I have a 351w eith d80e heads. I'd like better flow, so I'm considering pulling some gt40s.

I know that I have to drill the bolt holes, but is there anything else required?

is it the pitch on the heads that makes a 351w different from a 5.0? Meaning, will I have to use a 5.0 intake?

Would I be better off just finding e7te heads?

if anyone has done this swap, could you help me out and tell me all I nees to do to make these heads work? I can't find a straight answer.

Thanks!

 

You don't have to drill or change anything. I did this swap a few years ago. Bolt em on torque em down and go. You will nee.d GT40 intake gaskets to match the larger ports. The 351 block is taller and wider than a 302. That's basically the only difference as far as the intakes go in bolting them on.

 

I thought the gt40 heads off a 302 use 7/16 headboard, and the 351 uses 1/2"?

 

They do, but check to see if the 1/2" bolts fit through the holes first before having them drilled.