Thread: Will 4.6 heads bolt onto a 3.9 block?

Yes.






JC

Thanks for the quick reply,

I thought they would, but just read something that put a bit of doubt in my mind.

But best with composite gaskets.
Regard sPhilip A

They may not have the holes for the 4 outer bolts. Mine don't but my 4.6 block has holes for the bolts (which it shouldn't have).

Originally Posted by p38arover

They may not have the holes for the 4 outer bolts. Mine don't but my 4.6 block has holes for the bolts (which it shouldn't have).

96 D1 hasn't got the outer bolt holes in the heads either. Most Early non Serpentine belt 3.9's (pre 'MA' VIN) in early D1 and RRC did have the extra row of bolts.

JC

Originally Posted by Siska

As the title really.

Will 4.6 heads (P38) bolt onto a 3.9 (96 Disco) block?

what gains are going to come from the swap??????? Valve size larger???? better flowing heads???

Doesn't the 4.6 have a bigger chamber capacity than pre serpentine 3.9's????
This is going to drop the compression from the already low 8.13:1 on the 38D engines.

Cheers

Andrew

Originally Posted by LOVEMYRANGIE

Doesn't the 4.6 have a bigger chamber capacity than pre serpentine 3.9's????

No .