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Steward Performance.

4,500 lb Cadillac with driver and fuel, takes a lot of power to move something with that much mass! Back when I owned a C5 Z06, they were low-12 second cars with only 405 HP. 11.90s on drag radials with a 6-speed manual. They weighed 3,080 lbs from the factory. So it's all relative, modern...

546 HP according to the Wallace racing calculator, which is really reasonable at 512ci. For example, the Charger Hellcat weighs around 4900 lbs with a 200 lb driver and fuel. That's why it takes 640 to the tire to put down a respectable ET (without an incredible 60' time). To put it in simple...

Good responses here, I'm just stating the obvious, where are the 485 HP NET (525 HP claimed) Mopars on the rollers making 400 - 440 to the tire? It's an impossible task to actually know because at these power levels, typically the entire drivetrain is modified. Yes, we can assume near equal...

Yes & no, as the 6.4/392 is rated at 485 (NET) HP and the M6 Challengers regularly dyno around 430 RWHP. That’s around 12% drivetrain loss. Most don’t consider NET HP rating differences when talking about 440’s, everyone says ‘375 - 390 HP’ but that’s not necessarily true, in reality, the...

And you would be absolutely correct.

what a lot of guys fail to realize is these cars were not world beaters, 375 HP gross was barely eclipsing 300 net, and that original 375 HP figure was from a factory selected dyno mule . Glance at the 1972 figures for a more realistic power estimate. Most factory cars would be great to crack...

MSD 6AL-2 will accomplish that, with a locked distributor. It manages the entire timing curve, takes around 5-minutes to make timing curve adjustments. All the owner does is set the mechanical timing, for example, 40* total. At that point, it's nothing more than retarding the timing (x)* for...

That's the ratings for 1971, virtually unchanged from 1970. NET ratings are fairly realistic, that's with the accessory drive, full exhaust, air cleaner, and radiator fan. With a .509" lift / 242* duration @ .050 camshaft, headers, & full-exhaust; I would assume that you will have another...

Well there is a lot of power missing somewhere. Bio, what type of fan are you running? Clutch, mechanical, or electric? Any other accessories, power steering, A/C? Muffler choice? I wouldn't recommend running nitrous on a single 2-barrel plate kit. That manifold is really designed to have...

Combination looks strong, the cylinder heads are holding you back considerably. Are you running an electric fan / mechanical fan / or a clutch fan? What other accessories, power steering / AC? Driveline should be making quite a bit more power to the ground, especially with a 5-speed manual...

They’re making a ‘little bit’ more power though, a full 7-mph difference, so it’s not really an ideal comparison. An increase of 7-mph is more like 60-75 additional horsepower. A12s ran a fairly wide LSA camshaft, and it was dual-pattern. Best advice I can give you, is if you don't own an...

This is a good application for a two step rev-limiter & clutch-tamer. Look at it this way, the Challenger M6 Hellcat makes over 600-rwhp from the factory, remember that fiasco when they were released, very few owners were able to even break into the 11.9X range while the 8HP90 cars were running...

I would be more impressed that a car is running 11.7 @ 113 MPH (rather than 116-118 MPH), shows the chassis is fairly sorted out. MPH is derived mainly off actual RWHP (to be more exact, power to weight). You may be surprised at what you'll see on the chassis dyno, actual engine power...

6AL-2 will provide you with programmable timing curves. Great for a street car, don't see it serving a purpose for your application.

Hey Rumble, of course, I didn't take it any other way (difficult to tell on the internet), more or less trying to say there is no guesswork about it being the best anymore for max-effort builds. It's a fantastic intake, best intake by far OOTB for our 'B' engines. Like you said, it really...

There is no think about it, the TF intake is the best 4150 low-deck intake OOTB for a max-effort build. Check out some of AndyF articles on the 470 dyno-mule. It even edged out the M1 4500 manifold until it was ported by Wilson. Now, on a low-performance or typical factory iron head build, I...

I wonder if that is the same manifold? From what I've read over the years, the 'B' M1 single plane was discontinued. Only the RB model remains. The dominator-flanged M1 version is part # P4529724 https://www.summitracing.com/parts/dcc-4529462 That would be great if they are available again...

Not sure the last time anyone looked for the 'B' series M1 intake manifold, but it's one of the toughest manifolds to come across. Two or three years ago, it was hard to give these away. Now it seems, everyone wants one to complete a 400 low-deck build. $250 seems like a good price to place...

So about a 12-15hp difference in a 400hp build :moparsmiley: He has 40-more cubes, that should make up the difference.