86GutlessCutlass

I have a 350 olds engine in my 1986 olds cutlass when I bought the engine it came with a set of 3a heads on it I have a set of 7a heads off of a 307 engine from 1986. My question is would I be better off keeping my heads i have on my car or are the better ones the 7a heads. I have upgrades on my car. I have a edelbrock perkormer rpm intake, I have a thumper cam with a 2100 rpm stall, plus headers. That is NOT the big ***** thumper cam. Let me know what yall think. Thanks.

svnt442

The 307 heads will choke that thing.

86GutlessCutlass

Alright. I just wasn't sure. I've heard stories between certain heads that one flows better then the other. And I've had problems with my left bank running hotter then right bank

joe_padavano

Just so we're all clear, the 307 heads are the 7A heads. These have the tiny intake and exhaust ports that restrict performance on a 307, let alone on a 350. There are also 7A heads used on the 1972 350 motors. These would be a good choice, but don't confuse the two. Pretty much any heads where the "A" is the same size as the number are smog heads. If the "A" is smaller and below the number like a subscript, those are acceptable.

captjim

Good pic,
https://www.google.com/search?hl=en&...ha8Q88t-EVM%3A

1BOSS83

Big fan of this head resource OP- Its a good mix of 'i've heards' and generally accepted Oldsmobile head principles.

http://www.442.com/oldsfaq/ofhed.htm