Magnum Heads On 340
Just food for thought, but make DARN sure that there's no interference between the downleg of the manifold (esp. driver's side) and the head. I have a Magnum slated for install in a '68 Dart, and when I mounted up the early 340 manifolds, the driver's manifold outlet was hitting the bottom part of the head. It wasn't a huge amount, but enough to probably prevent the manifold from sealing no matter what gasket was used; and I'm not a fan of doubling up on gaskets. I ended up sandwiching a header flange between the manifold and the head, which took away the interference. I didn't see any interference on the passenger side.
No pics of HiPo manifolds on a Magnum right now, I'll see if I can get some next time I'm at the shop.
What I DO have is a pic of an early A manifold (I know it's not the same, but it illustrates the point of interference) on a Magnum head.
Ignore the chunk out of the manifold. That's the result of someone tightening down the manifold on a set of later LA heads which also interfere. Ka-tink.
Something I've pondered doing, but haven't actually tried yet; is to try to find some 318 port-sized header flanges, which more closely resemble the Magnum port sizes. A little quality time with a die grinder should match the flange up to the port of the head, and the extra material of the flange around the ports should allow the 340 manifolds to seal up just fine...
Just food for thought, but make DARN sure that there's no interference between the downleg of the manifold (esp. driver's side) and the head. I have a Magnum slated for install in a '68 Dart, and when I mounted up the early 340 manifolds, the driver's manifold outlet was hitting the bottom part of the head. It wasn't a huge amount, but enough to probably prevent the manifold from sealing no matter what gasket was used; and I'm not a fan of doubling up on gaskets. I ended up sandwiching a header flange between the manifold and the head, which took away the interference. I didn't see any interference on the passenger side.
No pics of HiPo manifolds on a Magnum right now, I'll see if I can get some next time I'm at the shop.
What I DO have is a pic of an early A manifold (I know it's not the same, but it illustrates the point of interference) on a Magnum head.
Ignore the chunk out of the manifold. That's the result of someone tightening down the manifold on a set of later LA heads which also interfere. Ka-tink.
Something I've pondered doing, but haven't actually tried yet; is to try to find some 318 port-sized header flanges, which more closely resemble the Magnum port sizes. A little quality time with a die grinder should match the flange up to the port of the head, and the extra material of the flange around the ports should allow the 340 manifolds to seal up just fine...