Head options, need input.
03-02-2003, 12:08 AM
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Head options, need input. Ok, i have a 99 SS with some totally jacked up heads, stripped bolts all over the place (ill never take it to that shop again).... Anyway, i just bought a set of used 01 heads complete. I plan on putting my springs and retainers on the new heads to handle my asa cam. I also plan on cleaning up the heads (obviously), and lapping the valves by hand. I might also do a little smoothing of the ports myself, nothing crazy. Since ill be taking my heads off, id like to get the best, if any, power gain i can get. What is the max i can shave/mill these heads and still use 7.400 stock length pushrods? And what will my compression ratio be then? What kind of HP gains will i see? Can i still run crappy 91 octane gas (only thing avail out here)... Any other opinions or suggestions welcomed! I wont be putting these heads on for at least a month or 2. But im getting the heads this week and i want to prep them the best i can. Thanks!
<small>[ March 02, 2003, 12:10 AM: Message edited by: RTCamaroSS ]</small>
<small>[ March 02, 2003, 12:10 AM: Message edited by: RTCamaroSS ]</small>
03-02-2003, 12:35 AM
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Re: Head options, need input. The lift of your cam is going to really dictate how much you can mill them without P/V issues. Depending on that, I wouldn't go more than .30 and you may see a half point bump in compression tops.
03-02-2003, 12:39 AM
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Re: Head options, need input. Im running the ASA hot cam, specs are 226/236 .525/.525 on a 110LSA. So its low lift, but high duration. Dunno if that matters. Im looking to keep my comp cams chrome moly pushrods i just bought, they are 7.400 stock length. I seem to remember someone telling me you can only mill .020 and still keep stock pushrods.. i need to confirm that. And see what gains ill get with milling it that much.
03-02-2003, 11:03 PM
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Re: Head options, need input. Not 100% sure, but I believe the ASA cam has a similar size base circle as the stock cam. If that is the case, then don't mill the heads over .030", as this will increase the lifter preload, necessitating shorter pushrods.
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03-04-2003, 12:41 AM
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Re: Head options, need input. The shop that does your mill should check the clearance issues before they mill and let you know what can be done. I would get a good valve job and if it was me, run new valves, $160 and flow much better than stock.
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Good Luck,
ERIC
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Good Luck,
ERIC