Checking P2v and flycutting questions

[Marlboro_Man]

1. When checking P2V should i use NO head gasket, an old head gasket, the head gasket i plan to use???


2. If the pistons need to be notched can it be done with everything still in the motor, USING A DREMEL???


:SNSign:

 

[blkcobra50]

1. When checking P2V should i use NO head gasket, an old head gasket, the head gasket i plan to use???


2. If the pistons need to be notched can it be done with everything still in the motor, USING A DREMEL???


:SNSign:

use the head gaskets you plan on using. when the clay is in the right position just torque the head down to 30 lbs. Get the isky tool for fly cutting the pistons. What is your combo going to be?

 

[Marlboro_Man]

So if I use the HG's i'm going to use it won't hurt them to torque them down to 30 ft/lbs for checking P2V?


Combo will be everything in my sig plus:

AFR 165's
1.7 rr's (If they don't cause p2v probs)
new timing chain
new water pump
new lifters
new pushrods
new balancer
24# injectors
80 mm pro-m
MORE NITROUS

 

[jrichker]

I always wondered what flycutting the pistons while they are still in the engine did to the balance. It seeems to me that it would throw the balance off. The pistons are supposed to weigh in at a specific weight plus or minus a gram or so. You wouldn't need to remove much metal to get out of that tolerance range.

 

[rd]

I tried a spare piston with a Dremel and decided I did not have the patience to do it that way. I got the Isky tool for the intakes, the exhausts are supposed to clear. I am going to try all this soon I hope....

This particular motor was never balanced, and the TRW pistons are supposed to be heavier than stock, so the few ounces removed should not hurt.

If this does not work, I may just do another shortblock or take it apart and get new pistons.

 

[Marlboro_Man]

I always wondered what flycutting the pistons while they are still in the engine did to the balance. It seeems to me that it would throw the balance off. The pistons are supposed to weigh in at a specific weight plus or minus a gram or so. You wouldn't need to remove much metal to get out of that tolerance range.

Thats a good point, I wondered about how it would affect the compression ratio accross the cylenders, if there was a slight difference in the amount taken off each piston.