Who’s 383 stroker kit is the most bang for the buck???

I used 440sources 438 kit before with good results, but now noticed That Mancinis 432 kit has a 4.15” crank vs the 440 sources 3.75” crank. We are pushing a 1969 RR with a 4 speed and 3.55 gears, who’s kit is going to make the most power for this heavy car?? Either way, we plan on using the stealth heads, headers, good ignition system, a voodoo .475-.495 lift Cam matched in rpm to a dual plane intake manifold good for about 1400-5800 rpm range. Thank you moparts!!!!

4.15 stroke may make for some really short pistons. might have oil control issues and want to rock in the bores some. 4.15 should provide more torque than the 3.75, if you like the 3.75 stroke kit before use it again. not a really high revver of a high power engine stopping at 5800 rpm. so the shorter stroke with less problems would get my vote.

does the 4.15 crank use shorter rods?

No, both kits use a 6.76 rod

then I think you will have a short piston with the 4.15 crank.

what about muscle motors stroker kit for the 383?
i think it uses a 3.9 stroked crank with a shorter rod and yields 450 cid.

Those 4.15 cranks use Mopar rod journals which need the block to be clearanced while the 2.2" BBC journals on the 4.25 crank usually just drop in.

As has been posted the 4.15 crank needs the short 1.112 CH piston with the long rod.

4.25" gives you 489-496 cubes using the 6.535 rod and the 1.320" CH piston.

No replacement for displacement and it's the same price.

Kevin

Thanks Kevin

I have a 69 383 block here that i'm looking to do something with so i'll keep my eyes post here.

I would go with the 440 Source 4.250 kit. Mo cubic, mo better. It uses the 2.2 pins that you want and you don't have to deck the block.

What about the rod ratio with that kit?

I would go with the 3.9 stroke and 6.535 long rods. A really good combo.

David Reher said don't worry about rod ratio.

440 Source with light weight crank....493 cubes

My own:
440 crank offsetground to 3,9"
BBC rods + .250"
Flat top 454 pistons in any size. ? .060 -> 455 c.i.
You need to make valve reliefs in the pistons.
The crank prep is about the same as a 451/470 B stroker combo.

No superlight high $$$ parts here, just pieces to make cheap CI, as is the intention of using a 383 block.

The big en d width comes with a lot of side plat with the chevy rods....Is it ok to race an engine with so much side play ?

Bob Glidden, Smokey Y, The Grump, GM/Ford/Chrysler engineering all seem to think rod ratio is a fairly important factor.....and more than just a connection for the piston to the crank.

Of course it is To many keyboard racers focus on the wrong things on race motors
I've raced NHRA Stock, S/ST,S/G , I've built my own blue printed motors and helped several other former NHRA World champions on there Mopar cars engine builds, rod side clearances can be close or loose and the motor will still perform the same on the dyno or at the track
I've seen ONE stock Mopar V8 motor that had near the minimum Mopar FSM recommended rod side clearances, it was a early production 1966 street Hemi motor that had less than .016 on all the rods, I've also seen as much as .042 side clearances on 318 motors
My first pump gas 400 block stroker build with BB Chevy rods had from .052 to .039 side clearances, it ran fine, didn't use oil and revved like a SB did I shifted it between 7000 and 7800 RPM with no issues ever

4.25 stroke with a 6.535 rod is still a slightly better rod ratio than a stock 454 BBC.

Kevin

Cab....
I just took my 440 crank to the shop and the side play would be a total of .065 to .070...is this getting way too much ??
Thanks

No, absolutely not
A lot of the none Hi Po race machined shops preach what there machine shop instructors taught them in their schooling, if they had any formal training
Your golden as far as I'm concerend
BTW, what parts, rods and crankshaft, did you end up with?

ok if you say .065'' is still ok I will have the machine shop do the work.....

I will use 6.700 chevy rods 1968 440 crank.....440 source +14cc pistons for 12.5cr....

Thanks

i looked at the same deal, haven't talked to a machine shop yet but i have a 440 crank that's already been machined for a lowdeck. it's gonna need a little clean up on the journals (very light surface rust spots) so was thinking to 2.20 rod pin and 3.90 stroke.

but, i'm not sure for a mostly street motor, idling in traffic and the sorts, that i would feel comfortable with that rod side clearance...

Scares me too.....but if Cab says so..........I guess it will center itself while running

I don't understand why everyone gets so hung up on side clearance. Too little is a concern. I doubt within reason there is such a thing as too much.

I think the oil coming out of the outside of the 2 rods under pressure hits the radius of the journal and tries to push the rods together while the oil on the inside tries to push them apart effectively holding them in a stable position. Assuming everything that is supposed to be round is round and not tapered, there really isn't much reason for them to move at all much less bang into each other.

Kevin

Did you have your crankshaft grinder offset grind the crank to increase the stroke or just reduce the rod journal size only?
The reason I'm asking is if it is offset ground most shops end up with a standard radius on the inside of the offset centering the rods towards the middle of the rod journal
Mopar has used a reverse radius as long as I know of on the rod journals that does not have a step up or a corner for the rod bearing journals to ride up against like all the other OEM makers use

Yes I was about to have it offset grind, just found out the old crank is finally just junk !!.....next crank please !

Ohio Crankshaft CO (800-333-7113) 4.25 stroke
Them or Tom Molnar at 616-940-4640
If your stuck with a 3.91 stroke then I would call 440 Source to see if they have one in stock or not

For a street car, lower RPM engine, the 4.25" stroker kit with the shorter rod ratio is fine. It will produce alot of low end torque. On a 496" street engine you don't need to mess with the high compression pistons. The 20cc dished pistons should be good for around 10:1 compression with an 80cc head.
I have used the 440 source kits, and they are decent, but have everything inspected and checked if you don't have the tools to do it yourself.
Same with the source heads. Really any of the aftermarket heads need to be disasembled and cleaned as a minimum. I was surprised at how dirty the aftermarket heads are, and that is pretty much true for any of the brands.

The cam you mentioned is really too small for a 496" engine.
The 10230704LK would be OK in the engine 234/242 @ 0.050", 0.513"/0.533" lift. The Voodoo cams use a 3-bolt timing gear, so make sure to order the correct timing chain set for the cam you use.