How Much can these heads be safely milled? I am wanting about 11.0 CR on a stock ,4.030 bored, 6.0. I am also thinking about MLS head gaskets. What thickness should these be? I figured milling is a cheap way to make power. and while some have said that My 706's will work on the 6.0... For like $50-$75 a head I can mill the 317's. But Can I get My 11.0 CR goal? And is this CR too high? I run 93 octane fuel.
I had my 853's milled .25, should bump me up around 11.5 11.2 to 1. Shouldnt be much of a problem on 93 octane either with a tune of course.
Last edited by Turbo_smh; 12-28-2008 at 12:02 AM.
1993 Gmc 02 ls1 Circle D 3400 stall, long tubes, 220/224 cam stage 3 heads, weiand intake, auburn posi, 389rwhp 352ft/lbs
I believe they are the lq4 pistons, just oversized .030... I plan on putting everything in the 6.0 from my 4.8. maybe some 1.75-1.85 rockers for a tad more lift on the cam...Originally Posted by Justin_Inc
Last edited by ff_jeff; 12-27-2008 at 11:42 PM.
Jeff I would be very careful with how much you get the heads milled down. Just as an example with the LS2. The piston comes .010 above the deck, the gasket is .051 thick which leaves .041 clearance before your piston is smacking you head. I don't know the thickness of the gaskets for the 6.0 but I would check. Oh by the way I have a crank at the shop if you still need one.. let me know
hells yeah bro!!! I need it. You the man!!! I almost bought one today from up near Philly.
That's why I was asking. I know the ls2 and the lq4 have different setups. But the only thing that should get smaller by milling is the combustion chamber right? I mean if the gasket and the piston is the same, and you bring the combustion chamber closer to the block... I was thinking that as long as the valves don't hit the pistons and the pistons don't go past the head gasket, all should be fine. But I'm not an expert... lol... I just want the Power per dollar to be as high as possible. Im probably way off on my thinking though.
Exactly the distance will not change unless you go with a thinner gasket. I was just stating how close everything is already. The only thing that you will need is a reluctor wheel for the crank. I think they are only 15.00 from the dealer. Plus I have a nice little tool that we can install the wheel with.
.040" is the max they can be taken down safely from what i've seen, what kind of pistons and what cam are you using with them? 11:1 or 11.5:1 will be fine with the cam you already have IMO
you get a 6.0? Jeff
Name: Mark,
God created turbo lag so nitrous trucks could have a chance.
http://www.ls1truck.com/forums/my-ga...tml#post274877
you need to know the pistons that are on the overbore
317s i wouldnt go anymore then .030 which would put you right about 66cc for the head
give you and idea a 64.5cc head on a LQ4 raises compression to 10.5
stock MLS gasket is .054
a 64.5cc head on a LQ9 would be 11.1 which has flat tops
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Like Quik said, mill them .030, let Jr. do some port n polish on the heads and let her rip. Having 10.5 to 1 is not a bad thing at all. The setup should take some timing and will love the juice. With those dished pistons your quench will be fine even with milling the heads.
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