1970 Boss 302 rotating assembly
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rmcomprandy
1982GT
6 posters
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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
Thanks,
Bryan
1982GT- Posts : 113
Join date : 2015-04-30
Location : Toledo,Ohio
Re: 1970 Boss 302 rotating assembly
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..
Re: 1970 Boss 302 rotating assembly
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.
1982GT- Posts : 113
Join date : 2015-04-30
Location : Toledo,Ohio
Re: 1970 Boss 302 rotating assembly
Do a 347 the heads want more cubes
dfree383- BBF CONTRIBUTOR
- Posts : 14846
Join date : 2009-07-09
Location : Home Wif Da Wife.....
Re: 1970 Boss 302 rotating assembly
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
fastashley- Posts : 70
Join date : 2011-03-04
Re: 1970 Boss 302 rotating assembly
I've never had n issue with a 347 own a bunch of them over the years
dfree383- BBF CONTRIBUTOR
- Posts : 14846
Join date : 2009-07-09
Location : Home Wif Da Wife.....
Re: 1970 Boss 302 rotating assembly
Watch the AV boys with a 331 . Lots of videos and info on facebook about these guys.
https://m.youtube.com/watch?v=cnZXELWLMEY
https://m.youtube.com/watch?v=cnZXELWLMEY
whitefield- Posts : 2244
Join date : 2009-08-23
Age : 56
Re: 1970 Boss 302 rotating assembly
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.
1982GT- Posts : 113
Join date : 2015-04-30
Location : Toledo,Ohio
Re: 1970 Boss 302 rotating assembly
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.
gt350hr- Posts : 662
Join date : 2014-08-20
Location : Anaheim , CA
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