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09-22-2014, 03:02 PM
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CC Member
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Join Date: Jun 2007
Cobra Make, Engine: SPF GT40
Posts: 236
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Not Ranked
Coolant leak
Experiencing slight coolant leak between head and block #1 cylinder right side for the second time. Superformance GT40, Roush 427SR, Dart iron block, AFR heads. First leak at 18K miles. Removed heads, had resurfaced, new Felpro 4.125" bore gaskets (slightly oval ones). Block surface fine. OK for 2500 miles, now slight leak at same location. Any suggestions? Retorque? Thought Dart iron blocks didn't require head bolt sealer? If retorque fails any suggestions on head gasket installation. Noticed on 1st disassembly that those Felpro gaskets brinell aluminum of head.
Last edited by SwiftDB4; 09-22-2014 at 07:40 PM..
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09-22-2014, 11:06 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Re Brinelling of the head. Find a head gasket that uses a pre-flattend sealing ring around the cylinder. An example of such for a 4.00 bore fitament in Felpro is 1011-1 and 1011-2 (pre-flattened.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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09-23-2014, 12:05 AM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,433
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Not Ranked
If you are absolutely sure it's coming from the head gasket, switch to a Cometic MLS gasket.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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09-23-2014, 02:10 AM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,773
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Not Ranked
Quote:
Originally Posted by bobcowan
If you are absolutely sure it's coming from the head gasket, switch to a Cometic MLS gasket.
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Agree.
And what head bolts/studs are you using?
__________________
Gary
Gold Certified Holden Technician
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09-23-2014, 07:53 AM
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CC Member
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Join Date: Jun 2007
Cobra Make, Engine: SPF GT40
Posts: 236
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Not Ranked
The Felpro gaskets 1022 and 1023 are pre flattened, but still brinell the aluminum. Using ARP head bolts. Wasn't sure about Cometic-thought head and block surfaces had to be ultra smooth?
I have used Cometic on other engines and like them.
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09-23-2014, 09:49 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,391
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Not Ranked
You sure it's not something else leaking and running down?
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www.lykinsmotorsports.com
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09-23-2014, 12:03 PM
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CC Member
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Join Date: Jun 2007
Cobra Make, Engine: SPF GT40
Posts: 236
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Quote:
Originally Posted by blykins
You sure it's not something else leaking and running down?
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Any way for intake manifold to leak and only run to outside of block/head interface at front cylinder? Only coolant leaking, no oil. Water pump OK.
Last edited by SwiftDB4; 09-23-2014 at 12:07 PM..
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09-23-2014, 12:04 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,391
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Yes, if the gasket isn't sealing. You can also have a thermostat housing leak or similar.
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www.lykinsmotorsports.com
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09-23-2014, 01:18 PM
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CC Member
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Join Date: May 2006
Location: Concord Twp.,
OH
Cobra Make, Engine: Everett-Morrison 427SC 302 smallblock. 431 stroker in the works, tremec 3550
Posts: 200
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Not Ranked
I once had a leak that showed itself in the same area. It didn't leak when the engine was warm, but it had a wet spot right on the head gasket in the front corner when the engine was cold. I assumed the head gasket was failing, but since it didn't seen to leak while the engine was running I put off fixing it for a while. While doing a cam change, I found that the leak was actually was caused by an intake manifold gasket that had been crushed at the water passage. This was a 302 with 351 Windsor heads.
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09-24-2014, 03:22 AM
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CC Member
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Join Date: Jan 2009
Location: Harrison Twp,
MI
Cobra Make, Engine: SPF Coupe #136, 427SR FI
Posts: 299
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Not Ranked
Quote:
Originally Posted by SwiftDB4
Any way for intake manifold to leak and only run to outside of block/head interface at front cylinder? Only coolant leaking, no oil. Water pump OK. |
Very possibly.
I had spotty coolant on the block sides, near the water pump and at the back of the block.
IT WAS AN INTAKE GASKET. Each of the ports were deteriorated due to the intake not torqued properly.
R&R the intake gaskets with Roush spec'd metal lined gaskets and all set.
Jeff |
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