Manifold question

[ShawnAgne]

I was looking on Steiner and they list two manifolds for the F300, not that I need to replace mine but was late at night and was bored. One is listed as a performance manifold if you have the correct carb, which I do. Just wondering what the actual difference is. I'm assuming either one would be ok.

 

[KETCHAM]

I think its the carb mounting....space between the two carb mounting bolts.....I had to measure mine for my H...My manifold had a hole between the intake side and exhaust side...Every year it got weaker and weaker...A couple of guys at the pulling track told me the they rust out....Mine did...Replaced it...Runs great!!!!!