455 shortblock back from machine shop (head gasket)
#1
455 shortblock back from machine shop (head gasket)
I went and picked up my freshly machined and assembled shortblock from Mark R.'s place on Saturday. I need to select a head gasket out of all the ones available.
Any suggestions on which one I should get? FelPro? MrGasket? Mahle? Cometic? I plan to have it all assembled by the 29th and will take it back over to Mark's to make some pulls on his dyno.
Any suggestions on which one I should get? FelPro? MrGasket? Mahle? Cometic? I plan to have it all assembled by the 29th and will take it back over to Mark's to make some pulls on his dyno.
#12
Why are the heads not being milled straight? After going through the expense of machining the short block that would be a short cut that I would not take. Any thoughts on this from the pro engine builders here have to say?
#13
Because this engine had been done both on the heads side and the deck after which it had about 3-4 hours of runtime. Then got over revved and spun a coupla rod bearings. I brought it to Mark to redo the shortblock. The deck was cut again to get close to 0 deck with the new rods and pistons. There really wasn’t a need to cut the heads again. However, after going out into the garage and looking at the heads again, apparently, I missed the fact that the gasket mating surfaces have had either a cleanup pass or they are just that clean. Maybe I should go with the Cometics
#15
Ok, so it really comes down to compressed thickness desires and price since all else seems equal with fresh surfaces. And, lastly, install dry? Or use this: https://www.permatex.com/products/ga...sealant-12-oz/
I've always installed dry with FelPros and never had an issue. I definitely don't want any issues with this one.
I've always installed dry with FelPros and never had an issue. I definitely don't want any issues with this one.
#17
Because this engine had been done both on the heads side and the deck after which it had about 3-4 hours of runtime. Then got over revved and spun a coupla rod bearings. I brought it to Mark to redo the shortblock. The deck was cut again to get close to 0 deck with the new rods and pistons. There really wasn’t a need to cut the heads again. However, after going out into the garage and looking at the heads again, apparently, I missed the fact that the gasket mating surfaces have had either a cleanup pass or they are just that clean. Maybe I should go with the Cometics
Deck was done to 10.615”, which puts the piston .005-.007 in the hole.
And I’d install the FelPro, Mr Gasket or Cometic/Mahle dry.
#18
Cometics (or any MLS gasket) have a surface finish requirement - 50 RA or finer. Smooth finish with no mill marks. Just make sure the machine work was done with that in mind if you go that route. I've never found a reason to use sealers on head gaskets when everything is machined flat, and you aren't doing something crazy like trying to re-use a gasket.
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pettrix
Racing and High Performance
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May 22nd, 2021 08:58 AM