Fly Cutting Pistons...What is involved?
Thread Starter
On The Tree
Joined: May 2004
Posts: 114
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From: College Station, Tx
Fly Cutting Pistons...What is involved? Enlighten me please...im going to have to do it to fit a bigger cam with my heads b/c they are milled around .10...whats involved and about how much does it cost...thanks, Jason
Wow with your current cam you have to be close to PV, I would think an over rev or float might be a disaster. Notching the pistons is time consuming, but not terribly difficult. To me the most important part is measure, measure , measure. Do a search, there is a great write up that I found to be invaluable. Locally a head with the Isky tool rented for $50.
TECH Enthusiast
Joined: Jan 2004
Posts: 539
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From: Grand Rapids, MI
Not really that difficult, just time consuming with the all the measuring.
flycut how to
Most places will rent you a flycutting "kit" for about $50 or so.
flycut how to
Most places will rent you a flycutting "kit" for about $50 or so.
Originally Posted by bigdsz
Wow with your current cam you have to be close to PV, I would think an over rev or float might be a disaster. Notching the pistons is time consuming, but not terribly difficult. To me the most important part is measure, measure , measure. Do a search, there is a great write up that I found to be invaluable. Locally a head with the Isky tool rented for $50.
Dixit
I have a Comp XER 228/230 .588/.591 112+2 with Absolute speed 5.3 heads unmill,everybody told me it would fit no problem. I was dubious and put a degree wheel on and at 8-10* btdc I had like only .045 clearance and it should be at least .080 if I remember correctly. We just notched my friends pistons and he's running a Comp 242/248 .610/.615 112 with AFR heads milled .035. We put the degree wheel on to check clearance and the valve hit the piston. I contend that a lot of guys are running around with a lot tighter P/V clearance than they realize, and are only an overrev or valve float from contact.
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Originally Posted by bigdsz
I contend that a lot of guys are running around with a lot tighter P/V clearance than they realize, and are only an overrev or valve float from contact.
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Verdad Gallardo TECH Enthusiast
Joined: Jan 2004
Posts: 539
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From: Grand Rapids, MI
Originally Posted by RPO_Z06
I would have to agree..
Just for the record, I checked a friends set-up and with AFR's milled .035 (also with a F13), he had about .075 clearance. 
Originally Posted by f-bodman
I agree also, I had a few more knowlegable people tell me my combo would fit "no problem", luckily I checked it anyway just for my own piece of mind and was surprised when I couldn't turn the motor over, I actually had about .012 interferance at 8* Just for the record, I checked a friends set-up and with AFR's milled .035 (also with a F13), he had about .075 clearance.
Just for the record, I checked a friends set-up and with AFR's milled .035 (also with a F13), he had about .075 clearance.