At around 3900lbs, 99mph to 104mph shows about a 55hp gain.
I guess I’ll have to add it to my long list of things I’d like to try on the dyno someday.
We rebuilt a 440-6 to basically stock specs last year.
2355 pistons, rebuilt 906’s(zero porting), felpro head gaskets, heads just milled the minimum, but it got a Howard’s 720141-12 cam(279/289, 225/235-112, .490/.488), and it was dynoed with 1-7/8” headers but without the air filter assy.
Made 410hp.
Mopar Muscle did an article on one about 2 years ago, pretty similar build, used a Comp 270h cam, made basically the same power.
my r/t weighed 4060lbs with me in it weighed at the track. with the last combo I had in it I believe horsepower was in the 410-415 range with 107.5-108mph trap speeds. ironically on the chassis dyno the engine was pretty much done at 4300rpm and fell off the cliff at 5300rpm. I shifted around 5200rpm. fuel delivery is a big deal with the 6pak. I do believe the kb184 piston makes more power than the stock 2.03 pin height 10:1 piston.
