Let's call it a 426 small block.

[heyoldguy]

It's not really a 426 but it sounds better than 423.5, 4.042" bore and 4.125" stroke in a 360. BPE rotating assembly, 10.9:1, 91 octane, our ported ProComp cylinder heads, Super Victor intake, RS Race Demon 1050 cfm 4150 carburetor, TTI headers, our spec'd Comp solid roller w/165 psi cylinder pressure @ 5000' elevation.

RPM...................TQ/HP

3000................450/257
3200................466/284
3400................480/311
3600................490/336
3800................496/359
4000................499/380
4200................518/414
4400................532/446
4600................546/478
4800................554/507
5000................557/530
5200................543/538
5400................535/550
5600................528/563
5800................519/573
6000................510/582
6100................504/585
6200................497/587
6300................497/596
6400................486/592
6500................477/590
6600................466/586
6700................457/583

[500Jon]

Hey Old Guy.

That's a stunning result with a 360 motor!
Looks like 440's are history now!!!
Loving those Torque numbers too...

[Paul G]

Does this motor have any street manners, or is it a race type build?

[heyoldguy]

It idles @ 800 rpm, was designed for a street driven 1967 Dart with 3.55 gears and an automatic transmission. There has been a delay preparing the car for the engine and for some additional work required to the motor to correct it's lack of performance.

[c00nhunterjoe]

So close to 600 horses. Any tuning left to squeeze the ponies out?

[heyoldguy]

With what I've discovered it should pull over 600 pretty easy next time on the dyno.

[ACUDANUT]

That's a very impressible build. 

[heyoldguy]

So the owner sent it back to freshen it up.

Just a couple of changes.

(1) We replaced the aluminum heads with our ported LAX iron heads using a Chevy stud mounted rocker arm system with a girdle mounted to the cylinder heads.

(2) Changed the 1050 Demon for a 950 cfm Trick Flow.

It now makes 481 lb-ft a@ 3,000 rpm, the start of the dyno pull. 572 lb-ft peak @ 4,800 rpm and 603 HP @ 6,300 rpm. And it is still making 594 HP @ 6,600 rpm where we shut it off.

[Challenger340]

This is a very well done Engine  and even better numbers, WOW !

[BSB67]

It idles @ 800 rpm, was designed for a street driven 1967 Dart with 3.55 gears and an automatic transmission. There has been a delay preparing the car for the engine and for some additional work required to the motor to correct it's lack of performance.

What converter is panned?

[heyoldguy]

It is using a TCI 142200, 10" 3,000-3,500 stall. It actually was running 3.23 gears and we just installed a 3.91.

And, it is coming off the dyno, after some other corrections, with the two best pulls today of 618 & 620 horsepower.

[69wannabe]

Great numbers for a small block for sure!!! That's going to be a wild ride in a Dart, and I thought my big block was fast....