Almost. No Boss 302 pistons, please. So long as you have 5.090" rods and an 8.2" deck block, they should all work. BUT, the best fit among the slight variations will be the one that gives YOUR shortblock the best piston-to-deck height. If your block has not previously been decked, then you have more choices. You may choose to buy a set of pistons, then mock up the shortblock, measure piston-to-deck, and then have the block decked to give you your desired p-t-d height (I like .005", nominal)
all 289/302/5.0 pistons except the boss 302 pistons interchange. they all have the same pin height. they also have four valve reliefs, but not for four valve engines. they have four valve reliefs so they can be used in either bank. some flattop pistons have have a slight dish in them to lower the compression ratio about 1/2 a point. there are a few factory pistons that have no valve reliefs, so be aware of that fact when buying replacement pistons.
There was an article in a magazine about putting the pistons in backwards due to the off set pin. It seemed to give a little more power. I think it was a Joe Sherman build. The claimed dyno results were 400hp with a Victor Jr intake. w/ the RPM intake it was around 385. This was all on pump gas. Just food for thought.
all 289/302/5.0 pistons except the boss 302 pistons interchange. they all have the same pin height..
All 302 flat tops are not the same pin height. This measurement varies from 1.585 to 1.619. Combine a mid 70's tall deck 302 block (8.226 vs the others with 8.206) and flat tops with a 1.585 pin and you still end up with a extra 9.5 ccs added to the volume. That will lower the com ratio by 8 or 9 tenths of a point. In an 8.226 deck block with a 64 cc chamber, that's going from 8.5 to 1 down to 8.12 to 1 . Mill the deck .020, choose 1.615 pistons and you're up to 9 to 1 with 64 cc heads. Go with 58 cc heads and it'll go up to 9.65 to 1. With 54 cc heads, that puts it at an even 10 to 1.
i thought 289's had a longer rod?
302/5.090, 289/5.155 rod length they both use 1.600 comp height pistons but one has a 3.00 stroke the other a 2.87
Would milled, shorter block (-0.020") require shorter pushrods or milling of valves too?
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