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I was always under the impression they stay pretty close to a j head combustion chamber , which will put you somewhere around 70 CC's you'll never know till you measure them.... How are those heads working for you?

No wonder the flow numbers were so good LOL my mistake thanks guys

Okay I am la man but I have read quite a bit about the Magnums and I believe the RT head to be the same head that was on The late model 360 RT,pickups durangos etc now the crate motor 360 may have a 202 valve in them already. Wait to hear from the Magnum crowd.

I believe the RT Magnum head to be one of the very best production small block heads ever made by Mopar and with a little work a 202 intake and minor porting they will run real close to a as cast Edelbrock or pro Comp style head.

I would not swap, 340 has lots of potential for up grades and are very desired in 340 cars with 400 hp on tap with good bolt on parts