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Author Topic: Let's call it a 426 small block.  (Read 3082 times)
heyoldguy
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« on: February 01, 2015, 04:13:34 PM »

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
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500Jon
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« Reply #1 on: February 02, 2015, 09:41:02 AM »

Hey Old Guy.

That's a stunning result with a 360 motor!
Looks like 440's are history now!!!
Loving those Torque numbers too... 2thumbs
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IF A JOB's WORTH DOING, ITS WORTH DOING WELL, RIP DAD.
4-SPEED, 1969 Charger-500 is the most Coolio car in the World!
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« Reply #2 on: May 04, 2015, 10:02:15 PM »

Does this motor have any street manners, or is it a race type build?
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1972 Charger Topper Special, 360ci, 46RH OD trans, 8 3/4 sure grip with 3.91 gear, 14.93@92 mph.
1973 Charger Rallye, 4 speed, muscle rat. Whatever engine right now?

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heyoldguy
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« Reply #3 on: May 10, 2015, 07:43:46 PM »

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.
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c00nhunterjoe
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« Reply #4 on: May 10, 2015, 08:27:26 PM »

So close to 600 horses. Any tuning left to squeeze the ponies out?
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heyoldguy
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« Reply #5 on: May 11, 2015, 01:00:04 PM »

With what I've discovered it should pull over 600 pretty easy next time on the dyno.
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ACUDANUT
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« Reply #6 on: May 11, 2015, 02:43:50 PM »

That's a very impressible build.  cheers
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heyoldguy
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« Reply #7 on: April 30, 2017, 08:33:27 AM »

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.
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Challenger340
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« Reply #8 on: May 02, 2017, 02:02:55 PM »

This is a very well done Engine  2thumbs and even better numbers, WOW !
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BSB67
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« Reply #9 on: May 13, 2017, 12:17:55 PM »

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?
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500" NA, Eddy head, pump gas, exhaust manifold with 2 1/2 exhaust with tailpipes
4150 lbs with driver, 3.23 gear, stock converter
11.68 @ 120.2 mph
heyoldguy
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« Reply #10 on: May 17, 2017, 04:51:07 PM »

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.
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69wannabe
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« Reply #11 on: June 29, 2017, 07:35:41 PM »

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....  2thumbs
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