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Bracket Talk Bracket Talk Forum Top Dragster & Top Sportsman Forums - by Oakley Motorsports favorite/best head gasket for boostGo | New | Find | Notify | Tools | Reply | |
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DRR Pro |
Recently installed new larger blower on my dragster. Went from older 1071 to new HH 1471. Boost jumped from 10 psi to 17 and blew out the Cometic head gaskets. Looks like I need something better at sealing. What is being used on boosted applications? Bruce Lee  Experience is what you get when you don't get what you want. | ||
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DRR Pro |
Bruce why not copper and o-ringed? When i changed jets i ended up having to change head gaskets.  | |||
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| DRR Pro |
definitely needs to be o ringed | |||
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DRR S/Pro |
I ran Cometics successfully up to 20+#, but if it gets lean you're in trouble. O-ring it and be done with it......... 272" Spitzer 540 Chevy The Blower Shop XR1 FTI XPM Series Converter FTI Level 6 Powerglide 3.69@199 .916 60' 2017 Bradenton Heads Up Madness Open Outlaw Champ 2018 PDRA T/D #5 2019 PDRA T/D #2 2020 Retired From T/D Competition.... 2020 Bradenton NMCA Hemi Shootout Winner 2021 getting back into bracket racing with a Gen3 Hemi powered 87 Cutlass. | |||
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DRR S/Pro |
Mine is o ringed on head, grooved in block. Using Flat out Gaskets, coated copper gaskets. 18-27 lbs boost. Clark very makes good gaskets but not coated so you have to silicon around all the water jacket holes if your block is wet Very important to re torque copper head gaskets after first heat cycle | |||
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| DRR Pro |
Moe, the cometics are what came with the engine/car when I bought it. I had planned on rebuilding after the Vegas Div. I'll just be doing that sooner. Still planning on running a wet block and looking for opinions on which will work best. Bruce Lee Experience is what you get when you don't get what you want. | |||
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| DRR S/Pro |
I don't think you can beat the Cometics other than going to O-rings. That being said watch your tune up, make sure it's not lean, read your plugs. Be a little conservative with timing and don't go over 20# boost. Make sure the deck surface of the heads are flat. Do you know the CR of the engine? I'm assuming it's a BBC, does it have the valley head studs? 272" Spitzer 540 Chevy The Blower Shop XR1 FTI XPM Series Converter FTI Level 6 Powerglide 3.69@199 .916 60' 2017 Bradenton Heads Up Madness Open Outlaw Champ 2018 PDRA T/D #5 2019 PDRA T/D #2 2020 Retired From T/D Competition.... 2020 Bradenton NMCA Hemi Shootout Winner 2021 getting back into bracket racing with a Gen3 Hemi powered 87 Cutlass. | |||
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DRR Top Comp |
sce cooper gasket and O-ring w/o question. Cost is lot less than burnt head. Works even when tuneup goes bad and at some point it will. America home of free. Brought to you by 2nd amendment. | |||
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| DRR Pro |
It's a factory Bow Tie block. So unless they were added buy the previous owner, I will say no. If they are not there I will add them. Bruce Lee Experience is what you get when you don't get what you want. | |||
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| DRR S/Pro |
It’s wet. Bob | |||
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DRR Pro |
Copper gaskets and o-rings with receiver grooves... I run a nitrous combo and that's what I use, run it more N/A than anything. Couple decent coats on each side with copper spray a gasket and not one single leak. Takes some work to get the heads off too. Nice because you can reuse the gaskets, saves some coin on refresh or teardown...and you can play with thickness of the gaskets too for tuning.....just a thought. Mark Goulette Owner/Driver of the Livin' The Dream Racing dragster www.livinthedreamracing.com "Speed kills but it's better than going slow!" Authorized Amsoil Retailer | |||
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| DRR Trophy |
To the OP: where did the Cometics fail? between cylinders? or were you pushing out coolant? We run Cometics and have started to push combustion pressure into cooling system at about 18#'s....head gaskets show some"fretting" or removal of black coating on both sides of the gasket near the block coolant holes at the rear cylinders..Heads may be lifting.Spoke with engineer at Cometic last week and he suggested Torquing the head, leaving it set for several hours, then mark ,loosen headbolt stud/nut and retorque...We're probably going to go the copper O-ring route although I prefer the overall ease of using the MLS gasket.Considering new head studs as well as these have been with the motor for years....As Bender stated, Lean tune up is tough on parts with Cometics and boost....Any one else experience combustion pressure in cooling system from head gaskets leaking? Thanks... | |||
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DRR Sportsman |
Similar experience, ran cometic and had great luck at 16lbs, at 18 started to show some fretting as you described. At 20-22 lbs had some pressurization of the cooling system and evidence on the deck that combustion was escaping from cylinder to water passenge. Would reseal (static compression didn’t change) and tried the retorque as described with no luck. Went to o-ring and copper gasket with copper spray and no problems at 32 lbs. 2015 M&M T/D Nemo Duty-Pride-Tradition FTM/PTB | |||
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| DRR Trophy |
Thanks Nemo !! Did you O-Ring the head and put Receiver groove on the block?... | |||
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| DRR Sportsman |
My o-ring is in the block with the receiver in the head. 2015 M&M T/D Nemo Duty-Pride-Tradition FTM/PTB | |||
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DRR Pro |
I use flat-Outs or clarks. 35psi all day long !!  Rolla Competition Engines Procharger Hemi Spitzer Racecars | |||
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| DRR Pro |
Gasket failed on #7 cylinder. Burnt through to head stud and on to the water jacket. Burnt the head, but I will be able to weld it up easily. Made 17# boost when it happened. I will be going to O rings and copper gaskets. Bruce Lee Experience is what you get when you don't get what you want. | |||
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| DRR Trophy |
Bruce..Was that on an iron block? Very similar failure on our motor...# 7 as well with the stud at the 5oclock position on that cylinder at 18#'s We're going copper and O-rings as well...What size bore were you running...?? | |||
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| DRR Pro |
Yes Iron Bowtie block #7 at 5 o'clock 4.530 bore. I bought a new Merlin 4 block so I will be starting out at 4.500. Bruce Lee Experience is what you get when you don't get what you want. | |||
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| DRR Pro |
I've always wanted to try the Willis/Cooper rings. Maybe I can talk a friend with a boosted bike (20-35 psi) to go that route.I am told that even if the head lifts a bit they are pretty good at staying sealed. https://en.wikipedia.org/wiki/Wills_Ring Later Larry Sapere aude! "Put some jam on the bottom shelf where the little man can reach it." "The Truth", it's just another liberal conspiracy! | |||
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Bracket Talk Bracket Talk Forum Top Dragster & Top Sportsman Forums - by Oakley Motorsports favorite/best head gasket for boost
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