PDA

View Full Version : head swap



Chuoiz
06-28-2005, 04:26 PM
I have an 86 a20a1 and I'm wondering if I can swap on a different head say the a20a3..would it be a direct bolt on and would the power be different...

Vanilla Sky
06-28-2005, 04:56 PM
same head

Nice Guy Neil
06-29-2005, 09:24 AM
Well, the A20A3 has a bit higher compression, so they're not _completely_ the same, just very close.

But no, the power would be pretty much the same, the real difference is in the EFI.

SteveDX89
06-29-2005, 10:07 AM
Well, the A20A3 has a bit higher compression, so they're not _completely_ the same, just very close.

But no, the power would be pretty much the same, the real difference is in the EFI.

The difference in compression has nothing to do with the head. It's in the pistons.

smufguy
06-29-2005, 11:04 AM
the only difference in the head package compaing the a3 and the a1 is that the a3 has a better camshaft (higher lift) and the a1 has longer exhaust valves. so if u had a a1 head with a a3 camshaft, you will see a nice power increase like Alex.

Chuoiz
06-29-2005, 01:18 PM
is there a difference between the a1 efi and the a3?

SteveDX89
06-29-2005, 02:41 PM
is there a difference between the a1 efi and the a3?

a1 is not efi. it is carb.

b8er
06-29-2005, 03:09 PM
best bet, do what smufguy said and switch the cam

NXRacer
06-29-2005, 03:28 PM
you're not completely right steve-o. the volume of the head can change compression homie. i thought you knew that! :D

no head swap will do you any good. better to take the money you'd spend on a 'head swap' and get yourself a good head job done on the a20 head.

Vanilla Sky
06-29-2005, 04:26 PM
nope, the valves are all the same, and the head casting is the same between the A1 and the A3.

SteveDX89
06-29-2005, 05:04 PM
you're not completely right steve-o. the volume of the head can change compression homie. i thought you knew that! :D

no head swap will do you any good. better to take the money you'd spend on a 'head swap' and get yourself a good head job done on the a20 head.

I did know that. I'm just talking specifically about a20s.