340 manifolds outlet size?

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bighammer

bighammer

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I bought a "matched set" of 340 exhaust manifolds and to my surprise and disappointment one side is only 1 7/8 outlet. The other side is 2 1/4. When I saw it I told the seller he gave me a wrong side, he says no, that is a factory numbers matched pair.

Why would Mopar do that? Won't that make the engine off balanced? I had planned on running 2 1/2 full exhaust.

Thanks

Mark
 
i thought both sides were 2 1/4".. have you checked the part numbers to make sure they are both 340 manifolds?
 
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bighammer said:
I bought a "matched set" of 340 exhaust manifolds and to my surprise and disappointment one side is only 1 7/8 outlet. The other side is 2 1/4. When I saw it I told the seller he gave me a wrong side, he says no, that is a factory numbers matched pair.

Why would Mopar do that? Won't that make the engine off balanced? I had planned on running 2 1/2 full exhaust.

Thanks

Mark
Click to expand...

Mopar Didn't mismatch manifolds, I think your seller did. The 68,69 and 70 340 HP Manifolds that I own both have 2 5/16 outlet opening measurements. I'm about 99% certain that the newer HP Manifolds (71/72) should both have the same 2 1/4" outlets.

Russ
 
340 1968-70 A, E-Body, Right 2863549
340 1968-71 A-Body, Left 2863553
340 1970 E-Body, Left 2863553
340 1971 B, E-Body, Left 3418621
340 1971-73 A, B, E-Body, Right 3418623
 
If that's the ad, unless it was changed, it's pretty clear what was for sale.

Like bbrroowwnn says, you need the early drivers or later pass side to match them up.

$250 is a great deal for those two manifolds.

I bet he used that POS chart that another person posted in the tech section that has a bunch of wrong cast numbers for 340's. According to that list, they are matched... but, the list is WRONG!!!
 
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