What Year Is This Exhaust Riser Valve??

[John Morris #23947]

Can someone tell me what year this juicy little part is??

[D.Yaros]

Since it looks different from the one on my '55, I am hazarding a guess at 1953?

[Jeff Maltby 4194]

Here's my oem 49 heat riser.

[Misfit]

The counterbalance is positioned outboard over the spring, whereas the part in question has it pointing toward the flange. The 49 part might be an improvement made for clearances.

How about one earlier than '49 for comparisons?

Fins

[Jeff Maltby 4194]

If I remember right, flatheads diid not use a heat riser valve ? What car is this from John ?

[John Morris #23947]

I found it in a "box of doom" meaning I put it there years ago. I have parted out 49, 50, 54, 56, 57, 58, 59, 60 Caddys. No 48 and older, no 51-53.

[Otto Skorzeny]

That leaves 58, 59 and 60 and maybe 57