Tims 88GT

hey im lookin at a set of trickflow TW's and with my cam i think im going to get a clearance issue, with .522 i think its going to be tight. so can you fly cut pistons in the block? if so how do you and what tools are needed?

TMC

Max valve lift has very little to do with piston to valve clearance compared to the valve opening and closing events. What are the rest of the specs for that cam? You may not need to cut the pistons at all depending on what the specs look like.

Tims 88GT

ok this is what it is http://www.holley.com/products.asp?product=51023

TMC

That is actually a pretty small cam. I would bet that you don't need to flycut you're pistons however, you need to still check piston to valve clearance just to be sure. It'll only take a few minutes to do so please don't skip that step.

I am assuming that you have a stock piston, deck height and stock TW heads.

Fishhawk

Isky makes a Flycutting tool. All you need is and old head you can use as a guide.
http://www.iskycams.com/onlinecatalog.html
Click "Tools and Kits" then "Notching cutters"

Tims 88GT

yes everything is stock, im using the head out of the box, the bottom end is all stock. should i call trick flow and find out?

TMC

I wouldn't bother. They'll tell you to check P/V clearance and that's about all. I would simply proceed with confidence and a small piece of modeling clay to check for yourself. Checking will make you feel better about it too.

Tims 88GT

hey get this ford makes the x303 cam which is 286 duration and .542 lift and thats not supposed to hit with stock heads so i should be ok.

TMC

Max valve lift has very little to do with piston to valve clearance. Duration has more to do with it but you really need to look at the whole cam, including the opening and closing events to know if there will be a problem. Even then it's just a guess so you need to check P/V clearance no matter what cam. Plus, TW heads are not stock heads so you can't compare apples to apples there.

Tims 88GT

yeah, i know i was just sayin that, im going to check it so i dont have any problems, fishhawk thanks for that site now if i need to fly cut i can.