What should be done to these heads?
10-10-2004, 05:22 PM
#1
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What should be done to these heads? I've got some stage 2 6.0 317 heads sitting around that aren't going to get used because I'm gonna go with some stage 3 heads since I went ahead and got some other stuff I hadn't planned on getting. Anyway, I figured I mine as well give em to the old man. He's got a h/c C5 and a stock Z06. The C5 has no ***** IMO. I figured I'd help him beef it up a little. I got a 236/230 599/575 on a 112 brand new at a damn good cost. The actual specs on the cam are 237/230.5 599/575 on a 112.10. The 6.0 heads haven't been welded up or milled becuase they were goin on my car. My question is, can they be milled to get the compression up still using this cam or not? I'm not putting any more money into these heads because I gave them to him. Do they absolutely need to be welded? They have the 72cc chambers that are now probably closer to 73 or 74cc. Anyone have any input? I think on a stock 346, the compression would be about 9.3:1 correct? I don't think he wants to go slower. 
What can the comp. ratio get up to without welding and just milling?
What can the comp. ratio get up to without welding and just milling? 
10-10-2004, 05:37 PM
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Just in case it matters or anyone cares, here are the flow #'s:
.200 151.5 119.9
.300 218.3 168.4
.400 261.9 206.8
.500 292.7 219.8
.600 320.0 225.8
.200 151.5 119.9
.300 218.3 168.4
.400 261.9 206.8
.500 292.7 219.8
.600 320.0 225.8
Last edited by DramaFoYoMama; 10-10-2004 at 07:08 PM.
10-10-2004, 06:35 PM
#4
No way would I weld them. Not a good idea to do that to a finished set of heads that are already flowing that well. You can mill them, but the pistons will have to come out for fly cutting.
Or, leave the compression alone and put a blower on it.
Or, leave the compression alone and put a blower on it.
10-10-2004, 07:13 PM
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Originally Posted by Greg Good
No way would I weld them. Not a good idea to do that to a finished set of heads that are already flowing that well. You can mill them, but the pistons will have to come out for fly cutting.
Or, leave the compression alone and put a blower on it.
Or, leave the compression alone and put a blower on it.
What would milling them .015 bring the compression to? Would it be super tight with the p to v issues? I guess maybe he could have to bowls done and slap a blower on it.
10-10-2004, 07:36 PM
#6
Welding moves a head around quite a bit. It's best to do the welding on a 6.0 liter chamber before putting the seats in. That way the seat pockets are nice and round, and the seat has the correct amount of interference fit in the head. Otherwise, you would probably have problems with the seats moving, and the valve job not lasting very long. Now that the heads are done, I would not weld on them in the chamber.
You can mill them and fly cut the stock pistons, or better yet, pull the old pistons out and put in a domed set that'll give you the compression you want without milling the heads.
You can mill them and fly cut the stock pistons, or better yet, pull the old pistons out and put in a domed set that'll give you the compression you want without milling the heads.