Repco head.

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Keith Morganstein
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Re: Repco head.

Post by Keith Morganstein » Sat Dec 08, 2018 2:41 pm

Stan Weiss wrote:
Sat Dec 08, 2018 1:20 pm


What is the bore spacing on a 392 hemi and what is the bore spacing for the 6?

Stan
Slant six is 3.98” and 4.0” (not equal on all cyl)
1st gen chrysler hemi inc 392 is 4.5625”
The small early dodge hemi 4.1875”
The 3rd gen 5.7 is 4.46” (which the head was claimed to made from)

Edited to 4.46”
Last edited by Keith Morganstein on Sat Dec 08, 2018 3:03 pm, edited 1 time in total.
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Re: Repco head.

Post by Keith Morganstein » Sat Dec 08, 2018 2:53 pm

5.7 gen 3
BC2600AA-5943-4EAC-92C3-B81C0B6F251E.jpeg
F61A644C-927D-4F1A-BBC8-E9C6BCDA2BDE.jpeg
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Stan Weiss
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Re: Repco head.

Post by Stan Weiss » Sat Dec 08, 2018 2:58 pm

Keith Morganstein wrote:
Sat Dec 08, 2018 2:41 pm
Stan Weiss wrote:
Sat Dec 08, 2018 1:20 pm


What is the bore spacing on a 392 hemi and what is the bore spacing for the 6?

Stan
Slant six is 3.98” and 4.0” (not equal on all cyl)
1st gen chrysler hemi inc 392 is 4.5625”
The small early dodge hemi 4.1875”
The 3rd gen 5.7 is 4.09” (which the head was claimed to made from)
Keith,
I think you need to double check the gen 3 bore spacing. Where I was going by talking about bore spacing is that the early hemi might somehow be made to work. Any other hemi head would need to be sectioned between cylinder to work.

Stan
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Keith Morganstein
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Re: Repco head.

Post by Keith Morganstein » Sat Dec 08, 2018 3:00 pm

Early hemi
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Re: Repco head.

Post by Keith Morganstein » Sat Dec 08, 2018 3:03 pm

Stan Weiss wrote:
Sat Dec 08, 2018 2:58 pm
Keith Morganstein wrote:
Sat Dec 08, 2018 2:41 pm
Stan Weiss wrote:
Sat Dec 08, 2018 1:20 pm


What is the bore spacing on a 392 hemi and what is the bore spacing for the 6?

Stan
Slant six is 3.98” and 4.0” (not equal on all cyl)
1st gen chrysler hemi inc 392 is 4.5625”
The small early dodge hemi 4.1875”
The 3rd gen 5.7 is 4.09” (which the head was claimed to made from)
Keith,
I think you need to double check the gen 3 bore spacing. Where I was going by talking about bore spacing is that the early hemi might somehow be made to work. Any other hemi head would need to be sectioned between cylinder to work.

Stan
It’s 4.46” for the 5.7 Gen 3. I fixed it above
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Re: Repco head.

Post by Keith Morganstein » Sat Dec 08, 2018 3:11 pm

Stan Weiss wrote:
Sat Dec 08, 2018 2:58 pm
Keith Morganstein wrote:
Sat Dec 08, 2018 2:41 pm
Stan Weiss wrote:
Sat Dec 08, 2018 1:20 pm


What is the bore spacing on a 392 hemi and what is the bore spacing for the 6?

Stan
Slant six is 3.98” and 4.0” (not equal on all cyl)
1st gen chrysler hemi inc 392 is 4.5625”
The small early dodge hemi 4.1875”
The 3rd gen 5.7 is 4.09” (which the head was claimed to made from)
Keith,
I think you need to double check the gen 3 bore spacing. Where I was going by talking about bore spacing is that the early hemi might somehow be made to work. Any other hemi head would need to be sectioned between cylinder to work.

Stan
I don’t think there any aluminum heads to cut and weld for the early Dodge red ram hemi, and it’s still too big on bore space.
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Re: Repco head.

Post by grandsport51 » Sat Dec 08, 2018 6:57 pm

This Photoshop or maybe putty and paint fake fascinates me for some reason

Note the intake ports appear round and installed through the intake face of the head .

I remember Bruce Crower doing that on his Chevy Indy project but this savant doesn't have that capability except in cardboard

And spray paint or in Photoshop.. and of course the Valve spring which look to be about 1inch or less in diameter!!

Plus in the 8 pages he previously linked to he stated he had previously made a Chinese Six Hemi Head from a Toyota

3tc which was aluminum Now that looks like a donor candidate to me !!
IMG_2815.PNG

Dave B
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Re: Repco head.

Post by Morgo » Sun Dec 09, 2018 4:34 pm

That is definetly a Toyota 2/3T pushrod Hemi head.While good floving head the lack of compression make them lackluster engines.Great with turbo but to make NA power needs money and someone who knows the engine.
"when uncomptent order unwilling to do unnecsessary the probablity of failure is high"

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Re: Repco head.

Post by pdq67 » Mon Dec 10, 2018 9:26 pm

Didn't Toyota make a copy of the old 241" Dodge hemi?

Would heads off one of them be of any use here?

At least being cast-iron, they could be cut and furnace brazed back together if needed.

pdq67

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Re: Repco head.

Post by grandsport51 » Tue Dec 11, 2018 3:43 am

Keith Morganstein wrote: ↑Sat Dec 08, 2018 2:41 pm
Stan Weiss wrote: ↑Sat Dec 08, 2018 1:20 pm


What is the bore spacing on a 392 hemi and what is the bore spacing for the 6?

Stan
from Keith Morganstein
"Slant six is 3.98” and 4.0” (not equal on all cyl)
1st gen chrysler hemi inc 392 is 4.5625”
The small early dodge hemi 4.1875”
The 3rd gen 5.7 is 4.09”(sic.) (which the head was claimed to made from)"
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Re: Repco head.

Post by hoffman900 » Tue Dec 11, 2018 6:08 am

Morgo wrote:
Sun Dec 09, 2018 4:34 pm
That is definetly a Toyota 2/3T pushrod Hemi head.While good floving head the lack of compression make them lackluster engines.Great with turbo but to make NA power needs money and someone who knows the engine.
A friend of mine was making 185bhp in the late 1970s with them in IMSA trim. AFR was doing cylinder heads for him. I think with today’s developments, those heads could support over 200hp from 1600cc. Worked with Ross on a bunch of dome designs at the time.
-Bob

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