383 Stroker build

[gforsberg]

Hey everybody, I'm hoping for some people much more experienced than myself to evaluate this build! This is what a local engine builder has come up with for me. I have asked for a 500 to 600hp 383 stroker build. Probably not relevant as to the build itself but it's going in a 67 Dart with a Torqueflite, 3.55 gears and 28in tires. Torque converter will be built/bought to match the engine and transmission build.
Will be expected to run on 92 pump gas

Forged Piston
6.760 Flat Top 4.5cc
IC513KTD.040
eagle forged 4.150 stroke crank
eagle H-beam 6.760 rods
trick flow 240 head 78cc chamber
proform aluminum rocker kit
Arp head and main bolts
comp 21-228-4 flat tappet cam
comp lifters
powerbond balancer
race bearings
hv oil pump
Carburetor, Street Q, 4-Barrel, 850
CFM, Square Bore, No Choke,
Mechanical Secondary, Dual Inlet,
Aluminum, Tumble Polished, Each
QFTSQ-850
Performer rpm intake
EDE 7186

Please, let the opinions fly!

 

[Cranky]

You can do HP with a short stroke engine but they like rpm. If your car is on the heavy side, it's going to like torque. Short stroke engines can produce torque but it's usually at higher rpm's. It would be helpful to have more info on the build of the car in general....

 

[gforsberg]

Thanks, 67 Dart GT two-door hardtop, being built to handle decently, 73-76 K-frame, 1.14 torsion bars, SPC Gen 1 adjustable upper control arms, reinforced lower control arms with poly bushings, PST 1-1/8 anti-sway bar, adjustable strut rods, borgeson power steering , four wheel manual disc brakes from Dr Diff, 275/35/18 front tires, 315/40/18 Rears, Mini tubbed. Narrowed 9-1/4 rear with custom 8-3/4 style axles and housing ends, so no c-clips. 3.55 sure grip. Will be a built up A518, non-lockup O/D automatic trans.

 

[496 polara]

Should make boat loads of torque and plenty of HP. I question the pro-form rockers on an otherwise good quality build. I think the comp 21-225-4 or the solid lifter equivalent may be easier to control the valve train.

 

[Lefty71]

Sounds like its going to be fun.... if it were mine, i do something similar, but most likely start out with a big bore 400, and maybe not go so long with the stroke....3.75" will still scream on the street or track either one (451).

 

[273]

You can do HP with a short stroke engine but they like rpm. If your car is on the heavy side, it's going to like torque. Short stroke engines can produce torque but it's usually at higher rpm's. It would be helpful to have more info on the build of the car in general....

Guess you didn't read the stroker part (383/478, 4.15")

 

[fishmens67]

You can do HP with a short stroke engine but they like rpm.

Me loves a high revving 383.
The next best choice is a 400 based 451. They rev like a sewing machine.

 

[Cranky]

Guess you didn't read the stroker part (383/478, 4.15")

It was just my opinion....after all, the OP did say 'let the opinions fly', right?

 

[273]

It was just my opinion....after all, the OP did say 'let the opinions fly', right?

Yes you have the right to your opinion, but it really didn't have anything to do with the OP's build since he's building a stroker aka long stroke engine. It just seemed like you didn't see that bit of info

 

[fishmens67]

Yes you have the right to your opinion,

So what's your opinion, considering OOTB heads what stroke would you recommend, me 451.
I believe the 451 is the best for a 260-300cfm head.

 

[Cranky]

Yes you have the right to your opinion, but it really didn't have anything to do with the OP's build since he's building a stroker aka long stroke engine. It just seemed like you didn't see that bit of info

I read his post....3 times now and it sounds to me like he's looking for opinions. Do you know if he's even started the build yet?? If you have a bone to pick with me, let's take it off the public forum.

 

[273]

So what's your opinion, considering OOTB heads what stroke would you recommend, me 451.

My opinion he's probably better off listening to his builder than randoms on the internet, but I would think about switching to 400 block instead, bigger bore, 20 more Cid or run a 3.915" for same ish cid 470 but the 383 will still perform well enough if that's the choice for whatever reason.

I believe the 451 is the best for a 260-300cfm head.

To me depends on your rpm goals, where do you want hp to peak where do you want it to shift ?

 

[ch1ll]

Lose the eagles rotating assembly and go with scat at a minimum or a higher priced unit like molnar.

 

[ch1ll]

Consider running a thermoquad carburetor. That alone might be more Costly at the onset, but will have benefits down the road.

 

[gforsberg]

So far it's been a little over 2 years of disassemble, blast, metal work, rust repair, panel replacement while at the same time working on drivetrain components. I had a good 69 original bore 383 block so that's the reason for that. It's been boiled and magnafluxed and is at the builders shop. I don't consider this forum rando's per se, yeah you'll get a variance of opinions for sure and a little weeding out is required but there's a lot of expertise in here I find and the Builder is not a Mopar specific guy he does a lot more LS stuff, of course, so that's why I figured it was worth asking here. Sorry, I'm more of a browser not a big poster and I was having issues trying to add people's quotes so I just tried to answer the questions all in one.Thermoquad? Really?

 

[273]

Sorry, I'm more of a browser not a big poster and I was having issues trying to add people's quotes so

If just answering one persons post, just hit reply on bottom right and it will automatically add the quote for you to reply too. if you want to reply to a bunch of statement, high light each and it will give an add quote option, then go to the reply box and click on Insert Quotes.

 

[fishmens67]

My opinion he's probably better off listening to his builder than randoms on the internet, but I would think about switching to 400 block instead, bigger bore, 20 more Cid or run a 3.915" for same ish cid 470 but the 383 will still perform well enough if that's the choice for whatever reason.

To me depends on your rpm goals, where do you want hp to peak where do you want it to shift ?

What a bunch of mumbo jumbo. lol

 

[273]

What a bunch of mumbo jumbo. lol

No math, no graphs, or articles though

 

[forphorty]

If I was building a stroker with TF heads , it wouldn't have a hyd flat tappet. And the tires need to be sticky.

 

[fishmens67]

it wouldn't have a hyd flat tappet

and surely not for a 500-600 hp build.

 

[fishmens67]

depends on your rpm goals,

Wouldn't have to rev the 451 much higher than a 470, the 451 will get there much quicker too. like a sewing machine

 

[273]

Wouldn't have to rev the 451 much higher than a 470, the 451 will get there much quicker too. like a sewing machine

Never said much higher (probably 200-400 rpms depending on efficiency's) all I said was run the displacement that puts the hp at the rpms you want it at.

 

[mopowers]

Cam seems on the small side for a stroked big block.

 

[Dart Frog]

You say flat top pistons what's your compression ratio going to be seems like an awful lot of stroke for a standard combustion chamber.

 

[gforsberg]

Planning to be 10.5 to 11