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Re: edelbrock nhra head [Re: CMcAllister] #3063699
07/29/22 05:52 PM
07/29/22 05:52 PM
Joined: Jan 2003
Posts: 14,071
So. Burlington, Vt.
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fast68plymouth Offline
I Live Here
fast68plymouth  Offline
I Live Here
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Joined: Jan 2003
Posts: 14,071
So. Burlington, Vt.
In a different thread on classracer Larry Hill mentioned.......”they’re a lot of work”.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: edelbrock nhra head [Re: B1duster] #3063714
07/29/22 07:39 PM
07/29/22 07:39 PM
Joined: Nov 2011
Posts: 255
PA
Harry's Taxi 2 Offline
enthusiast
Harry's Taxi 2  Offline
enthusiast

Joined: Nov 2011
Posts: 255
PA
"Valve Sizes Int./Exh.: 2.25 / 2.00"

Would these sizes be correct for this Edelbrock unicorn head?


'86 Maple Grove KOS Mopar low qualifier......true street legal with no power adders.

NOS-used when losing since 1940.

Re: edelbrock nhra head [Re: Harry's Taxi 2] #3063715
07/29/22 07:41 PM
07/29/22 07:41 PM
Joined: Jan 2003
Posts: 14,071
So. Burlington, Vt.
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fast68plymouth Offline
I Live Here
fast68plymouth  Offline
I Live Here
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Joined: Jan 2003
Posts: 14,071
So. Burlington, Vt.
The head comes bare.

Those are the sizes of the seat inserts.

It isn’t really a “unicorn” head.

It’s the same casting as a regular RPM head.
It has unfinished valve seats and the cnc’d port openings are omitted.
They are straight plug, and it gets the NHRA logo machined into the ends.

It’s up to the end user to make sure it meets all the pertinent criteria to make it suitable for use in the class it’ll be run in..... stock or SS.

If they were a simple “bolt on and go” deal in stock.......... everyone would be running them.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: edelbrock nhra head [Re: fast68plymouth] #3063734
07/29/22 09:30 PM
07/29/22 09:30 PM
Joined: Jan 2004
Posts: 6,697
fredericksburg,va
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cudaman1969 Offline
master
cudaman1969  Offline
master
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Joined: Jan 2004
Posts: 6,697
fredericksburg,va
Some assembly required.. From the guys I talked to who run stockers it is more beneficial to replace the 64-66 915 head than the later 906 head since the 906 is vastly improved over the early head (they have a secret way to fix the aluminum head). Also there’s so many later heads-cars out there that NHRA has a better handle on their HP than the early low performance engines. The racers are always looking for the killer combo but eventually NHRA catches up.
What there really looking for is a iron 452 BRAND NEW casting identical to the original to just do a valve job and run them.

Last edited by cudaman1969; 07/29/22 09:34 PM.
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