1970 Boss 302 rotating assembly

Digging further into this engine, we've found out that everything needs to be replaced. Now that it's apart, we've discussed adding some cubes. I think a 331 would be perfect, but haven't seen anything offered for the Boss engines. Can anyone point me in right direction?

Thanks,
Bryan

rmcomprandy wrote:

1982GT wrote:Digging further into this engine, we've found out that everything needs to be replaced. Now that it's apart, we've discussed adding some cubes. I think a 331 would be perfect, but haven't seen anything offered for the Boss engines. Can anyone point me in right direction?

Thanks,
Bryan

Same as any other 331 small block 302 Ford engine would use except pistons with a crown for a Boss head.

I don't think there is an available KIT; you have to make it or get someone else to..

Thank you. I found that Diamond offers a piston for a Boss headed 331.

Do a 347 the heads want more cubes

The heads could use more cubes, but I've never liked the 347. Seems like too much stroke for an 8.2 deck, loading the sides of the cylinder walls. The 331 seemed like a good compromise. I've done a lot Cleveland/Boss stuff, usually had to custom order. Not much off the shelf

I've never had n issue with a 347 own a bunch of them over the years

Watch the AV boys with a 331 . Lots of videos and info on facebook about these guys.

https://m.youtube.com/watch?v=cnZXELWLMEY

fastashley wrote:The heads could use more cubes, but I've never liked the 347. Seems like too much stroke for an 8.2 deck, loading the sides of the cylinder walls. The 331 seemed like a good compromise. I've done a lot Cleveland/Boss stuff, usually had to custom order. Not much off the shelf

Since this is a semi restored car...In this particular case, I think the 331 is best suited for what we're trying to accomplish...adding more cubes and dropping compression...Making this old car pump gas friendly without losing any performance...
I agree about piecing together my own kit...talked to CNC Motorsports...Diamond makes a stroker piston for the Cleveland/Boss heads...just shopping around right now though.

I ran a Boss 302 (A4 block) with a 3.500 Moldex crank and a 5.4 rod for 15 years ( drag racing). I sold the block and switched to an aluminum block. After all those years the block had less than .001 taper/wear. The proper piston design is critical.