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Just took a look for that video--It's the 383 6-pack video. So even with that non-optimal 6 -pack manifold that engine made close to 500ft/lbs and 430hp with the 3.75" crank. I think I'd choose 110ft/lbs / + 90hp if I just had to keep a 383 block under the hood for some reason or other. J.Rob

This is correct. So we have a short stroke engine that needs engine speed(piston speed) so Mopar puts a restrictive intake on it that checks out @ 5000-5500 rpm , along with a hydraulic cam that is designed to work from 1400-5000rpm, lets also put cast pistons that weigh a hundred pounds and...

Holy Smokes Dwayne! This is some Twilight Zone stuff , had a similar experience. Shop I was at was commissioned to build a SBC 400 for a guy with a stepside pickup. He wanted it Chevy Blue as it was real close to the colour of the truck. Anyways we used some nice forged Speed-Pros, CS179 cam (it...

I have a couple of very similar experiences with a 396 and a 402 (bigger 396). Both were mutts and I kind of lump them in with the BBM 383/400 category and I find you even have to build them with the same kind of "recipe" . Thats a great story Dwayne and yes a solid lifter cam is always a go to...

Yep it mimicked a stock resto 383 I did about 20yrs ago, 325hp/380tq on a SF-901. Prior to that I worked at a shop that we did a 383 for a beautiful '67 Belvedere , we never dynod it but it was such a slug that we wound up trying a different cam with no noticeable change. Hence my disdain for a...

No manifolds, that's with an admittedly large dyno header. J.Rob

No argument at all Dwayne thats a nicely hotrodded 383 and it still barely generated the 425 ft/lbs Nick is still searching for. My original post stated stock 383's/400's are giant P'sOS. J.Rob

Look at all that torque. This was one of those customers that just wanted to cruise and said he didnt care about performance at all because he had a new Challenger 392 that he played with at the strip. Last I heard he sold the R.R. that this 383 powered. It must've been so impressive he decided...

Define power and then we can narrow this down. J.Rob p.s. Don't care about any chain yankin, I live in Onterrible where my chain is yanked more than the NY Yankees, im also married.:lol:

Oh it is the POS 383 engine designs fault--it will just take a bit more time for Nick to arrive at that conclusion. Oh and if youre referring to me as the "resident guru" that said they were all Pieces Of ****--I stand by that statement and emphasize a stock 383/400 is a POS. Next time I'm at...

Your post compelled me to go watch it--Damn you Dwayne-lol. Yes Nick has a VERY nice looking Rottler-SGM but I have only seen it in his videos once or maybe twice. After watching it-Nick seems to be thinking the seats are sunk, but I cant imagine resurfacing .020" off the decks and not doing...

What did you swap to? J Rob

This might be thee most wishy-washy response I've ever seen. J.Rob

You are always on my case..not sure why. Maybe I'm just that Lil Ole bee in your bonnet. J.Rob

Whats really interesting is when you mount the turbine on top of the T-ram carb enclosure--What would you expect the CFM to read? J.Rob

Exactly what Nick should have done except you need a VERY special adapter to "stack" them one on top of the other in order to use the stock manifold. All kidding aside the 850 doesn't really work all that well on just about anything due to the venturi/throttle bore sizes. Take a good look at...

It is without a question a 600VS and the secondaries were barely opening NOT a 750vs. The fact that putting on a high flow 750dbl didn't make much of a difference is a testament to how little air that big block was moving- then again had he ever used his dyno air turbine to measure he would have...

Apples to fake moon rocks. J.Rob

Your warmer than most but its really the stroke (piston speed) that is the culprit along with low compression in most cases. J.Rob

400 is the same slug as the 383 should run even worse with a dumpr cam. I never built a 2bbl bigblock so? J.Rob

1. Yes full service machine shop/dyno service. 2. I know this but 383 cubes is still 383 cubes. It's still a benchmark to highlight just how poorly the 383 performs. 3. NC 4. If it causes hate then thicker skin is needed--I was bored and responding to Nick's obvious confusion on where the...

If I see something that needs to be pissed on I piss on it. The 383 Mopar is just that in this case. Guess you don't like the truth--which is the same as piss. J.Rob

First off I despise 383's possibly more than the 318. The 383 has no right to call itself a big block. I've built more than a few and they always disappoint. ALWAYS. I've actually been refusing to build them if the customer wants a " stock rebuild, im only cruising, don't care about performance"...

Also--I use a crank shop near me in Quebec for my balancing needs and from time to time I get them to grind or in some cases index/offset grind certain cranks (He is so much better than me at it) and for what he charges to offset grind isn't a quarter of the cost of a good new crank. I'm not...

I can't speak for the OP but in my case... I did it because I have a crank grinder and I had a 383/400 steel crank on hand and I wanted to build something unique for my buddy and I've always hated the stupid 3.375" stroke and I made the stroke to fit the piston and rod selection and I like the...

There is no factory hardening, unlike most diesel cranks. Have offset ground many cranks , never an issue. The 3.915" stroke 471 combo was being done in the 80's that I know of and maybe 70's. J.Rob

Interesting to look at some balancing information. 471 W/ ICON dished pistons and Eagle 6.535" Rods = 2297.5 Bobweight 360 W/KB Hypers and OEM Magnum Rods(lighter than an LA) = 2074.5 Bobweight 426 W/Mahle and Eagle 6.7 Rods = 1941.5 Bobweight J.Rob

Just going off the top of my head since I'm not in the shop. Cam is 256/260 @ .050" .580"/.585" 111 or 106 I think. Eagle 6.7" H beams Mahle 929962575 I think the bob weight is 1850 or 1950 grams. J.Rob

The bobweight is very low--like small block low. J.Rob

Yes I've heard of it. In fact I have one i'm building for my bodyshop buddy's '72 RoadRunner. I turned a 383 forging to 3.545" stroke x 4.375" bore= 426.33 ci. I'm using a 6.7" Rod with a Mahle piston with a 1.32" CHT. < Correction it is a 1.480" CHT-I've got a lot of builds going on--LOL.I've...