Well, one of the "issues" with the 307, is pathetic flow of the heads, right?
Look no further. These heads are a GREAT swap (must use aftermarket or 84 and older intake), and outflow ALL stock GM LS1, LS2, LS4, and LS6 heads. Ported they will outflow LS7 heads boys and girls!
And these as cast are excellent pieces, high velocity, beautiful castings. Even made in the USA!
http://www.rocketracingperformance.com/products/Engine-Trans/Heads/index.htm
Make sure John @ RocketRacing knows that I sent you. If there is any interest, IM me and I will talk to John about group pricing for CadillacForums members.
Ok, they are probably overkill for a 307, these are best for a larger inch engine, 350 and 403's, on a 350 with a decent cam are solid 10 second runners in a 3500# car, which it what they were designed after, a head that WORKED first. But there is no reason that you can't make a killer 307 out of these, the name of the game is airflow, how much can you get. A too small head on a 403 will never perform like a good breathing 307. You'll need a good cam (keep it small, do NOT go nutty here with heads that flow this good) and gears to make use of the wide power band this engine would have.
I'll talk to my resident Olds guru about a 307 combo with these heads....
Look no further. These heads are a GREAT swap (must use aftermarket or 84 and older intake), and outflow ALL stock GM LS1, LS2, LS4, and LS6 heads. Ported they will outflow LS7 heads boys and girls!
And these as cast are excellent pieces, high velocity, beautiful castings. Even made in the USA!
http://www.rocketracingperformance.com/products/Engine-Trans/Heads/index.htm
Make sure John @ RocketRacing knows that I sent you. If there is any interest, IM me and I will talk to John about group pricing for CadillacForums members.
Ok, they are probably overkill for a 307, these are best for a larger inch engine, 350 and 403's, on a 350 with a decent cam are solid 10 second runners in a 3500# car, which it what they were designed after, a head that WORKED first. But there is no reason that you can't make a killer 307 out of these, the name of the game is airflow, how much can you get. A too small head on a 403 will never perform like a good breathing 307. You'll need a good cam (keep it small, do NOT go nutty here with heads that flow this good) and gears to make use of the wide power band this engine would have.
I'll talk to my resident Olds guru about a 307 combo with these heads....