I just picked up a 454 engine from I think a 77 truck, so I know the heads and compression are no good for performance, but in the position that the block is in I can't get a good view at the number on the block but I did see that it said Passenger on the back of the block, which didn't surprise me, but it also said
Hi-Per which I have heard about but don't remember what it meant, and would like to know what it means.....possibly the 4 bolt block? I can't get to the engine enough to take off the oilpan...not to mention it is still full of oil, I can't get to the casting number on the block yet, the manifolds are still on and its covered in grime....but in most cases the casting numbers will only say 2 or 4 bolt. SO....what does Hi-Per mean?