measure how much i need to flycut my pistons??

 

.610 lift = .070 clearence.... shave .030 off your heads and have a smaller gasket (.042 instead of .050)...... so you cut .040 off but i would cut atleast .060-.080 (or be a risk taker and cut .110 on the intake and .120 on the exhaust)

 

I have .595 lift so that = .085 clearance? im shaving .036 off the heads for 60cc with a .045 gasket. plus .008 out of the hole ,so that .086 of clearance. am i right?

 

 

There are alot more determining factors than valve lift at .050". You have to consider duration, LSA, and advance to name the comon ones.

 

.595= .085-.036= .039-.005= .034

so you have .034 of valve clearance before you cut. on a safe motor, you want .110 of clearance. soooo.....

.110 - .034= .076 needs to be cut. its very easy and should only take you an evening if everything is pulled and your using the Isky cutters

good luck!

 

i'm going off the T-rex cam which is the most radical of all the hydro cams on the market

 

the cam is 114lsa. should i notch both intake and exhaust???

 

if your in there already, i would

your exhaust valve is coming down as your piston is coming up....

 

[QUOTE=ramairstyle00].610 lift = .070 clearenceQUOTE]
is that a fact?

 

its what Force Fed Performance told me

 

shouldn't that be .595= .085-.036=.049-.008=.041??
so- .110-.041=.069

 

sorry, i just woke up when i did the math

 

you said you had a .045 HG but in that math it says you have a .042 HG?

that would be .66 needing to be cut out..... aka- do .070 to make it easy. you have .300 meat in the pistons ( i think.... not 100% sure on that as i've not seen it with my own eyes)

 

im confused. wheres the gasket .045 in the math

 

Another variable is the AFR valve height. The distance from the tip of the valve to the bottom of the head. It is .010 to .015 higher than a stock head. You really should measure your p/v. You may not have to cut the pistons. Maybe I am incorrect here, but you can go to .080" on the intake and .100" on the exhaust.

 

You should forget the math and manually check the clearances,That is the only way you will know for sure.

 

I second that. There's NO WAY to tell 100% how much clearance you are starting with to determine how much additional clearance you need to make in the pistons. Clay the head so you know you have 0.xx" of clearance intake and 0.xx" clearance exhaust to start. Then figure how much you need to flycut from there. If you're changing gasket thickness or milling the head take those into account also.


I would like to know what the max. safe flycut is on a stock piston though if anyone knows off the top of their head.....

 

I would like to know what the max. safe flycut is on a stock piston though if anyone knows off the top of their head.....[/QUOTE]

I just had a simliar thread and from that and searching the max number seems to be .100

Brandon

 

I just had a simliar thread and from that and searching the max number seems to be .100

Brandon[/QUOTE]

Hey thanks Brandon!