or find a shop to do a custom PnP for ya

You can always pick up gains with head work, after all its the tightest point that the a/f charge sees before it enters the combustion chamber. You have to be careful tho, these engines are very tight anyway, milling/decking the head to raise compression might put you in interferance with the piston, the crush point is really close anyway. However you must also be careful with porting and polishing anyway, dont get me wrong a good port job works wonders, however the idea isnt to go as big and super smooth as you can, it will throw off your ve and make for poor cylinder turbulance, ie actually move you powerband so high you wont ever get to it with stock cams, for a decent street port, just put a factory gasket up to the heads and cut off the metal you can still see with the gasket in place, not too extreme for factory cams but much better than factory flow!

With the right software you can tune a car to run just fine on 92 up to 12:1 CR. Porting and polishing and all that is just fine and dandy but at what point do you just get a V8 LS? For the amount of time and money you would invest in that 6 you could have sold the car and got a v8 car with good stock power. Also who knows what problem lie ahead of you after you reassemble the 6.

they have kits out there to PnP your heads and intake yourself. Its not the best, but its easy enough to do with a dremmel and some patience. The issue with PnP is to really know what your getting you need to flow test and a CNC will destroy you and your dremel when it comes to high quality work. It's worth a shot tho! Thats or find a shop to do a custom PnP for ya

I thought you just had to pour sand into the intake.

NO NO NO!!! Let's not go down that road again. lol

Now staying practical, would it make much of a difference if anyone knows to have the heads milled? I have the V6 but i want to gain all around performance with out sacrificing much driveability.

I know that this will obviously increase compression and make for higher test gas but if our cars only ask for 91 now then maybe we can mill the heads slightly to where it needs 92 or 93.

As far as that goes that would effect me nearly none because i already put 92 or 93 in the tank. and can that XCAL thing cover that.

I dont want to boost if i dont have to so this is another reason i ask.


It used to be that there was enough room for work on an iron head that careful, not-too-much work would do very well for you. With the casting processes available for alumimium and the factory search for the last available 'horse', improvement takes $100,000.00 worth of flow bench and Serdi machinery. It's NOT a do-it-yourself job.
KenS from Ben's Place