headers vs manifolds on a 318 2bbl difference ????

273 said
Dynos are generally dealing with performance engines, usually means higher stall and shift points drops are generally above 3000 rpm. Plus dyno pulls only works well over a fairly narrow rpms so they favor top end.

Not true. If the engine is, let’s say a stock 340 or 360, the dyno can hold the engine and allow the brake at a very low rpm. I have not yet personally seen it under a 2K start point.
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mgoblue9798 said
Seems some forget about that thing called a transmission that has different gears in it. 5500 rpm in first could only be 25mph.

You seem to have forgotten I added the LOL &/or LMAO to help what should be an obvious joke and or sarcasm.
(Thumbs up emoji)