3.90 stroke crank for a 440

[m79ded]

Hi

Does anyone out there make a 3.90 stroke crank for a 440?

I was looking around and didn't find anything.

I would also consider offset ground crank I hear that they are OK

Usage will be street use with mild bracket racing

Thanks

 

[RustyRatRod]

Here's one purdy close.

http://store.440source.com/3915-Stroke-Crankshafts/products/40/

 

[m79ded]

I saw that one it's for a B not RB

 

[Meep-Meep]

You can offset grind the stock crank to a 2.2" journal and get really close if not right on. Then get aftermarket rods to fit. Also, if you go really light on the rods and pistons it may be best to take a cut on the crank counterweights so you don't end up with Swiss cheese. Just a guess, but removing .080" - .100" off the radius might be enough.

 

[Garys1969RR]

440 Source has a 4.15" stroke for an RB 440 stroker motor. Comes to 500 plus cubes. Far as a 3.9" stroke? Dont know of any other than a custom grind as Meep Meep suggested.

 

[Cranky]

Had one...makes for around 470 cubes in a .060 over 440. It was offset ground.

 

[m79ded]

Big thanks to MOPARMATT72 he found out that Ohio Crankshaft has 3.90 crank.

 

[Budnicks]

The 3.95" offset ground 440 crank, with BBC rod big ends, is an old reliable stroker combo from years ago, 440source still has a 3.95" stroker crank-shaft I think, it's been a while, since on the site... 0.030" over 4.350" bore 440 w/3.95" was 469ci, 0.060" over 4.380" w/3.95" was 476ci both were decent low RPM combos.... had a 3.95" in a 383 0.040" over 4.290" bore 456ci ran great too... all years ago now.... Crank mains need to be turned to Low-deck B-Specs & Counterweight radius reduced to 7.250" max, {I went to 7.125" lighter mass & easier balance job} for use in the 383-400...

 

[Moparmatt72]

Was just glad to help

 

[383man]

I use the 440Source 4.15 crank in my .030 over 440 block. It actually comes out to 493 cubes and works nice. Even with stock size rod journals I only had to clearance where the oil pump pick-up goes into the block. Ron

 

[m79ded]

Great idea I wanted to go that route again. Tried it a few years ago with manifolds and a thermoquad carb 484 cam ross flattops with 9.5 comp and the thing would simply just not stop pinging. Tried different carbs,distributors, timing, plugs, but unfortunately didn't help.
The manifolds even turned red,valve cover even got discolored from the heat.
The instant I put headers everything was OK.
After talking with a very helpful person (Dwayne Porter) in vermont the explanation that makes sense is that there is simply too much heat in the cylinder/chamber.The manifolds are just holding too much heat for it to work in a street car on pump gas.

So I was going to take a chance with a bit less cubes with a 470 ci range and see if it works.
Another build that I witnessed was a source 4.25 stroke with manifolds but this time aluminum heads it helped but timing had to come down to 30 and it didn't run well it was like a tractor engine 450hp and 570tq

 

[Garys1969RR]

Hello, m79ed, I am using stock HP manifolds on my 69RR, stock exhaust all the way to the oval tail pipe ends. And at 12.5 to 1 C/R in my 451, it doesn't ping or overheat the maniflods. But I run 100 Sunoco. When I un hooked the mufflers at the track, went from 14.23 1/4 mile to a best of 13.76. @ 103MPH. Were you running a 496 when you had the pinging probs? Maybe the thermo quad was the problem. Oh and I removed the entire heat riser valve (except for the shaft) from the pass side ex manifold. Just still wondering why your motor pinged so bad with stock ex manifolds. Ok C Ya

 

[m79ded]

Hi Garys1969RR, It was a 496 that I had. I ported the 68 b body manifolds and removed the heat riser.I tried a holley 850dp on it as well.When I did try it out with headers it ran hard went 11.85 turning motor @5400.
Later put back the 440 completely stock looking with thermoquad, no pinging ran really nice went 12.70's with radial tires, had lots of fun with it.Tried with the Holley went 12.90's One of the big differences with the 440 motor that I should mention is it has those KB 184 Hyperpathetic quench pistons.