Headers vs 340 manifolds

a-bodyguy said
340s dont pick up 5/10s from headers maybe a stock big block gets 35 hp if the manifolds or the exhaust is 1 7/8 and suck
5/10s across the board total bs

Read again, not "across the board", said "up to".

When I install headers, I tune it as nec, make other changes learned thru experience.
I have absolutely no idea what conditions their base was set.

But after years and dozens of cars coming back saying they picked uptime, some 2, some 3, some4 and yes 5/10s.

Did I verify all these dozens of cars, of coarse not, but the resulting happy customers speak volumes.

Maybe your cars woulda picked up more time with a different driver?