Posted By: Torq37
Low block vs raised block factory headpipes - 06/30/20 08:14 PM
If I remember correctly the Walker exhaust catalog of 40 years ago listed the same headpipes for both 383 and 440 dual exhaust applications. Obviously there is a difference in the position of the manifold flange between the two.
Somebody check my math but if the 440 deck is .750 taller that would place the headpipe flange about a half inch higher and a half inch closer to the fenderwells than on the 383 – assuming identical HP manifolds for both engines.
Given that difference I assume the OEM headpipes were different between the two engines? I know some 440’s had H-pipes which would make them different but I’m just asking about standard dual exhaust
Somebody check my math but if the 440 deck is .750 taller that would place the headpipe flange about a half inch higher and a half inch closer to the fenderwells than on the 383 – assuming identical HP manifolds for both engines.
Given that difference I assume the OEM headpipes were different between the two engines? I know some 440’s had H-pipes which would make them different but I’m just asking about standard dual exhaust