marksmopars
Well-Known Member
I am assembling a 340 for my 70 dart, original 198 /6, and got a 69 +30 340 block on the dl from a bud. The block will clean up easily at +40, question is the corner of the block is broken and I am not certain if it is a concern or not. The rear corner is broke through the locating pin hole. I have an option as a 84 318 block, which has roller lifter. I took it apart as a parts donor anyway, but am really interested in your opinions on this. I have a stock forged crank and a set of J heads with hardened seats which I would place on either block. Your opinions please, is the 340 block ok or should i use the 318, or is the 340 ok but use the 318 anyway?