Jun 20th, 00, 10:55 AM
I have just built a 454 and am curious as to what you guys think how much hp and torque it may make. here are the specs, 454 bored .030, 10.5-1 comp hypereutectic pistons. moroso 8 qt. pan with windage tray and matching pickup. the moly rings were file fit for each bore. cam is an extreme energy 274(.559-.563in-ex,230-236 dur@50w/1.72 rockers).all valvetrain parts matched comp cam pieces. heads are 781 oval port that have been cc'd(117cc), bowls cleaned up, and 2.19-1.88 stainless valves installed with a 3 angle valve job. intake is performer rpm with an 800 holley dp.the exhaust heat is blocked and a lifter valley pan is installed. for ignition there is a mallory unilite w/MSD 6-AL. the whole rotating assembly was balanced. I also have a rebuilt turbo 400(manual valve body and a trans specialities 10" converter w/antiballoon plate. the guy who built the motor claims 500-510 hp@5500rpm and 530 torque@3500. thanx in advance
Jun 20th, 00, 11:15 AM
My guess: He's probably close assuming you have headers too. Give or take 15 HP I'd say that's sounds about right.
1969 Z28, 406SB
Jun 20th, 00, 06:35 PM
I ran your combo through desktop dyno, assuming open headers and a cam LSA of 110 here are the numbers
hp= 528 @ 6000
tq= 514 @ 4500
That'll work! http://www.camaros.net/forum/smile.gif
406 sbc in the works
Solid cam 228 @ .050
Edelbrock Torker manifold
Jun 21st, 00, 05:42 PM
I find the desktop dyno a little on the high side as much as 10% compared to some actual dynos friends have done.
I have a 427 with Perf rpm heads just over 11/1 pistons similar cam Victor Jr intake 850 dp roller rockers same valves windage tray also and a friend dynoed the same combo with 2" headers just over 530HP and 495 torq.if that helps any.
Jun 23rd, 00, 01:02 PM
I ran your combo through my Dyno2000 and came up with 543hp at 5500 rpm, 563 lb-ft at 4000 rpm with an open set of small tube four into one headers.
Please note that Dyno2000 doesn't differentiate between Performer and Performer Rpm manifolds, as well as the design of the timing ramps on the Extreme Energy cams which tend to make them produce better power and throttle response when compared to the older design single profile cams. I have a feeling that these numbers are a little high but thats all I have to go by. pdq67
Jun 23rd, 00, 01:19 PM
Sorry about it but I put a solid cam in your Dyno2000 run instead of a hydraulic. I've got solids on the brain because I'm going to run a Comp Cam 282S solid in my engine.
Anyway, here goes again with a hydraulic cam. 514hp at 5500 rpm and 540 lb-ft of torque at 4000 rpm. as you can see the solid cam will make a little more hp than a hydraulic because it can "knock" the valves open a little quicker. But solids are noisier and they have to be set periodically. pdq67
Jun 25th, 00, 07:34 AM
thank you very much to all that replied. my older version of desk top dyno was close to your predictions. for some reason that program has been pretty accurate for several engines i have had a hand in building. the worst it was off was by almost 4/10's but it was a 10 sec. race car. good luck
1969 chevelle SS 396
Jul 7th, 00, 08:48 PM
Depending on what the heads flow I'd say you're making somewhere between 460-480HP. And about 500ft/lbs