Hello everyone,

I have an '83 Oldsmobile 307 engine pulled out of a recently acquired Buick Riviera that I'm looking to have a little work done on. I've heard plenty of information regarding the 307, both yay and nay. Regardless of which, the engine landed in my lap, and I will be sticking with it for the time being. The engine was outfitted with 5A heads, and I'm looking for a little more information about these heads, specifically the chamber size of the heads. Does anyone have a spec sheet about these heads in particular that might have that information?

Thank you,
densen

 

BTR lists them as 67 cc

 

Thank you for your response TripDeuces. If I may be so naïve, what or who is BTR?

 

A 5A headed 307 SBO has to have a A4 manifold and is the better of the 307's. it a big car like the Riv, do you know if its the "9" motor or the "Y" motor. The 9 has a hotter cam and is found in the 442 and Hurst of that year and its in a few of the bigger GM cars like the Caddie

What is the VIN of the Buick? That is the only way your going to tell if its a Y or 9, assuming the motor is orginal

 

But, why?
Leave the 307 alone, use it until it dies

 

Bill Trovato Racing

 

Some good info on this site.

http://www.oocities.org/teamcat101/Olds307Tech.htm

 

Wow, thank you all for your responses.

The engine itself is a Y model, completely stock.

 

the Y is rated at 140 HP and 255 ft/lb

 

Not that it matters, but the 5A headed Y 307 was actually rated at 150 HP. The 7A headed Y was rated at 140 HP. Either way, they're both underpowered!