What is flycutting?
Thread Starter
Racer
Joined: Mar 2007
Posts: 337
Likes: 0
From: yorktown virginia
What is flycutting?
Well as im in the market for a cam, I keep running across the term flycutting... I have gathered that it is to ensure the valve doesnt reach the piston but what I wanna know is this
A: how is it done
B: What does it cost
C: on a STOCK 5.7 from a 1997, what cam profile would be too large that it would NEED flycutting..
D: if you havent guessed.. i really dont wanna have to flycut anything....even though im not sure what it is or how to do it.
A: how is it done
B: What does it cost
C: on a STOCK 5.7 from a 1997, what cam profile would be too large that it would NEED flycutting..
D: if you havent guessed.. i really dont wanna have to flycut anything....even though im not sure what it is or how to do it.
Pro
Joined: Oct 2000
Posts: 545
Likes: 1
From: Charlotte NC
Flycutting is basically cutting reliefs (milling down a portion) in the top of the piston to allow clearance for the valves when a high lift cam or other mod that might create close tolerances in the valvetrain. You would want an experienced person with the right machine equipment to do this! Most that have high lift cams have not had to do this, you just need to be aware of the specs for the cam, lifters, etc.
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
Here's an "amateur" fly cut job ... but the 3rd picture down gives you an idea of what the result looks like ..... Don't try this at home ... EVER .... 
http://forums.corvetteforum.com/show...hlight=fly+cut
http://forums.corvetteforum.com/show...hlight=fly+cut
Thread Starter
Racer
Joined: Mar 2007
Posts: 337
Likes: 0
From: yorktown virginia
cool now that i know what it is, someone tell me what numbers on the cam profile dictate either a smooth idle or a potato gun...and what cam would be agressive enough to warrant flycutting so i can avoid it like the plauge..
Safety Car
Joined: May 2003
Posts: 3,814
Likes: 105
From: Dearborn Heights Michigan
I have a Comp Cam with .315/.317 lobe lift with 1:8 rockers giving a valve lift of .566/.569 and have no piston interference. Duration 224/228. Nice lope and great performance and no problems with everyday driving. Idles at 950.
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