prototype ls1 heads 774 casting number
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Teching In
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From: Downers Grove IL
prototype ls1 heads 774 casting number 
I came across a pair of ls1 heads with the casting number 774. I cant seem to find much info on these, I was told they were pre-production/prototypes.Does anyone know anything about these? Any info would be appreciated.
Last edited by JTP6989; Oct 12, 2019 at 01:36 PM.
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From: Central Cal.
Cathedral or rectangular intake ports?
"D" or round exhaust ports?
Aluminum or iron?
Last edited by G Atsma; Oct 12, 2019 at 04:30 PM.
I recall seeing a set like this on ebay a while back. Interesting find nonetheless.
If you CC them or anything we would all be curious as to what you find.
The deck surface has notch in it so likely something they were experimenting with early on. The combustion chamber looks small almost like a 706/862 head
There should be a date cast into them in the rocker arm area. I can just barely make out the outline but not enough to read it.
If you CC them or anything we would all be curious as to what you find.
The deck surface has notch in it so likely something they were experimenting with early on. The combustion chamber looks small almost like a 706/862 head
There should be a date cast into them in the rocker arm area. I can just barely make out the outline but not enough to read it.
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Thread Starter
Teching In
Joined: Sep 2019
Posts: 5
Likes: 0
From: Downers Grove IL
