300m Over Heating after Head Job

[mhskog]

Ok so I got a 300M with a broken timing belt. Pulled the heads, every valve was bent, not surprising since the belt let go at 4K doing a high speed pass. Ok So the heads are trash I get replacement heads from Odessa, put them in have a few minor problems but get it all buttoned up. Car purrs like a Kitten but overheats as soon as it's driven at all. I have 150 range compression on all cyl execpt 3,5 which I have 125 range, So I'm thinking I'm blowing compression into the water Jacket, when this thing blows it blows the blow off valve in the overflow goes as well as the radiator cap. Any thoughts, anything else to check ? I"m about to do the second tear down, which I'm dreading like the black death. Matt

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[93SVT]

Do a pressure test and/or a leakdown test before you pull it down again you could be wasting your time tearing into it maybe it's just air locked. your tstat could be failing it could be any number of things. Did you use a new water pump? Did you just assemble everything and fill it with coolant from the tank?

[kf4nxs]

I would do a pressure test on the cylinders and the coolant. just because you do these tests you could also have a damaged head gasket.