1970 LT1 Heads
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Instructor
Joined: Mar 2006
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From: South East, USA
1970 LT1 Heads
Hi All - I have heard people say that the LT1 had "202" as opposed to "194" heads - is this true? - if so, what is the difference? - and how can you tell the two apart (casting or stamped number? shape? other distinguishing feature)? - thanks, ed
Melting Slicks
Joined: Oct 2001
Posts: 2,066
Likes: 1,414
From: Halifax, Nova Scotia, Canada
Yes, the LT-1 in 1970 did come with 2.02" intake and 1.6" exhaust valves.
They also had push rod guide plates with screw in rocker studs.
The "194" heads (1.94" intake valves) were the same casting, the final machining of the head determined if it was a "202" or "194" head.
Base engines in 1970 had the "194" heads.
350/350 engines (L46) had the "202" heads as well, however did not have the guide plates and screw in rocker studs.
Barry
They also had push rod guide plates with screw in rocker studs.
The "194" heads (1.94" intake valves) were the same casting, the final machining of the head determined if it was a "202" or "194" head.
Base engines in 1970 had the "194" heads.
350/350 engines (L46) had the "202" heads as well, however did not have the guide plates and screw in rocker studs.
Barry
Le Mans Master
Joined: Mar 2004
Posts: 7,511
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From: Little Rock AR
The other distinguishing feature on LT-1 heads (or any 2.02"/1.60" double hump heads) you will only see with the heads off. The chamber has extra machining around the intake valve to impriove breathing. This is only done at the factory on 2.02" intake valve heads. The 1.94" intake heads do not have any chamber work, they are "as cast" in the chamber area.
-Mark.
-Mark.
Le Mans Master
Joined: Mar 2004
Posts: 7,511
Likes: 1,519
From: Little Rock AR
-Mark.
thx!!
