Best stroker kit for a 383/440?

Seems this belongs here.

I have been out of the game a fast ten years building a ranch in Idaho. Sold my cars and Cuda vert to pay for my out of pocket home build too. I have a 63 Sport fury vert I’m considering building and debating a modern Hemi VS a 383 or 440 stroker.

My last few kits were 440source but I recall hearing their quality dropped?

Plus after 10 years I’m sure there are new suppliers ect ???

Try Ohio Crankshaft company for you parts, they make good stuff here in America
I make my own kits using their crank and rods and either Ross or United Machine Icon forged pistons, AKA as KB, pistons /If your wanting to build a motor with some power and want to rev it up regularly look for a 400 block instead of the 383 or 440 blocks, they both have real thin main webbing that will crack under medium to heavy duty use, the 400 blocks live a lot longer

As Cab says, the 400 block is your winner. I have a 512 & a 455 stroker 400, both are as good as each other although I rev the the 455 higher. If you go past 470 cubes you'll want to consider max wedge ports if you want to make real power, but a 500+ cube std port would make a zippy street car, just the top end will be lacking, but how often are you going to be maxed out on your rpm? I don't use Source parts, im a believer that you don't skimp on the spinning bits, if they fail, the costs are astronomical & it would have been cheaper to have bought real quality in the first place.

I had a 470 built for my Charger. Used a Molnar crank with Eagle rods and Ross pistons. I also agree that the 400 is the best block to start with. As far as new hemi engines go, they are great but I feel it takes away some of the cars soul so to speak.

Our favorite is the 440 or 400 based 512 kit....These things make power

And there is absolutely no reason NOT to use the available Chevy 2.20 rod journal. My next build will be a 512/400 block combo, from Molnar.

Like any engine combo it all depends on your goals for it. A 451-499 with a 6.760 rod is a stout street-strip engine with a STD port head. My opinion on the 496-512 is the shorter rod requires a max wedge or B1 size intake port. Also 1.6-1.7 rockers and an aggressive intake lobe. Without getting into to much the piston in these combos moves away from TDC FAST and it needs plenty of flow volume available when it does. STD port heads and a larger than needed cam grind can crutch this but the engine will not reach is power potential without enough port AND intake volume. Some calculations on Larry Meax's software is eye opening.

For a street car I'd go with the 4.25 inch stroke crankshaft regardless of the block. The 400 is probably the best block to use followed by the 440 and then the 383. Any will work, but the 400 gives you a very nice combination of power and size. The 440 block might make it a little easier to find headers and intakes and stuff like that so if you have a good 440 block I'd use it.

500 inches with the 4.25 crank and a set of good aluminum heads will give you plenty of street power, even with a smallish street friendly cam. We build these engines all the time and depending on which heads and cam you pick you can see up to 600 ft-lbs of torque and between 500 to 600 hp.

I would highly recommend Molnar crank and rods. Mahle pistons are also really nice. We've had ours since 2016 and they have been awesome! 4.25 stroke, 2.20 rods and 7.1" long rods (440 RB).

I like to think I torture test stuff more thoroughly than most people what with all the hard street miles and drag strip passes we make with a big, heavy car and lots of spray.

I wouldn't say 440 Source's quality has gone down.

I agree with this ^^^^^^^^^

I'm surprised nobody has offered two cents regarding doing a G3. I built a very mild 400 based 512 stroked motor back in 2018 and have been very pleased with it. I would probably give a 6.4 G3 a lot more thought now. Cast parts and O-ring gaskets. Everything just seems to seal up so much better than the old stuff.

Pretty much all we build when it comes to strokers......My goal though is to switch to a G3 with some kind of pressure adder in my one car.

Here is a low deck 512 that we ran at the end of last year. Pump gas compression, mild cam, Trick Flow 240 heads. Made 600 ft-lbs of torque and 550 hp. Very simple build, most of the parts come from Summit. No trick machine work, just do the basics and double check everything. Goes right together without any issues.

What were the cam specs on that one?

Who sells the best stroker kit with highest quality needed parts, crank, rods, pistons, rings, bearings, such as Molnar crank and rods, Mahle pistons?

Best to just buy individual parts and piece it all together?

I think it was 236/244 but I'm not 100% sure anymore. It wasn't the "perfect" cam for the engine, but cores were hard to find so the customer bought a cam that he found on the shelf. It worked pretty good for what it was.

Depends on what you're trying to do. If you are going to build a serious race engine then I'd buy the best parts you can and piece them together. For a street engine one of the kits is the best deal providing that you can find one that gives you the correct compression ratio with the heads you are going to run.

B
I wouldn't say they were up there with the top quality stuff either. You get what you pay for & I wouldn't go cheap on the spinning stuff.

Thanks Andy F for the info. What suppliers do you recommend checking out for a 4.25 inch stroke kit for 440 for a fun fast street car? What brand crank, rods, pistons, rings, bearings do you use?

If anything, over the 23 years we've been making and selling stroker kits, the quality has only gone up. Our pistons are made for us by United Engine and machine, a local company that's been making pistons since 1927. All our rods are made for us by SCAT. All bolts are genuine ARP. Bearings are Clevite, Rings are Total Seal, all USA made stuff. We've sold tens of thousands of kits all over the world, builds in Hot Rod Magazine and others routinely make 1000-1400 horsepower with no problems.

[i][/i] thx. It’s definitely going to be a street car .

I would think Andy's basic 512 combination along with a mildly ported Indy Dual plane 440-D would be a perfect combination for what you are looking for.