tunnel ram

am running a 347 ford 471 hp at 6500, running a 650 dp now/going to a tunnel ram wondering should i use the 450 holleys or the 600 tks Butch car is 2600lb 4000 stall

 

Assuming 85% volumetric efficiency my math says you're flowing 554.7cfm at 6500rpm. Even at 100% ve two 450s are way more than you can use.

 

A pair of 390 CFM's = 780. On par with your combo. Experts, what do you think?

 

^^ what they said.

 

A pair of 390s or if you can find them a pair of 400cfm carters from a Buick.

 

I'm running duel 450's on my 289. I shift at 7800.
When building the engine we called Holley with all of my engine spec's and they even suggested running the duel 450's.
It's worked really well for my combo

 

tks Butch