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Old 09-08-2010, 05:28 PM
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Coolant leak from under heads help!!!!

I have a chevy 350 so I swapped the tbi heads for tpi 128 heads and 015. Head gasket and now coolant is getting the the cylinders and leaks between heads and block I torqued them 60ft pounds using the same head bolts did I do something wrong

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Old 09-08-2010, 06:07 PM
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prettyboyced,

You could be using some "one time head bolts" They are used on newer engines and they don't seem to hold a second tightening. When you buy gaskets the parts guy will ask you if you need new bolts. Say yes.

Scholman(retired)
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Old 09-08-2010, 06:10 PM
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Yes it's a newer block 90s and I got the head gasket from summit
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Old 09-08-2010, 06:18 PM
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Im thinking that you got some "shim" style head gaskets? If so, they will leak when used with newer heads. Comes from the bottom of the head, between the block and the head. Most companies give a warning about this, but some do not.
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Old 09-08-2010, 06:23 PM
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Is your sbc a GEN I? If it is a an older GEN I sbc your heads will not work on this sbc. They will bolt up fine. The only way to tell for sure is to check your oil bro. Make sure the coolant is not in the oil. If it is not in the oil we are good, and just get some new bolts and bolt heads up specifically to BOLT SEQUENCE. I had a block I did not bolt in the order it is suppose to be bolted and had the same issue wih knew gaskets lol.

JD
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Old 09-08-2010, 06:25 PM
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Yes it was some shim style gaskets
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Old 09-08-2010, 06:28 PM
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It's newer style gen 1 block and I torqued them down in the right order
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Old 09-08-2010, 06:37 PM
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I don't want to worry you any yet but check your oil to see if coolant is not present in it. I currently have a GEN I with TPI GEN II heads and learned this error the hard way. I had to get them custom welded and reworked to be compatible ith the GEN I sbc
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Old 09-08-2010, 06:39 PM
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Did you put some Copper-Cote on them? I had trouble with them leaking, then i used that. And thats on my 355 in my IMCA Stock Car, turning about 7200 rpm...never had a leak since i used some sort of sealer! Im not thinking its a bolt issue, check the torque on them, and if its still at 60, the bolts aren't to blame. I torque all my head bolts to 70 pounds, but thats with ARP studs.

Get a can of it, and use the WHOLE can on both sides of both gaskets, and i bet your problem goes away.
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Old 09-08-2010, 06:49 PM
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I used fel pro 1094 and it said not used any coat sealer and I have aluminum heads
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Old 09-08-2010, 08:19 PM
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Pretty much mandatory to have the heads resurfaced when going to a shim gasket, especially aluminum. Did you?? The shim gasket does not tolerate out of flatness errors like a composite gasket does.
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Old 09-08-2010, 08:28 PM
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Yea I made sure that heads were flat I got them milled for more compression
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Old 09-08-2010, 10:33 PM
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How much were thr heads milled.Do the head bolts bottom out
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Old 09-09-2010, 03:11 PM
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.010 and no they don't
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Old 09-09-2010, 04:42 PM
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Quote:
Originally Posted by prettyboyced
I have a chevy 350 so I swapped the tbi heads for tpi 128 heads and 015. Head gasket and now coolant is getting the the cylinders and leaks between heads and block I torqued them 60ft pounds using the same head bolts did I do something wrong
If by 128 you mean the 14101128 aluminum head, they can't be sealed with a shim gasket. They require a thicker gasket that is either an MLS type or a composite. These will be thicker which will reduce compression. But the 128 head on a stock piston-ed bottom end may still have excessive compression problems, the chambers are a lot smaller than those of TBI heads.

Bogie
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