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scj 428 overheating

January 11 2015 at 11:43 PM
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dusty pinkerton  (Login scjconv)
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I can really use some help with this one. I'm the original owner of a 1970 Mustang convertible powered by a super cobra jet 428.. I have always had low speed overheating, for example in parades and long traffic jams, but I now have an additional problem.
While using a LED temp probe I found my engine has 7 cylinders with about 350-375 degrees exhaust port temps, but the back one on the passenger is reading between 850-900 degrees. This is at about 900 RPMS. and I caannot find out why?
The engine has been gone through and has TRW forged aluminum pistons that are dished 28 CCs to lower the compression to a nominal 9.5-1. Using Edelbrock aluminum heads and waterpump, a 67 Ford 428 HP aluminum intake (This is the one Ford used to later mold the 428 cast iron one) MSD ignition, and the cam is a Comp 270-290, also using an aluminum radiator.
I have checked everything I can imagine, compression is steady at 155 in all cylinders, the cam lift has been checked with dial indictor and is OK.
I think the problem may be in the exhaust manifold only, but any suggestions are gladly excepted.

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