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took mine out this fall. 71 250 same manifolds, gearhead friend of mine says may cause vapor lock in the summer time due to carb over heating ( no heat deflection) if this happens he suggest putting a plate with holes drilled in between manifold to deflect some of the heat. i also bolted the manifolds togeather and had ports milled down at the machine shop, i got a great seal after that with no leaks( very quiet) just make sure you dont crack your exhaust manifold, those babys are very rare. let me know how it turns out.
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