1970 Boss 302 rotating assembly

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1970 Boss 302 rotating assembly

Post  1982GT on December 7th 2016, 7:21 am

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
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Re: 1970 Boss 302 rotating assembly

Post  rmcomprandy on December 7th 2016, 12:14 pm

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..

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Re: 1970 Boss 302 rotating assembly

Post  1982GT on December 7th 2016, 2:04 pm

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.
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Re: 1970 Boss 302 rotating assembly

Post  dfree383 on December 7th 2016, 2:18 pm

Do a 347 the heads want more cubes
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Re: 1970 Boss 302 rotating assembly

Post  fastashley on December 11th 2016, 9:03 am

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

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Re: 1970 Boss 302 rotating assembly

Post  dfree383 on December 11th 2016, 11:33 am

I've never had n issue with a 347 own a bunch of them over the years
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Re: 1970 Boss 302 rotating assembly

Post  whitefield on December 11th 2016, 12:00 pm

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

https://m.youtube.com/watch?v=cnZXELWLMEY
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Re: 1970 Boss 302 rotating assembly

Post  1982GT on December 11th 2016, 12:23 pm

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.
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Re: 1970 Boss 302 rotating assembly

Post  gt350hr on December 20th 2016, 12:13 pm

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.

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