"camel hump" head casting codes
Thread Starter
Melting Slicks
Joined: Apr 2002
Posts: 2,103
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From: Tucson AZ
"camel hump" head casting codes
Running into a little issue here and need some expert help. The NCRS judging manual (and most other resources) have the 1970 LT-1 heads as casting # 3927186. I have also seen :
3991492 350 LT1, 70, 64cc, straight plug, camel hump. These were never listed from 1970-72, so what gives?
3991492 350 LT1, 70, 64cc, straight plug, camel hump. These were never listed from 1970-72, so what gives?
Safety Car
Joined: Dec 1999
Posts: 3,602
Likes: 837
From: PA
Re: "camel hump" head casting codes
The NCRS judging manual (and most other resources) have the 1970 LT-1 heads as casting # 3927186. I have also seen 3991492 350 LT1, 70, 64cc, straight plug, camel hump. These were never listed from 1970-72, so what gives?
I also see 3973414 as a possible casting for 1970 LT-1 applications. While this may be accurate, I can tell you that I have never actually seen one in person (and I've seen more than a few LT-1s).
The 492s are the replacement head for 64cc chamber, straight plug small block heads which require accessory bolt holes. They were never installed on any 1970 LT-1 as original equipment. I believe that this cylinder head casting is still serviced by GM, although it has been a few years since I actually checked.
Hope this helps you out.
Regards,
