I have a set of heads sitting here at the shop that I'm considering throwing on my car. Albeit they are a little large, I don't see how with a custom grind cam, good matching intake, and a good tune, it couldn't pump out some serious power for a stock shortblock car. I've never had to worry about flycutting or PTV mostly because of aftermarket piston solutions in my motors but since I'd prefer to leave this motor alone, I figured I'd give it a shot. The heads in question are a set of victor Jr 210cc 2.05 intake and I believe 1.6 exhaust valved heads, lightly gasket matched. The only way to make them fit is by flycutting, however I don't have much experience with that and was wondering if anyone here does. Equally the same, I'm questioning whether the amount required to cut out of the piston will be so great that I could either weaken the piston greatly, or unbalance the rotating assembly by removing to much material. These heads are fairly large for the bottom end, and I am partially compelled to scrap the idea because of that. However I don't see how they CAN'T make good power, albeit a little high in the rpm band. I'd appreciate the help.
Heads and flycutting
- Thread starter Bad92GT
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The thing about this that i would worry about is, it's not so much the depth of the relief that becomes the issue but more of the width or diameter of the relief due to the 2.02 valve. What i'm getting at is, you're getting pretty damn close to the edge of the piston and that'll weaken it more than going deeper. The other thing i don't like about doing this with the pistons in the engine is that it's very hard to gauge how much you have taken off each piston and you can't balance their weight.
Personally i can't stand the idea of cutting stock pistons. The way i see it, they were cast/forged with the amount of relief they were intended to have, or in other words they don't have extra material for cutting like most aftermarket pistons do. Personally i wouldn't do it, but a lot of guys do and never have a problem. I'm a chicken when it comes to stuff like this, i don't have the cash to make expensive mistakes.
