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-   -   Hemi (http://forums.pelicanparts.com/showthread.php?t=796088)

M.D. Holloway 02-11-2014 07:23 AM

I saw this posted on a site a while ago...

Quote:

If HEMI engines have all these advantages, why aren't all engines using hemispherical heads? It's because there are even better configurations available today.
One thing that a hemispherical head will never have is four valves per cylinder. The valve angles would be so crazy that the head would be nearly impossible to design. Having only two valves per cylinder is not an issue in drag racing or NASCAR because racing engines are limited to two valves per cylinder in these categories. But on the street, four slightly smaller valves let an engine breath easier than two large valves. Modern engines use a pentroof design to accommodate four valves.
Another reason most high-performance engines no longer use a HEMI design is the desire to create a smaller combustion chamber. Small chambers further reduce the heat lost during combustion, and also shorten the distance the flame front must travel during combustion.

yellowperil 02-11-2014 07:27 AM

Check out: Hemihaines in Florida. He's got some stuff, but way outta my $$$range. Great site.

Rednine11 02-11-2014 08:06 AM

Quote:

Originally Posted by M.D. Holloway (Post 7904751)
hemi? hmmm, ok I can see that but looks more pentroof then hemi me tinks...

http://forums.pelicanparts.com/uploa...1392131757.jpg

This is the NEW style small block based hemi
not the 1957-1958 392 or 426 Hemi head design or piston for that matter

Rednine11 02-11-2014 08:11 AM

I can't think of any other engine that can make 10 THOUSAND hp with 8 holes

Rednine11 02-11-2014 08:14 AM

check out
Ray Barton Race Engines
in Pa
He's my first stop for HP

Rednine11 02-11-2014 08:23 AM

Here is the 426 in My 70 Challenger
I dont drive it much anymore

http://forums.pelicanparts.com/uploa...1392135772.jpg

Rednine11 02-11-2014 08:45 AM

I had the honor of meeting Tom Hoover in person a few years back. Great guy
he designed the 426

speeder 02-11-2014 11:54 AM

The sound of a 426 in a street car with headers and mufflers is truly special.

sammyg2 02-11-2014 03:20 PM

Quote:

Originally Posted by Rednine11 (Post 7904889)
Here is the 426 in My 70 Challenger
I dont drive it much anymore

http://forums.pelicanparts.com/uploa...1392135772.jpg

I just drooled all over the keyboard.

mattdavis11 02-11-2014 04:08 PM

I'd like to have this one. I see your SOHC Ford and raise you a DOHC 426 Hemi. I know, never ran on it's own power.

http://forums.pelicanparts.com/uploa...1392163653.jpg

speeder 02-11-2014 04:17 PM

Quote:

Originally Posted by Rednine11 (Post 7904889)
Here is the 426 in My 70 Challenger
I dont drive it much anymore

http://forums.pelicanparts.com/uploa...1392135772.jpg

I'll bet that thing turns the old driveshaft reeeeaaaal good. :)

Rednine11 02-11-2014 04:22 PM

One I had a while back

http://forums.pelicanparts.com/uploa...1392164159.jpg
http://forums.pelicanparts.com/uploa...1392164537.jpg

Rednine11 02-11-2014 04:28 PM

Quote:

Originally Posted by speeder (Post 7905844)
I'll bet that thing turns the old driveshaft reeeeaaaal good. :)

The carburetors were upgraded to two Carter AFB 750's and the cam shaft is a custom grind solid roller, roller lifters and roller rockers. the bottom end is all lightened, balanced and blueprinted plus the heads are tweaked. Arlen Vankey modified the intake for me. In summary yes its a lot of fun with the 4 speed sitting behind it. The
Dana 60 had 4:10's we switched them out for 3:54 to make it easier to drive on the street. these cars are worth so much these days I'm afraid of someone hitting it. so it stays home in the garage most of the time.

mattdavis11 02-11-2014 04:32 PM

Nice, very nice. I once met a guy through friend that had both a 70 Challenger w/ a 340, as well as a 70 Challenger convertible w/ a 440. He was nice enough to give me a ride in both. Both cars had electrically controlled exhaust dumps and some sort of overgear. Not sure what it's called but mated to the 727 was an overdrive where you had 1st, 1st over, so on and so forth. That 340 was a spinning sob, the rumble of the 440, just wow.

What you have Rednine11 is pure awesomeness.

Rednine11 02-11-2014 04:37 PM

Mopar also built a few ball stud Hemis that did away with the dual rocker shafts and used a valve train like a Big block Chevy.
They made it in 400 CUI and 440
They did run them I do know that they blew a 440 on the Dyno. No clue how much HP it made.

Rednine11 02-11-2014 04:40 PM

The OD unit for the Chrysler 727 auto would be a gear vendors unit.
Nice stuff

sammyg2 02-11-2014 04:47 PM

Quote:

Originally Posted by rednine11 (Post 7905854)

kb?

Rednine11 02-11-2014 04:47 PM

here is a piston and rod for a 426
http://forums.pelicanparts.com/uploa...1392165979.jpg

http://forums.pelicanparts.com/uploa...1392166021.jpg

Rednine11 02-11-2014 04:50 PM

Yes Sir
KB Block
Alan Johnson heads, with blower and nitro it made 8000 hp
It was Scott Kalittas motor.
498 Cubic inches

mattdavis11 02-11-2014 04:58 PM

What was the significance of the Keith Black block? I forget. I know they are highly sought after.


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