6.1L Hemi in a 1972 Plymouth GTX

Discussion of the 5.7L-6.1L-6.4L HEMIs.

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scottm
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6.1L Hemi in a 1972 Plymouth GTX

Postby scottm » Wed Jun 30, 2010 10:45 pm

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6.1L Hemi in a 1972 Plymouth GTX - Horsepower!
http://www.carcraft.com/featuredvehicle ... index.html

426CI 550HP Hemi
Matt Delaney, Delaney Auto Design, Shreveport, LA
Car Craft held our first Engine Swap Drags event at Firebird Raceway in Phoenix over the last weekend in April this year. It was open to any new engine, modular, LS, or 5.7/6.1 Hemi in a pre-'92 car, and we had a total of zero Hemi swaps show up. Maybe we didn't cast our net wide enough, maybe Phoenix was too far for a potential competitor, or maybe we need to publicize the event better next time around. In any case, we wish Matt Delaney had shown up with his '72 Plymouth GTX. Though the valve coverq say 6.1, this is actually a bored and stroked Mopar Performance 392-inch crate engine. Matt's big-bodied GTX was on display at last year's SEMA show. Judging by the missing fenders, we're guessing this picture was taken before the show.

A. Crossmember
Fortunately, the engine compartment of his big B-Body was accommodating enough to accept the new Hemi with minimal headaches. Using an AlterKtion K-member, he was even able to keep the factory A/C compressor in the stock location. "I live in Louisiana; I have to have air conditioning."

B. Extra stuff
There's a Keisler A41 four-speed automatic transmission behind the Hemi, and the car rolls on a coilover front suspension and a triangulated four-link setup in the back. Matt says his car will post low 12-second e.t.'s and knock down 26 mpg on the highway.

C. Engine
For those of us without the conversion factor hard-wired in the brain, 6.1 liters is roughly 372 ci. Mopar Performance's 392 is about 6.4 liters, but Matt ponied up for even more displacement. He had the block bored 0.020 over and plunked in a 4.05-inch Callies stroker crank. Those changes get you up to almost 423 ci, which is close enough that Mopar guys call this combination a 426. Manley rods and Diamond pistons round out the short-block. Stanton Racing Engines ported the cylinder heads, and Matt says they flow like crazy. The compression ratio is a totally streetable 10.0:1, and Matt kept the cam that came with the engine package. The specs are 229/236 degrees at 0.050 inch, 0.584/0.552-inch lift on a 110-degree LSA. From Mopar, these 392 engines make about 540 hp and 490 lb-ft. With the bigger displacement, Matt says his engine is producing about 550 hp and a whopping 570 lb-ft.

D. Intake
This single-plane intake manifold is from XV Motorsports and was designed to work with either a carburetor or aftermarket electronic fuel-injection kits that utilize a top-mounted throttle body. The advantage to this is the owner can keep the cool Shaker or air grabber hood functional even with EFI on the new-generation engine. This particular throttle body is from Holley. Matt likes it because it uses the same idle air control motor the 392 crate engine comes with. Therefore, he can still use the Mopar Performance ECM that comes with the crate engine rather than switching to a different stand-alone engine management system.

E. Accessories
The brackets and accessories are the same as you'd find on a Charger or Challenger. The power steering pump is from an SRT8 Cherokee because it mounts the reservoir on the pump. "This is all stuff you can buy at a Dodge or Chrysler dealership brand new for about $900," Matt told us. That way, it is easy for his customers to get replacement parts if the need arises.


This is a really cool GTX. :D

392heminut
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Re: 6.1L Hemi in a 1972 Plymouth GTX

Postby 392heminut » Thu Jul 01, 2010 12:13 pm

This is the first I've heard of the Engine Swap Drags. If I had known about it I probably would have taken my Cuda. Firebird is only about 5 hours from me, and my daughter lives about 45 minutes from there! It was definitely not well publicized!
Owner of the Poor Man's Hemi Cuda

mart
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Joined: Tue Mar 22, 2005 2:06 pm

Re: 6.1L Hemi in a 1972 Plymouth GTX

Postby mart » Thu Jul 01, 2010 1:13 pm

392heminut wrote:This is the first I've heard of the Engine Swap Drags. If I had known about it I probably would have taken my Cuda. Firebird is only about 5 hours from me, and my daughter lives about 45 minutes from there! It was definitely not well publicized!

--------------------------
You should probably contact Car Craft directly. Maybe they'd
even do a feature on your car!

mart
======================================================

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scottm
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Re: 6.1L Hemi in a 1972 Plymouth GTX

Postby scottm » Thu Jul 01, 2010 9:33 pm

mart wrote:You should probably contact Car Craft directly. Maybe they'd
even do a feature on your car!


We'd need a TheHEMI.com windshield sticker before the photo shoot :D

mart
Posts: 536
Joined: Tue Mar 22, 2005 2:06 pm

Re: 6.1L Hemi in a 1972 Plymouth GTX

Postby mart » Fri Jul 02, 2010 12:05 am

scottm wrote:
mart wrote:You should probably
contact Car Craft directly. Maybe they'd even do a
feature on your car!


We'd need a TheHEMI.com windshield sticker before
the photo shoot :D

--------------------------------------------------------
Absolutely! I'll get right on it and start working on
one right away!!!! <BIG GRIN>
mart
===========================================

392heminut
Posts: 488
Joined: Sat Nov 30, 2002 2:16 pm

Re: 6.1L Hemi in a 1972 Plymouth GTX

Postby 392heminut » Fri Jul 02, 2010 11:07 am

mart wrote:
392heminut wrote:This is the first I've heard of the Engine Swap Drags. If I had known about it I probably would have taken my Cuda. Firebird is only about 5 hours from me, and my daughter lives about 45 minutes from there! It was definitely not well publicized!

--------------------------
You should probably contact Car Craft directly. Maybe they'd
even do a feature on your car!

mart
======================================================


Not after they saw the paint job. I still want to strangle the guy that did it every time I see him! :x
Owner of the Poor Man's Hemi Cuda


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