Looking for advice for 383 stroker build and gearing - e body, auto trans. The car is strictly a street car, so I’m thinking 600hp range is plenty. I see kits out there to make it a 496 screamer - the biggest requirement is has to run on 91 octane without issues. So how would you build it - engine, stall and gears

Thank you

First off I would start with a 400 block if possible. The extra bore diameter makes things easier. I'd also limit the engine to a 4.250 stroke and use a 2.200 pin size with a Chevy rod. Probably 6.70 long but that can vary depending on things. Compression ratio should 10.0 or less to run on 91. Maybe even put it in the low to mid 9's. Use Trick Flow 240 heads and a modest hyd roller cam and you'll be good to go. Might make 600 hp if everything is done just right but I wouldn't bet on it. Should be in the 550 range without any trouble though.

I agree with using a 400 block instead of 383. No reason to give up bore sizing and the packaging size is the same.

With my RB 505, I'm at 10.3:1 and can run the cheapest pump swill out there but typically run 91 No Ethanol.

Deep gearing and high stall aren't required when you have a stroker because of the massive torque at low rpm they produce (assuming cam choice is correct).

We run a (rated) 2800 stall 11" converter and 3.54 gears and the car still 60 ft.'s really hard!

If you already have a 383 block and can’t easily get a 400 block, use the 383.
I have a 383 .030 with a 440source stroker kit. Makes 489 cubes. Mine has flat top pistons
and will be 11-1 with Ported Edelbrock heads. Comp XR292R solid roller and a tunnel ram with dual carbs.
I bought the unassembled short block off Greg’s list, 4.25 stroke 6.535 rod, 440source kit. I thought about getting
a 400 block and getting new pistons but decided to use what I have. If your starting from scratch, then start with a 400.
Your most likely going to want to use a dished piston.
http://store.440source.com/Stroker-Kits/products/3/ Good luck.

With that question, when Andy answers first..... the thread is done.

If this is a street car rebuild it to stock!

I wonder which Gregg they are talking about?
OP, don't spend your time and money using this combination, buy a longer stroke crank to make more power, either have a used 440 crank if you have one, and have it ground down on the mains and counter weights to fit your low deck block and have the rods offset ground down to BB Chevy rod journal to increase the stroke to 3.900 or 3.910, what ever the crank grinder can get you
If you don't have or can't buy one, forged steel 440 crank, really cheap, buy a new 4.250 stroke crank and buy the parts you need to make the kit you want for your motor.
The first low deck pump gas stroker motor I built back in the early 2000 was a 400 block that needed four sleeves to make it useable, I bought a Ohio Crankshaft Company 4.250 stroke low deck crank and a set of China made CAT brand BB Chevy type forged H beam rod that had the BB Chevy wrist pin and rod bearing size that was 6.700 long, I had Ross Pistons make me a set of dished pistons that gave me 9.25 to 1 compression ration with the pistons down .025 from the deck and using a .017 thick beaded steel head gasket with a set of big valve mildly ported 906 heads that had 84.0 to 84.5 CC chambers. These parts made 9.25 to 1 compression ratio for CA pump swill back then. I ended up using a custom ground Comp Cams solid roller cam that was 260 degrees @.050 on the intake with .420 lobe lift and it had 266 @.050 on the exhaust lobes with .409 lobe lift ground on a 108 LSA installed at 107 ILC.
I used a low deck dual plane Eddy six pack intake with a set of 1970 440 automatic carbs modded by C and J Engr. in Whittier, CA for street and strip use.
That motor made 592 HP at 5000 RPM on the first pull
I ended up testing three different sets of carbs on that motor that day, the best set made 612 HP at 5500 RPM with 644 Ft. Lbs. torque at 4500 RPM, the worst set, new 1971 440 automatic carbs, made 5 HP less with 7 ft. lbs. less torque
That motor exceeded my wildest hopes and made me open my mind on how to build pump gas Mopar BB stroker for street and strip cars
Good luck on your deal
Big is best, C.I., cam, heads, carb and intake size, good stall converter, biggest tires you can fit and light is right on rotating parts like the rods, pistons, valves, rocker arms, wheels and tires and crankshaft and car and driver weight

4.25 stroke 489 cube, dish piston, 240 TrickFlow heads and https://www.lunatipower.com/voodoo-retro-fit-hydraulic-roller-cam-chrysler-361-440-294-302.html. Should get pretty close to 600

Keep in mind I don’t do this for a living, but I did stay at a Holiday Inn Express last night

https://www.hotrod.com/articles/new-life-for-mopar-383-big-block/

They’re calling it a 496, but it’s a 489

https://m.youtube.com/watch?v=PW_gb9_0t5w 650hp on pump gas

Changing the jets 8 size without testing other sizes in between is flat Stupid
Been there and did that more than once to find out later that two size bigger made a lot more power and torque than 8 sizes bigger did

I didn't see any mention of the jetting or AFR on that build in that article
I have dyno tested a bunch of motors with jet changes and did a lot of at the track testing to get the best ET and MPH, none of the motors or cars like real rich mixtures below 12.5 AFR, usually 13.2 to 13.6 AFR was the best jetting for that car or engine that day with the weather
I've seen .4 ET and 4.0+ MPH gain going from 11.8 AFR to 13.3 at the track on the same day on a pump gas street car
That owner loved it

I'm surprised there still aren't any off the shelf high compression pistons for 383 combos.

The 400 strokers with 2.2 rods rev like small blocks. My old 458" was great - 400 with 4.375 bore and like 3.89 stroke.

400 blocks are getting more scarce though but if starting from scratch use a 400 block.

ICON has shelf pistons for 3,375, 3.75/4.25 and 4.15 stroke combos, they are the manufacturer for the 440 source pistons. If you want more compression than a flat top gives you, you need to be talking to Diamond for custom/semi-custom stuff. S/F....Ken M

If you want a screamer leave it a 383. Put a 440 rod in it, lots of shelf pistons available , good set of heads, but good rocker gear and camshaft and wind it up. I turn mine 8000+ every shift, every weekend and it sounds great.
Just a thought.


Hutch