L89 Aluminum head date code location
Thread Starter
Heel & Toe
Joined: Jan 2011
Posts: 18
Likes: 4
L89 Aluminum head date code location
Hi
Does anyone know where the date code is located on Al head 3919842. Can it be seen with head on engine I'm trying to verify a #s matching L89 vette
Thanks MLC48
Does anyone know where the date code is located on Al head 3919842. Can it be seen with head on engine I'm trying to verify a #s matching L89 vette
Thanks MLC48
Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
Hi
That is what I thought too.
The cast heads have it under the valve cover, but the alus have it unvisible as long as the intake is installed.
Hence unvisible for NCRS judging.
Rgds. Günther
That is what I thought too.
The cast heads have it under the valve cover, but the alus have it unvisible as long as the intake is installed.
Hence unvisible for NCRS judging.
Rgds. Günther
Safety Car
Joined: Nov 2008
Posts: 3,729
Likes: 559
From: Seattle Washington
It might be possible to see it with a Bore a Scope. They are used in the Large Diesel Engine world do look into Cylinders with out removing the Heads. One might be able to remove an Intack Bolt and go down threw its Hole, if not for sure down the Distributor Hole. As said above, the NCRS can't see it so it must be right.
Melting Slicks
Joined: Apr 2005
Posts: 2,777
Likes: 105
I have the same heads on my BB and the date code is stamped to the left of the third intake valve spring (on pass side) - third intake runner. (Second intake runner if on driver side) Dates are stamped vertically. They are identical out of the box.
Simply remove the valve covers. The date codes are both stamped in this area. The part number is right above them slightly to the right and displayed horizontally.
The original L89 heads are not this number. The ones you have are Chevrolet Factory replacements #3919842 - aluminum closed chamber rectangular port heads.
Simply remove the valve covers. The date codes are both stamped in this area. The part number is right above them slightly to the right and displayed horizontally.
The original L89 heads are not this number. The ones you have are Chevrolet Factory replacements #3919842 - aluminum closed chamber rectangular port heads.
Last edited by babbah; Feb 6, 2011 at 11:30 PM.
