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Old 01-31-2012, 04:18 PM
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Cometic head gasket oil leak fix question

Whining again about my new high dollar professionally built 496 blower motor. I pulled the engine and confirmed the oil is seeping out both side where the heads are rounded in the rear. Both sides have a nice oil trail. I can only assume the engine builder didn't get things smooth enough. I am going to pull the Edelbrock heads, clean it up and put felpro 1017's on. It has ARP bolts with 1/2" 12 point heads. Not sure if engine guy used eddy specific bolt or if it matters on a mark IV. Any tip on reassembly would be greatly appreciated.

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Old 01-31-2012, 05:14 PM
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Quote:
Originally Posted by Blown496
Whining again about my new high dollar professionally built 496 blower motor. I pulled the engine and confirmed the oil is seeping out both side where the heads are rounded in the rear. Both sides have a nice oil trail. I can only assume the engine builder didn't get things smooth enough. I am going to pull the Edelbrock heads, clean it up and put felpro 1017's on. It has ARP bolts with 1/2" 12 point heads. Not sure if engine guy used eddy specific bolt or if it matters on a mark IV. Any tip on reassembly would be greatly appreciated.
What kind of blower pressures, my experience has been that boosted motors really need stainless O rings to stay tight especially when they see frequent excursions into high power settings. I'd also gone for studs rather than bolts, understand that in the end the strength of the threads in the block dictate how much force can be applied, but studs remove installation, removal wear and tear on those threads as well as the rotational moments when torquing the fastener. This lets you get to the higher yield modulus of ARP fasteners which is necessary with a blower to keep the head well and evenly squished between the fastener and the block deck. I, also, like to go around the fasteners every few months just to be sure they're holding their torque settings. I find that blower motors are not the kind of thing you build and forget, they like a little extra attention.

Bogie
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Old 01-31-2012, 05:48 PM
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I 2nd the studs..
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Old 01-31-2012, 06:12 PM
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About 5lb boost and only the occasional cruise night burst. Spends 99% at 2000rpm.
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Old 01-31-2012, 06:49 PM
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Have you re-checked the torque on the head bolts?

I'd also suggest a switch to studs, but check the torque first, to see if you can pinpoint the issue.
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Old 01-31-2012, 06:54 PM
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Torque is right on. Do Mark IV blocks have blind holes in the corners? Could that be the problem?
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Old 01-31-2012, 08:30 PM
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All head bolt holes are thru to water and require sealer
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Old 01-31-2012, 08:49 PM
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Just makes no sense oil could migrate like that.
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Old 02-01-2012, 12:26 AM
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From what I've been told buy the engine builders I know, you must spray the Cometic gaskets with Hylomar between the layers. They have seen many a gaskets wick oil through the layers. Hard to believe.
I'm converting my Rodeck block from "O" Ringed and copper head gaskets to regular flat deck with Cometic or FelPro MLS. I cant take the leaking mess any more! The machine shop was able to cut the stainless "O" Rings flat and do a slight deck job on it. Can't wait to get her back together. Looks purdy!

Keith
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Old 03-20-2012, 04:30 PM
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oik leak

i thought mine were leaking between the block and head, but at a closre inspection, the head gaskets didnt come all the way to the intake mating surface, i thought i sealed them well, but one corner is leaking in the back, it was really hard to tell where it was coming from, but the oil was running down under the lip of the head, you cant just put silicone on the block where the intake meets, but fill the small area where the head gasket doesnt come all the way up to the intake, front and back.
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Old 03-21-2012, 07:03 AM
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i thought mine were leaking between the block and head, but at a closre inspection, the head gaskets didnt come all the way to the intake mating surface, i thought i sealed them well, but one corner is leaking in the back, it was really hard to tell where it was coming from, but the oil was running down under the lip of the head, you cant just put silicone on the block where the intake meets, but fill the small area where the head gasket doesnt come all the way up to the intake, front and back.

I sent the gaskets to Cometic. They told me the .050 gaskets with a solid cylinder ring sometimes would not crush. That was causing some compression leaking and forcing liquid between layers. They are sending me a new 5 layer design set at no charge. That is a stand up deal in my book.
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Old 03-21-2012, 12:26 PM
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glad they are standing behind there product, if i have anymore issues with mine, i'll do the same, lol
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