Search results for query: *

No I used a 400 block for a total of 426 CI. Theres a thread here about the Youtube guy that had the same idea. J.Rob

I've only gone as far as 3.545" and the jury is still out on that--LOL. J.Rob

I'd take a 360 over a 383 any day. I've never seen 500+ft/lbs out of a stock stroke NA 383 ever, but I have seen it with a 360 more than a few times. J.Rob

In 2011 for EMC I built a 371 (.060" 360) that made 513 ft/lbs 1.38 tq/ci 532hp on pump gas with teeny tiny EQ iron Magnums that at the time only flowed 267-272 cfm . IMO I made them a bit too big in the bowls. Weiand X-celerator manifold/750 XP. That engine was surprising for what it was. When...

If you have reversion you have overlap. If you don't have overlap you dont make much power. Overlap equals RPM. IE. You always have reversion. J.Rob

I guess so but I actually have metrics and quantifiable data to go by. What I can't do is determine a persons toleration/expectation of how that engine "drives". Your example of a 750 gaining 15hp will absolutely give up driveability. My threshold for moving to a bigger carb may even be based on...

This B.S. about wanting 0 vac comes from the Nascar world and only applies to them. If I saw actual 0 vac on a carb the engine would not be able to run as there is no fuel flow either. In fact I believe and know that better atomization occurs in more vacuum. Its not just velocity created by a...

I never said it was wrong, I'm saying its like chasing a big flow number---If you put 300cfm capable heads on a 450hp engine--that engine will not drive as well as an engine with 225 cfm heads on it making 450hp. The pumping loss most are so focused on is because its low-hanging fruit--easy to...

This will suck to drive on the street in comparison to the 4150. J.Rob

You and GTX John have got it right. J.Rob

This is the reality right here ^^^^^. J.Rob

Sort of but not really --LOL. This is a major hint right here>>> The best running street engines will produce about -1.5" hg @ WOT AND move close to the same amount of CFM as the carb is rated for. As has already been stated if you are looking for the least restrictive carb and pull -.5" hg...

At the risk of this thread becoming even more convoluted-Its not really the correction factors, everyone uses the old STP/SAEJ607 and not the newer SAEJ1349 which is how the OEM's rate their products. Dyno's are all over the place more than likely because of other factors like cell construction...

I slam 'em both, I don't discriminate. J.Rob

And??? Did you miss the 383? J.Rob

I built a 383 back in 2002-2003 that the customer wanted an exact reproduction of the 335 HP/383 his R.R. came with. It made exactly 335hp/375-380tq. No surprises. J.Rob

Then sit back and learn something. J.Rob

Makes sense right? J.Rob. P.s. So glad I have a dyno.

Must be something in the air tonight but I really question a 3.38" stroke 400/406BBM @ 1.33 ft/lb/ci>>>Thats quite remarkable considering the sub-5000RPM tq peak. That's excellent cylinder filling. J.Rob

Its funny, currently out of town on a pipeline gig and Watching Just Mopar Joe talk about a 400 vs 440 dyno test hes done. J.Rob

No I'm sorry, didnt realize I quoted you. Sorry. J.Rob

The comments are really erratic, "Cut the pistons, Get new pistons, Bore it to 440 size, Get aluminum heads, Deck the block, Align hone the block, " etc...... One guy even said to build a stroker out of it...<<That is really the only thing that makes sense. So already Nick is talking about...

So...? The new valves caused no valve clearance? I find that weird. The pistons don't seem to be anywhere near zero deck and the cam doesn't seem to be anywhere near .500" . Not there to measure it so....Must be. This is a great opportunity and I'm glad Nick is taking this approach with even...

J.Rob

A tight wrist pin/pin bore can do this. I agree. J.Rob

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...

Going to a bigger valve will help but its not really the right way because if those heads are like what I have seen the throat is chopped completely straight down. A 2.100" may even be the best "fix" but then the rest of the port probably won't play well with a larger valve. A smaller seat ring...