I have had a few people ask about the 3.79" stroke stuff and just wanted to see if there was any other interest in these combos.

Rod

Yes.

I'v been interested in the 3.79 stroke for a long time. Been told the 3.79 stroke always makes more power than the 4.00 stroker motors when the other components are kept the same. Any truth to this. My 408 will need freshening in a few years and interested in this 3.79 crank again.

I personally like the 3.79" stroker combos. Just seems to work well. Kind of on the edge though for bracket guys that have good heads, they just don't want to turn them that many RPM.

Yes!!! It's about the bigest I can use in my 9" deck..

If you can make one with 2.25" mains and 2" rod journals for my Furd main R3 Rod!

callies used to have a dragonslayer in the 3.79 stroke and i believe it had 360 mains. so,whats the verdict on 3.79 stroke,do they make more power than 4.00 stroke? rod ratio would be better and maybe less friction or side loading with the shorter stroker. anyone dyno'ed the two to see any differences?

I like the 3.79 stroke on blocks that can go over 4.100 bore, on factory blocks go with more stroke

The 3.79" stroke and a 6.25" rod is a fantastic High RPM combo...when you have enough head to take full advantage of it.

For ~90% of Street/Strip or Moderate (sub 7000 RPM) Bracket cars they don't usually have enough head CFM to take advantage of the RPM; So in a lot of ways you're better off with a 4" stroke "Torque Motor", especially with an Automatic. but with good heads 4 speed or a light car I'd prefer a 3.79 all the way

I can not believe all the people who think a shorter stroke will make more power I guarantee that if NASCAR let every one run a 4.185 bore and 4 inch stroke there is not one team that would keep running 3.125 or so strokes. Or if pro stock told every one they could add 1/2 inch stroke to whatever they are running that every team would run the bigger stroke. Or Indy car or sprint car or Formula 1 or...

If you are block limited like the guy with a 9 inch deck height then maybe but a factory 9.6 deck height small block can easily swallow a 4 inch stroke with little if any grinding and even a 4.25 with a little minor grinding. Then you can make a lot more power at lower RPM so your valve train can last longer and the average between TQ peak and HP peak will tend to be a lot fatter and result in a faster car.

Pro stock does not limit stroke. They limit the cubes at 500. Thats why they run the little stroke and huge bore. More power that way.

I just never understood the 3.79 stroke. 3.800" is much more common in higher end engines. If you have a low deck block 3.800 is about the limit for stroke.

If I had a tall block I would rather have 4.00" but nothing wrong with the shorter stroke if you don't have room.

Leon

NASCAR don't limit stroke either, just saying if they had the option to run longer stroke as a way to go beyond the current cube limit then they ALL would do it. Unless there is a cube limit then there is no reason to run less stroke than the maximum your block can easily handle (I am not talking compromising cam profiles or ring lands or grinding too close to water passages, just within reason)and a standard deck height SB mopar can easily handle more that a 3.79 stroke.

Having to work within a CI displacement limit has nothing to do with the choices they make in any of those series...

I bet they wouldn't mind turbochargers either.

Yeah 440 inches in a cup car would only mean about 235-250+ at places like michigan. Probably in the 1000+ hp.

I talked to bill richardson at ram racing a while back about both cranks and which one he would choose in a small block. He liked the 3.79 over the 4.00 saying while dynoing both the 3.79 always made more power on the dyno. These were street/strip motors. Just curious if anyone here had simular info to draw a conclusion.

Will the 3.79 make more power per cubic inch? yes, more total power no. A 3 inch stroke would also make more power per inch than a 3.79 but less overall HP and less forgiving of anything less than perfect shift timing and even harder on valve train... that has all been my experience.

When bill told the 3.79 always made more power than the 4.00 on the dyno he didnt explain how. I figured their might be better rod ratio and less side loading and less friction with the 3.79 crank and maybe thats where more power can be made over the 4.00 motor.

@BPE I think that generally a 3.75" works better because that way with a 6.25" rod you can use the same stocking stroker piston as a common 4" stroke with a 6.123 rod in a typical 9.6 deck

long stroke and long rods only work on the internet