Rear Head Bolt Seepage Continuous Problem - What To Do

94mustangsvt

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The driver side rear lower head bolt on my car keeps leaking coolant. I always put ARP thread sealant on all the bolts, but recently when I changed the cam I tried pulling the one bolt out and resealing it again.

After a few days, the leak is now much worse. The car runs great and has no coolant in the oil. The current block has maybe 10K on it because I got a refreshed level 10 bare block from DSS. However, the seepage issue was a problem on my old block as well so a block issue is pretty much ruled out.

Are the AFR heads maybe warped somehow? Last time I had them checked out they certainly didn't mention anything. Anyways, I'm trying to figure out what to do at this point. Should I try throwing a new head gasket on that side and hope it works or maybe try torquing the whole head down five more pounds? Any suggestions would be great, thanks.
 

RichV

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I had a funky leak in a tranny one time that I was chasing for over a year. Turned out it was a hairline crack in the aluminum case. They had to put it under a blacklight to see it.

I know this will be a PITA, but if you swap side on the heads and see if the leak follows the head or stays. At least you'll know to suspect the block or heads.
 
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94mustangsvt

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I had a funky leak in a tranny one time that I was chasing for over a year. Turned out it was a hairline crack in the aluminum case. They had to put it under a blacklight to see it.

I know this will be a PITA, but if you swap side on the heads and see if the leak follows the head or stays. At least you'll know to suspect the block or heads.
I had the same issue on a previous block though so I'm suspecting the heads. I'm going to try taking it down 5 more ft. lbs. in hopes of a non-big pain in the ass fix.
 

330CubeGt

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I would probably do every bolt to 80-85 ft/lbs if I was in your situation. And see if it helps.

-330CubeGt
 

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