DemonInside

iTrader: (54)

i tried doing a search but not any luck, ok so im looking for a head gasket for a 402 4.005 bore motor im useing some tfs 225's

i was told cometics are very crucial on haveing everything machined perfect or they will leak so i was advised to go with a felpro

now what bore size gasket should i run ? i want it with a .040 compressed thickness

405HP_Z06

iTrader: (11)

Fel Pro's are out of the question if you want .040 MLS gaskets because they don't make one. The only gasket they offer that's close is the 1041 which is a steel core laminate instead of MLS.

IN MY HUMBLE OPINION, the Fel Pro is a better gasket but Cometic offers more options and they are reliable if you prep the deck surfaces correctly.

I'm running the Fel Pro 1161's and have had no issue's over the last year of daily driving.

DemonInside

iTrader: (54)

the 1041 will work i just didnt want no .045-.050+ ya know

these will be ok for a daily driven (only on warm non rainy days) 402 with around 11.5:1 scr?

405HP_Z06

iTrader: (11)

The 1041's are .041 crushed and have a 4.135" bore so they should work; also, confirm the width of the combustion chamber. From a reliability perspective, they are good gaskets so you should have no issues with what you want to do.

DemonInside

iTrader: (54)

cool thanks i wasnt sure if that'd be too big of a bore on the gasket but doubt it will be a issue, im gonna wait till im assemble my motor(3 weeks) to see how much the piston sticks out the hole before i order them, i just wanted to get a heads up well before then

71CamaroLS1

I've had Cometics on an LS1 (used) and LS3 (new) now with no issues at all, and no special prep done. They have far more options in terms of bore diameter and gasket thickness.