v8 heads and inlet manifolds..explained

[adam perth]

i will be getting back to this post as soon as i have the time to take pics ..:eek:

i fly home next week and should actually have some spare time
i have a HT / HG 4 barrel inlet with a 281xxx part number, so that would make 6??
i have a pic of it.
here it is (edit)

[agr071]

In regards to heads:
The VN heads (that i currently have) don't use 2 bolt holes in the valley of the block. (usually has 2 short bolts).
So is it possible to run early heads on the motor and not use these 2 holes, or is there a specific reason for these 2 bolts?

[L31 Sandman]

You don't need those 2 bolts, throw them away! If you use those 2 bolts make sure you only tighten to first Nm level otherwise you break the thread away in the block. I know i broke my block. When I said to my engine builder OOPs, he just said throw the bolts away. That was a 400hp 308 in a Torana and never gave me grief, well no issues with the bolts not in anyway.:geegee:

[Dago]

You don't need those 2 bolts, throw them away! If you use those 2 bolts make sure you only tighten to first Nm level otherwise you break the thread away in the block. I know i broke my block. When I said to my engine builder OOPs, he just said throw the bolts away. That was a 400hp 308 in a Torana and never gave me grief, well no issues with the bolts not in anyway.:geegee:

I broke mine too and had a perfectly good 308 sit in the shed under a blanket for three years until I was told. :errf:

[HK1837]

i fly home next week and should actually have some spare time
i have a HT / HG 4 barrel inlet with a 281xxx part number, so that would make 6??
i have a pic of it.
here it is (edit)

Adam is correct, HT and HG inlets are different to HQ-HJ but only by a hole for a heater hose - that is what the blank boss is on the water runner coming from the passenger's side front towards the thermostat. If you look in the picture you can just see the round boss above the thermostat cover. As this one isn't drilled it is a HQ-HJ or LH-6/76 LX manifold.

[agr071]

Will my red pollution manifold fit VL heads as i'm interested in these because they are on unleaded?

[commodorenut]

Will my red pollution manifold fit VL heads as i'm interested in these because they are on unleaded?

I know this is an old thread, but it hasn't been answered yet.
Simple answer is a no - the exhaust crossover ports are different (and so are the bolt holes around them).