moparspares
Well-Known Member
Im interested to know more about Mopar R4 blocks. I know they were used in Pro Stock Truck in the USA and our Pro Stockers here in Australia. What are the specs of these incl bore size, degree, what heads can be used on them. Were they built specifically for pro stock truck or were they used in Nascar or speedway cars. Were they only cast iron or was there an aluminium version. There is not much info floating around on them. I have no ambition in owning one just interested in knowing a little about them.
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