Destroked 426 Hemi

Post by **scottm** » Mon Jun 06, 2005 5:53 pm

Someone asked me for info (engine specs) on a destroke
426 Hemi that was available. This was news to me, so I
decided to do some research to see what I could dig up.

So far...

I'm told that 396 and 400 ci versions of the 426 Hemi were
run in Pro Stock from 1972 and up. The 396 with a 3.48"
stroke and 400 with a 3.50" stroke.

Does anyone else have any more information? Post it up
and shoot me a PM or email with the details so I can share.

Thanks!

Post by **scottm** » Tue Jun 07, 2005 9:51 pm

The original request mentioned maybe a 366 ci Hemi.
Sounds like the 366 ci motor might have come from a
383 destroked and topped with Hemi heads. Not sure
how many people actually ran these small Hemis, but
they sure do sound interesting!

Bailiesdad · Post by **Bailiesdad** » Wed Jun 08, 2005 5:34 pm

scottm wrote:The original request mentioned maybe a 366 ci Hemi.
Sounds like the 366 ci motor might have come from a
383 destroked and topped with Hemi heads. Not sure
how many people actually ran these small Hemis, but
they sure do sound interesting!

it was a 426 block not a 383 block.

firepower354 · Post by **firepower354** » Sat Jun 11, 2005 4:06 pm

Pro Stock drag racing was a pounds of vehicle per engine cubic inch class in it's early days. The 426 heads on the much lighter low deck block was a way to get more hp/ci. The 3-3/8" stroke really let them rip on the top end.

Qwik426 · Post by **Qwik426** » Fri Nov 18, 2005 2:52 am

"I'm told that 396 and 400 ci versions of the 426 Hemi were run in Pro Stock from 1972 and up."

They were used earlier than that. Ronnie Sox ran a destroked 404 cu. in. HEMI in his 1970 'Cuda Pro Stocker for a while in 1970. But generally speaking, the destroked 426 HEMI's were more common in the 1972-on up years as they made better HP/cu.in. than a standard size HEMI. Also, it enabled their cars to run approximately 210 lbs. lighter which translated to quicker acceleration out of the hole--a must when unfairly burdened with 7.25 lbs./cu.in. weight break versus the favored small block Vegas' 6.5 lbs./cu.in. and Pinto's 6.75 lbs.(?)/cu. in. breaks, etc.

Regards,

Q426

Qwik426 · Post by **Qwik426** » Fri Nov 18, 2005 2:55 am

"The 396 with a 3.48" stroke and 400 with a 3.50" stroke."

To the best of my knowledge both of these engines ran the same 3.48 crank. The difference in cubic inches was because of a slightly larger cylinder bore on the 400 - 405 cu. in. HEMI engines.

Regards,

Q426