Re: Can you use a Cometic head gasket on a
[Re: Cab_Burge]
#1607974
04/15/14 10:31 PM
04/15/14 10:31 PM
|
Joined: Dec 2012
Posts: 1,824 Wind Gap,Pa.
Sammy
OP
top fuel
|
OP
top fuel
Joined: Dec 2012
Posts: 1,824
Wind Gap,Pa.
|
Quote:
Sounds like you need a reciever groove to help seal the motor Regardless of which type of gasket
Cab, it has always worked at 13.5 compression but I just redid the motor and it now has 15.3 compression. 5 passes and its leaking, tore it down, copper coated the gaskets till tacky and retorued it down. It is still leaking badly, even worse.
|
|
|
Re: Can you use a Cometic head gasket on a
[Re: Cab_Burge]
#1607980
04/16/14 04:34 PM
04/16/14 04:34 PM
|
Joined: Mar 2006
Posts: 9,910 Eighty Four, PA
B G Racing
master
|
master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
|
We have been using UltraCopper on copper head gaskets for years with zero coolant leaks.O-ring and reciever grooves with copper gaskets is a foolproof way of sealing compression,but unless you get 100% annealing of the o-ring in the gasket and 100% gasket enbeddment into the reciever grooves the flat surfaces tend to not seal.Apply a coating of UltraCopper silicone around all coolant and oil passages on both the block and head side,being carefull not to put it to close to the oil passages so it doesn't migrate into the passages causing restriction.It is important to snug down the head bolts and allow the silicone to cure for at least 24 hours,then final torque the bolts.It works better than any of the coated copper gaskets.Sometimes the copper gaskets are too hard and must be heated to get proper annealing and some gaskets are stamped from a sheet of copper and the thickness varies.Soft evenly rolled gaskets are the best and ones that are lasered or CNC cut are more uniform in thickness. If your block and,or heads are o-ringed or have reciever grooves and you want to use Cometics then fill the grooves with a filler like Alvins' LabMetal or similar.
Last edited by B G Racing; 04/16/14 04:38 PM.
|
|
|
Re: Can you use a Cometic head gasket on a
[Re: dogdays]
#1607983
04/16/14 10:11 PM
04/16/14 10:11 PM
|
Joined: Mar 2006
Posts: 9,861 MI, usa
dvw
master
|
master
Joined: Mar 2006
Posts: 9,861
MI, usa
|
Quote:
Hylomar is the stuff, just don't get it on your fingers.
R.
My blown SB had an O-ringed factory 340 block. I decided not to use the O-rings and filled the grooves with JB weld. Scrapped it flush with a razor blade after it dried. Ran it that way for years at 12PSI with no gasket failure. Doug
|
|
|
Re: Can you use a Cometic head gasket on a
[Re: dvw]
#1607984
04/16/14 11:16 PM
04/16/14 11:16 PM
|
Joined: Nov 2004
Posts: 4,330 Lynchburg, VA
Leon441
master
|
master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
|
Are you using new gaskets? If the O-ring stands out more than .012 you will also have trouble. A .010 deep .041 wide receiver will allow the gasket to pinch tighter. Some o-ring jobs are horrible. The fit of the ends is important. Cosmetics will work with job weld or copper o-rings filed flat. As always if the surfaces are not flat nothing will work
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
|
|
|
|
|