[QLD] Vn heads on vr

[Tylerwatson]

So I have a vr commdore with the Buick and was wondering if vn heads would work on my vr as I need to rebuild them but found reconditioned heads off a vn for cheaper

 

[Whiteshark68]

vn heads are different to the later heads i had a vp calais that was duel fuel and gas killed the heads even though they are supposed to fine and couldn't for the life of me find a set of vp heads so went to the local engine re-conditioner and bought what was supposed to be a set of vp heads only to find he had to get them in but the numpties sent him a set of vn heads and they do technically fit but there is a hole in the vp and later heads through to the inlet manifold that isn't in the vn heads i had to wait for the engine guy to machine said hole into the new heads.

Not sure now if it was vacuum or coolant now as this was 16 years ago

 

[Immortality]

That hole is for the PVC system (but yes, you are correct).

I'm sure the hole placement isn't critical, could probably drill them by hand if desperate. I think the later heads also flow a little better than the VN ones IIRC.

 

[Tylerwatson]

vn heads are different to the later heads i had a vp calais that was duel fuel and gas killed the heads even though they are supposed to fine and couldn't for the life of me find a set of vp heads so went to the local engine re-conditioner and bought what was supposed to be a set of vp heads only to find he had to get them in but the numpties sent him a set of vn heads and they do technically fit but there is a hole in the vp and later heads through to the inlet manifold that isn't in the vn heads i had to wait for the engine guy to machine said hole into the new heads.

Not sure now if it was vacuum or coolant now as this was 16 years ago

Do you know if Vg Buick heads will work?

 

[losh1971]

I think the later heads also flow a little better than the VN ones IIRC.

Yeah I think you're right. When I had the VR there was something about later heads flowing better, which is part of the reason the VR made more HP.