I've done the research on this but not sure if I'm missing something. The TTI ones are too expensive and also they are bigger tube diameter (1 7/8") than I want. I've Seen a few messages on the poly 318 yahoo group but they are minimal, no finished stories or pictures that I could find. Haven't found much on here excpet people saying its too much trouble.
I'm leaning toward this options. I hear the new 1990's 5.7 L gen 3 hemi headers have identical port spacing (the flanges could be cut out and replaced with proper ones) They would fit on the head. But my questions are would they clear the power steering pump? That's seems like my biggest clearance obstacle but I haven't heard much mention of that. It seems people mainly worry about clearing the motor mounts and oil filter. Do people even attempt this in the b body ? Or do the people who try this have early poly pickup trucks with more clearance? Was thinking of trying these.
https://www.summitracing.com/parts/psm-70-1374/make/dodge
Or if I become convinced the modification avenue is impossible I may try to make some that will fit from scratch with 1 1/2 or 1 5/8 tube. I don't even care if they are a little funky as long as it's an improvement from stock manifold. Does anyone know more about this picture I found online? Seems like someone made some... question is do they fit? If so I'd probably try to copy them.
View attachment 678776