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Good engine, good numbers, 500 hp in a 360 pump gas. There is something that caught my attention: a 1978 block, I guess a factory block, cut 0.40 when every book recommends 0.20 maximun 0.30. good power. I have a 1971 360 and plan to cut this 0.80. Congratulations on your results!



They have sonic testers up there so they know how much is safe to bore out b4 the walls get too thin. Which year is it dosnt really mean a thing. The earlier castings being thicker are just myths.

I think your 71 360 is the same casting as a 340 block...I have heard it was like that with the first years of the 360 when production overlapped with the 340...that would be the 71-73 360 castings. Still Id be afraid to cut that much without having a sonic tester. You might end up with cylinders with bores as thick as a coke can and ruin a good 360 block.



you are right about 1971 to 1973 360 factory blocks, same casting as a 340. i had the two blocks together, a 1990 and 1971 360 and can tell the difference in cylinder wall. of course a sonic test will tell you if the block is good for more like a 4.100