69 427 Heat Riser Valve

[Wes G.]

On my 69 (427/L71) I found a heat riser valve with B392442 stamped on the counter weight. The B maybe a 3 ?? Reading on this forum I see the GM part number for this heat riser should be 3969903. Can anyone explain these numbers I found on my heat riser valve? Thx Wes

[Joe L.]

Re: 69 427 Heat Riser Valve

On my 69 (427/L71) I found a heat riser valve with B392442 stamped on the counter weight. The B maybe a 3 ?? Reading on this forum I see the GM part number for this heat riser should be 3969903. Can anyone explain these numbers I found on my heat riser valve? Thx Wes

Wes------


Numbers found on the counterweight represent the casting number for the counterweight and not the part number for the heat riser valve ASSEMBLY. Heat riser valves do not have the part number for the assembly to be found anywhere on them. The 1969 big block heat riser valve was unique to 1969 Corvette big blocks. That's because 1969 was the only year Corvette that ever used a 2" exhaust for big block applications.

[Wes G.]

Re: 69 427 Heat Riser Valve

Thanks again Joe for sharing your corvette knowledge in a timely fashion. The GM part number I referred to in my post was taken from one of your earlier posts. Wes