![]() Man, did we find a bunch! First, even before we got into the tear down, we found that the engine had 2 different heads! One from a truck, and the other from a later car (smaller valves!). He burned out 3 starters in a week! I finally talked him into taking the engine back out and doing a tear down, to see what was going on. After a week of this, when the engine got hot, you could not start it. The engine ran, but not well, and after about 1/2 hour driving, it seemed to get real hot and would smoke. When he bought it, it had been butchered by a back yard mechanic, that had no idea of what he was doing. My oldest son built up a truck 350, for use in his El Camino. Still a really good block! When I was regularly street racing on Telegraph in Detroit, I had pretty much the same block, with TRW forged pistons, stock cast crank, cleaned up rods, and balanced, and literally beat the hell out of it almost every Friday and Saturday night all summer! And the was also with a 200HP hit of Nitrous! It was a great motor, and when the subframe finally split on the poor Monza that it was in a local farmer bought it to put in his truck. They would also have their coding beginning with a 'C', and not a 'T'. Blocks that where used in 300HP and over configurations had the longer "nodular" iron center main caps. Yes, the "Nickel" myth is just that, a myth! This information is pulled directly form my " 1965-1970 Chevrolet by the Numbers" book! As far as the nodular center main caps, that would be a no. It's your good ole early 1970's 4 bolt main truck block. That block was introduced in May of 1969 and was used through model year 1975. Your block code TAX with casting number 3970010 is a standard 1970 truck block C10-3500 series, 255HP, 4 barrel carb.
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