72 340 warranty block

dusterdale said

Oldmanmopar just a question.. wasn't the -1 and through the span of that -4 and -5 the core shift? A realignment of the core to get it back to acceptable tolerances? If that's the case wouldn't the first batch of -2 be tighter than the last ones of the 1? Just trying to not over hype the stamped numbers. I'm learning and there's a lot to learn!
Dale

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What I have found 1's and 2's are near perfect when sonic tested. Quality control personel on any pore usually checks the first two molds at the begining of the shift when they are being made.

I know this ffrst hand I worked at a foundry.

Usually at the end of the shift those making the molds were watching the clock to go home . Also the molds were still a bit damp. also quality control is gone for the day on long coffe breaks. You know how it is, Pride is always there at the start of a shift and disapears as the shift goes on.

The same goes for X blocks I have had them with real bad porosity. worse then stardard blocks. I believe it is due to High nickle content. Higher temp with damp mold.

Now this info is only what I have gathered myself over the years of owning and building many 340 motors. I saved many blocks over the years most all were low number or race blocks.

I had a -6 block throw #5 piston out of the block coming off the turn in a sprint car.. When you looked at the motor everything was gone around that piston. all that was left were the head bolts and part of the block bolted to the destroyed pan rail . It looked like it had a missing tooth.