Hi. Need to find a source for a replacement of the exhaust manifold heat
riser spring (only) on a '57 235 Chevy inline 6.
(Heat riser valve goes in between the intake and exhaust manifold. It has
butterfly plate with a counterweight on the other end of the shaft and the
coiled bimetal spring on the other end)
I've checked the usual online classic truck dealers but no mention of this