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I just want to know how! How is this 416 making 100 hp more than any other 416? I have scoured the internet for dyno results, and they all have 416s making roughly 605-620 hp with aftermarket heads. Most of them have AFR LS3 heads. I believe GPI is using the Brodix BR3 heads. I’m a cheap ***, so I had planned on using stock, ported LS3 heads. Now, I’m thinking aftermarket heads might be worth it for an extra 100hp.
200psi of cranking compression, torque peak at 5500, power still hasn't peaked at 7200, carburetor, single plane intake, doesn't like to idle, no accessories, its running well but not crazy. It has plenty of cam and compression.
This isn't that crazy of a dyno pull. This isn't a grocery getter street motor, thats for sure.
From: Halfway back on the Highway to Hell...again!
I'll also agree with it's carbed and no FEAD. Also, that's some good numbers but really not that hard to do. All it takes is money and the right combo of parts. I will guarantee the LS3 heads are maxxed out and that big single plane intake is making some steam. That also is not your typical off the shelf carb. Willing to bet that carb is about a $2000 finely tuned piece.
Here is Steve Balusiks build. He street drives this motor in his Nova. BTW, Steve works for Cam Motion. So if you call them, He may be the one that answers. He is one of the sales reps and is one of the best. https://www.enginelabs.com/engine-te...ild-with-ffre/
My 402 made 662 with a FAST LSXRT intake on pump gas with less than 250* duration and 235cc cathedral heads. We later added a GZ vacuum pump and made 680s. No exotic parts. It's definitely not cheap but it's not a wild combo either.
Funny this came up. I just saw a video this morning about a 416 that put down 600whp through an auto and slicks on the dyno. They were testing the Holley dual 4500 TB lid and picked up 70whp over the standard holley lid. I didnt look back to see what the exact combo was. All I know is they were saying it was a 416 with cathedral heads.
Funny this came up. I just saw a video this morning about a 416 that put down 600whp through an auto and slicks on the dyno. They were testing the Holley dual 4500 TB lid and picked up 70whp over the standard holley lid. I didnt look back to see what the exact combo was. All I know is they were saying it was a 416 with cathedral heads.
I wasn’t looking at the carb setup. It made over 730hp with a MSD intake. I know those are good intakes, but it’s a long runner. I have seen 440+ CID engines with a short runner intake that made less than this 416 with the MSD.
I doubted the engine dyno results until I saw the video of her car on the chassis dyno. It made right at 600 Whp, so the 730 crank sounds accurate.
Basically, most of the low 400 cube motors (400-416) are lack luster combinations. Stock ls3 heads or ported 243/799 combos. Stock or fast manifolds. 11.5:1 or less compression. Cam that is meant for stock cube cars that just gets it's dick kicked in from the cubes. Ls7 lifters and bouncy valvetrain that is heavier than hell over the nose (making that already small cam even smaller with the duration/lift lost from the unstable valvetrain).
It ALL adds up really quick. When I set off on my 408 build, I wanted to correct all of this. I haven't gotten the chance to see what it makes yet, or how it performs, but I know that I won't be disappointed from not turning over every stone. The only thing I could do differently to my combo at this point is move to an LS7 head from the cathedral ports that are on it. But I will wait to make that change till I know I am bored of this and want even more.
She’s using a small bore LS7 style head. She said the gwatney performance 2.0 max package was being used. All the specs can be found so nothing special. I’m sure that MSD would have done better if it was ported.
Last edited by jasons69chevelle; Oct 20, 2023 at 07:58 AM.
She’s using a small bore LS7 style head. She said the gwatney performance 2.0 max package was being used. All the specs can be found so nothing special. I’m sure that MSD would have done better if it was ported.
Yeah, a ported short runner msd would do real well on that motor.
She’s using a small bore LS7 style head. She said the gwatney performance 2.0 max package was being used. All the specs can be found so nothing special. I’m sure that MSD would have done better if it was ported.
This. The GPI Max 2.0 package is an LS7 port for smaller bores. The power is not at all surprising as you aren't far off from a standard LS7 build at that point. And with the MSD sitting on a tad less cubes, i bet its even happier up top, where it tends to fall off on 427s
Very easy to believe and seems on point from that shop. That is very nice power through a 4150 carb and Victor manifold.
I did one that performed pretty well. 416", Mast 255 CNC LS3, 11.6:1, 25x/27x @ .050" hydraulic roller, CID 4.0, 950 Ultra XP https://www.dropbox.com/scl/fi/gmdf6...ecta0yj7h&dl=0
Last edited by helicoil; Oct 20, 2023 at 05:41 PM.
good flowing heads, short runner intakes, cam and compression and lots of RPM will do it. Also its an engine dyno, no accessories and in a controlled environment with controlled water temps. For an example, i built a 12:1 402 with tfs ls3 heads, hyd roller 242/256 cam and a mid runner fast, nothing special. Chassis dyno with 28x10.5 slicks and a loose converter that wasnt locking up and it made 530 wheel @ 6900, run aborted due to tire wrap, and power was still climbing. Mathematically thats close to 700 crank and we couldnt even bring it to peak power, and i had a bad lifter on that pull, dunno if it affected results.
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700+ hp 416? 
