HEMI Tech - Cooling Systems

Just an FYI, the block pictured above is not actually a Chrysler casting. That is one of the New blocks Gene Adams was involved in developing. The large support ribs in the valley are the dead give away.

 

If that is a new casting ya gotta wonder why Gene included the casting marks around the valley.... Seems like a frivolous detail that could be used as a deception.
As for the coolant holes, what has Gene found in his research that would lead him to that particular pattern as opposed to duplicating MaMopar?
I looked at a dozen blocks and, as gimpy says, all appear the same with the holes at the rear. The exception is the 51-53.
With all of this head-scratching I'm just about bald....

 

Yes I corrected that though on your prompt, ( thank you) but in another post. We both know what I said the first time didn’t accurately state what I meant to say.

 

I just grabbed the first gen-1 picture that came up.

Searching for "392 Hemi block" gives you a deluge of pictures of the new ones.

 

Hello folks.
Old thread I know but I'm looking for your valued advise on rebuilding a 1955 331 Hemi water pump for a friend down here in Australia.
The pump arrived fully disassembled, all cleaned up and with a new rebuild kit like in the photo below.

I've confirmed that the impeller and fan hub have the desired press fit onto the shaft, the bearing fit into the housing is good and the the carbon seal contact face in the housing is very acceptable.
My MAIN concern is where the impeller should be positioned inside the pump housing ..... depth/clearances wise.
I read online that the impeller to housing clearance should be ~0.010" but it didn't mention where the clearance should be set at ...... impeller vane tips to housing or rear cover to impeller?
If I place the loose impeller into the housing and the impeller vane tips sit on the mating/machined conical housing face there is ~1/8" of space left between the impeller rear face and the rear cover plate.
Also, the clip that snaps onto the bearing OD through a slot in the housing snout has a large degree positional freedom.
Consequently I'm a not sure where to position the impeller inside the housing cavity.
Thanks in advance ..... I'll gratefully appreciate any experienced technical advise.

 

prob split the difference would be close!

 

Gary at Quality Engineered Components, "73RR" here on the Board, should be able to answer your question. If he doesn't weigh in, send him a PM.

 

Hey guys, I was digging into this thread yesterday, trying to better understand cooling on these old Hemis.

I have a 1956 354 Hemi I am rebuilding. I am running the hot heads 4 barrel intake and their cross over and chevy water pump. The engine is going in a lowered 56 New Yorker with the goal of driving it a lot.

Question; do I need to run hoses from the cross over to the back of the heads or can I run the head block off plates and rely on the coolant to run thru the intake?

Here is the motor in the car before I pulled it out to take to the engine builder. You can see the hoses running to the back of the heads from the cross over


This photo shows the back of the engine where you can see the hoses connecting to the back of the heads


Can I ditch the hoses and run these block off plates?

 

isn't there some benefit getting cooling water back there directly?-maybe just prettier or even 'stealth' plumbing..?

 

The back of the heads are normally blocked off from the factory, so yes! block them off!. Those hoses are supposed to go to the heater core. I'd just loop it. The long BB Chevy W/P will fit over the stock timing cover, the OEM 392 crossover bolts right on and you'll have less of a problem with radiator hose/fan interference.

 

so no benefit to try to cool the back end off 'extra'?

 

Might screw up the intended direction of flow. Might be a case of having a temp gun and getting readings of various locations on the block & heads with & without the hoses & seeing if there's any differences. Having them blocked helps with firewall clearance also.

 

My brother set this all up 20 some odd years ago. The more I’ve been looking at this, the more these two hoses doesn’t seem to belong. If you look on the crossover just under the thermostat housing, he added a spacer that has these hoses connecting from there to the back of th heads.

I want to put the block off plates on the back of the heads when this motor goes back together. Just wanted to make sure I was seeing this correctly.

 

Are the coolant ports on the front and back of the heads so you do not end up with a driver side and passenger side only head?

 

Yup!

 

ah!!