[mchell]

Originally Posted by yellow1098

So my engine is finally done here is the combo……..
70 4 bolt main block, 461 , compression 10.2, 340 Cfm eheads,, port matched northwind intake, camshaft: 248 intake 254 exhaust 620 gross lift 112 lobe separation.

I am also running a Holley terminator x with a 1300 cfm throttle body

The engine was Dynoed with only a 750cfm carb as they didn’t have the setup to run efi on the Dyno and it made 551 hp and 555 torque at 6500 rpm

When I bought my combo from butler the parts combo was put together with the goal of 650hp so I was about 100hp shy of that

My questions is how close will I get to that with my 1300 cfm throttle body compared to the obviously to small 750 carb?

The goal with the Dyno was only to break the engine in properly before I put it in the car which I accomplished and everything ran great! I just wanted to get your thoughts on how much HP and torque I lost with the engine being under carbed compared to what my goal is.

Thanks as always

My similar combo: less head flow(295 dport), rpm, quadrajet…made 555/577 on the engine dyno. Pulls to 6k. Peak hp was 5800 I believe. Didn’t do a thing to it. Pure tractor motor. Didn’t care if timing was 30-36….You could certainly achieve higher peak dyno #s with carbs/intakes/spacers …cam would certainly help

I swear I just watched a hp tv episode where they installed a butler crate 455….supposed to see well north of 500hp….don’t recall that they were close

Dyno’s……..