6a vs 7a

[Bulletproof937x]

My 86 Olds has a 307 with 6a heads. Will the intake from an engine with 7a heads work on my car?

 

[olds307 and 403]

Yes, the intake ports are identical. The exhaust ports are a different shape but manifolds should still bolt on and seal. I believe they are similar to the 5A heads vs the smaller round ports.

 

[Bulletproof937x]

Thanks for the info. My car has the 6a heads but my intake is cracked. I found one for 7a heads close to me, I just didn't want to waste my time.

 

[fleming442]

Intake fitment is the same regardless of heads. What you need to pay attention to are the emissions doo-dads. All small block Olds intakes from 67 and up intechange.

 

[Bulletproof937x]

You guys are incredibly helpful. Thank you

 

[olds307 and 403]

Intake fitment is the same regardless of heads. What you need to pay attention to are the emissions doo-dads. All small block Olds intakes from 67 and up intechange.

They do bolt on but 260 #10, 2A and 307 6A and 7A heads have tiny ports in different spots. The 260 have the ports near the top, the 307 in the middle. I actually think the 260 ports are in a better spot. Wow, I think that is a first, the 260 isn't better compared to anything.

 

[87National]

Thanks for the info. My car has the 6a heads but my intake is cracked. I found one for 7a heads close to me, I just didn't want to waste my time.

I have an aluminum intake from an 86 442 with 7A heads for sale.....if your local deal doesnt work out.