pontiac 301 question

[buzz77]

Currently my 79 has the 2 barrel carb. IF I swap it out for the 4 barrel would it be a direct bolt on or would I require the intakemanifold?

Also the 301's with 170hp, what did these engines have to give them 20 extra hp?

 

[olds307 and 403]

You need the manifold. The 170 hp version had a hotter cam.

 

[Randy_W]

301's respond real well to the old 400 H.O. cam from like a WS motor, just be sure you have enough carb and exhaust, 2 1/4" duals or a single 3" work well on those. It's never gonna be a race motor but they can surprise you.

 

[buzz77]

Thanks guys. Is the intake manifold from the 301 turbo the same as the n/a 301?

I know they make an aftermarkrt cam kit from comp cams. I just got a true dual system with cat delete mostly for the sound and looks. But I was thinking if I switch out the granny gears, add the 4 barrel and possibly a cam swap it can be a pleasant surprise.

One more question, was the 7.5 posi only offered with the 28 spline axles?

 

[olds307 and 403]

You can get the smaller 26 spline 7.5" posi. Other than the Monte SS, which are 26 spline, the stronger 7 5/8" posi are 28 spline.

 

[buzz77]

The 28 spline would just require swapping out the axles? There seems to be plentiful 28 spline posi carriers out there but not many of the 26.