Flycutting: Safe Solution to my problem? **HELP!**
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TECH Junkie
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From: Pittsburgh, PA
Flycutting: Safe Solution to my problem? **HELP!** Here's my problem (names have been withheld):
Company A sold me a set of camshaft specs based on data I provided about my setup (CR, head flow, etc.). From these specs, I purchased a custom grind from Comp that came out as an XE-R 226/230 .600/.601 110 + 4. Company A guaranteed me that I would have no P to V issues
because, "the piston will be 2/3s of the way down the bore when the valve hits max lift." Installer B, who currently has my car, says that there's no way that this cam will work with my heads (MTI SII LS6 milled .030). Installer B has a very good reputation and I don't question his assessment. Anyway, my options are to scrap the cam and buy another one ($400 lost + $400 for a new one) or to flycut the stock pistons. Is flycutting a safe option? Those who have done it on stock LS1 pistons: any problems? FWIW, Installer B doesn't usually recommend flycutting cast pistons, but said many have done it successfully! Whew...sorry for long post, but need help! 
Company A sold me a set of camshaft specs based on data I provided about my setup (CR, head flow, etc.). From these specs, I purchased a custom grind from Comp that came out as an XE-R 226/230 .600/.601 110 + 4. Company A guaranteed me that I would have no P to V issues
because, "the piston will be 2/3s of the way down the bore when the valve hits max lift." Installer B, who currently has my car, says that there's no way that this cam will work with my heads (MTI SII LS6 milled .030). Installer B has a very good reputation and I don't question his assessment. Anyway, my options are to scrap the cam and buy another one ($400 lost + $400 for a new one) or to flycut the stock pistons. Is flycutting a safe option? Those who have done it on stock LS1 pistons: any problems? FWIW, Installer B doesn't usually recommend flycutting cast pistons, but said many have done it successfully! Whew...sorry for long post, but need help! 
Launching!
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From: St. Louis, MO
Re: Flycutting: Safe Solution to my problem? **HELP!** There isn't anything wrong with notching the pistons. I did mine without a hitch. LGM has done dozens without any problems. The max you should cut is about .070", but I doubt you will be close to that. Just have your "mechanic B" install everything and check the clearance. You won't know till you put it together. DO NOT TRUST WHAT ANYONE SAYS ABOUT P-T-V CLEARANCE UNTIL YOU PUT THE PARTS ON YOUR ENGINE!!!
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TECH Junkie
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From: Pittsburgh, PA
Re: Flycutting: Safe Solution to my problem? **HELP!** Thanks for the suggestions...I'll ask installer B to test it to verify P-V before I lose my mind and panic...however, he gave me the indication that he didn't believe it would even be close in this case.
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From: Hartsdale, NY
Re: Flycutting: Safe Solution to my problem? **HELP!** do a search much discussed on this about six months ago - tons of stuff on this....
..one of the sponsors rents a special head that has the valve seats removed.....you use it with the Isky flycutters and the short block in the car...
...Diamond piston guy said it does not mess the motor balance up because little material is take off....
..one of the sponsors rents a special head that has the valve seats removed.....you use it with the Isky flycutters and the short block in the car...
...Diamond piston guy said it does not mess the motor balance up because little material is take off....
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TECH Junkie
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From: Pittsburgh, PA
Re: Flycutting: Safe Solution to my problem? **HELP!**
Did A know that you have .030 milled heads? .600 lift seems like a lot with milled heads.
