Good morning all, I am on my way to Oklahoma tommorrow and on my return trip I have the opportunity to pick up a complete 77 L28 engine with 44,000 miles on it for "free" in Sioux Falls. I tried searching advantages of the F54 over the N42 block. All I know is the F54 net HP was 145 ponies compared to the 135 ponies of the N42. The F54 also has the siamese cylinders where the P30 and N42 blocks were not and had coolant flow between cylinders. My intent is not to build a radical powerhouse but wo