did the 69 h/o with air have a heat riser valve in the ex manifold? also would anyone know the center to center drive shaft length? thanks in advace.

 

thought all 69s got the heat riser valve in the exhaust manifold. but yes is the answer to your first question

 

I was just thinking the same thing the other day. Mine does not have it. But I do not kow if it should or not. If it is spose to have one .......I'm not sure if it would work? Then again maybe it could?

Joe?

Jeff?

Wmachine?

 

it should have one. I have the benefit of seeing a senior preservation winner car darn near anytime I want. I've even taken it down the strip at the Pure Stock Drags. It's an a/c car and has the heat riser for those curious. If it's the Jeff I think you are referring to, he knows this car too

the W/Z, 69 was the only year the driver side had the heat riser valve. the 70-72 did not have it. other than that the W/Z manifolds are the same.

 

"Driver's side"????

 

I saw a set at the Monroe swap meet with the heat riser on the drivers side for a $100.00 last weekend, almost bought them, now I wish I had

 

The learned Wmachine jes straightened me out. I was thinking heat riser. [To the snorkle] While ya'll were talking exhaust heat riser.

Sorry, I stay a might confused.

 

Does this also mean that the 68 H/O with AC should also have this heat riser? Same as 69 H/O? It doesn't look like it would fit with AC bracketry in the way.

 

'68 442s with AC have a snorkel that points more toward the front of the car to clear the AC brackets. But the '68 H/O has a much different air cleaner. Never the less, the '68 *should* still have a "stove pipe", but someone that knows for sure would have to confirm that.

 

The 68 and 69 big block a-bodies (442, H/O, and Vista) had (almost) completely different heat riser assemblies by year to go along with the different manifolds they used.

The 68 assembly had a common shroud all the way around the exhaust manifold, a common stove pipe and a different second adapter depending on whether it had a/c or not. While the W30 and H/O had a different air cleaner, they shared the whole riser assembly with the 442 (and a/c vs. non-a/c).

For 69, there was a completely different (simpler) shroud and then a single pipe (except for the W30/W32 cars which had a unique stove pipe and the same second adapter used on the 68s). For 69, the H/O used the same setup as a regular 442.