We just finished a dyno session with a second hyd. roller 482 street motor. The previous was a stage 2 SE head flowing over 330cfm on intake and 10.9 compression, SP1 intake. The one we just did was a stage1 SE with the flow on intake 5cfm better, same cam hyd roller specs, 10.9 compression, same pistons and rods, Wildcat intake, same 4150 carb, 34 degree adv. timing, same roller rocker at 1.60, internal balance. Motor 1 tq hp Motor 2 tq hp 4200 563 450 554 443 4400 581 487 573 480 4600 597 523 590 517 4800 605 553 600 548 5000 603 575 602 573 5200 600 594 601 595 5400 591 608 593 610 5600 579 617 579 617 5800 565 624 563 625 6000 549 627 550 631 Both peaked at 6000rpm on hp. They pretty much traded licks with a slightly different combo, but both will be strong street contenders on pump gas. gary
Hi Gary, good see that your back. I left everything at John's, trk-trl-car. Thier all for sale separate... Your friend, Sam
Thanks Sam, have a great and healthy New Year. Wish I couldv'e seen you at BG, how'd you do and what did the car run? gary
dont know why this should be surprising, sounds like the only major difference was the intake itself and exhaust port configuration. and clearly the port configure wasn't a down fall at this level. and at 6000 rpm the sp1 isnt out of breath yet.. I would had been surprised if the were not almost the same
Ben, said interesting not surprising, I have the same conclusions, I think the cam specs started to level out the hp at 6000 due to our desire to be streetable with vacuum. If we didn't care to much about that premise both manifolds would have continued to perform into 6500rpm or more.
those are beautiful numbers, over 500 tq from what has to be down in the mid to 3000s to well over 6000 is a perfect street motor. with the parts I know you have in them 6500 should be no issue at all. heck those are low 11 second quarter mile power level that you can go to the grocery store or kids ball game. just awsome
sounds like a hemi and mustang killer combo of a street motor, should make someone's buick very very happy when they unleash it
So with the 2 1/8 headers that most people run on Stage 2 the powerband would move up some on the Stage 2 heads and pull to 6500 whereas the Stage 1 heads were likely all done at 6000, right? It is interesting that to 6000 they are so close with 2in headers.....
Probably, didn't use bigger because the customer was using 2" on the street. Motor 2 flows 5cfm more on intake and used a Wildcat, I think thats what kept it in the game and actually did better in upper rpm.
I'm sure at 6500 there would be a little variation in the 2 and I guess it would be intake related based on the runner volume of the wildcat intake. was always told that it did better upstairs...........but most "street" motors are not there and on the track I bet your only talking a few hundreths. either way it equals tons of tire spreading buick kicking butts fun
