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#1
08-20-2005, 09:42 PM
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Re: ZL-1 & L-88 head design clarification
The L88 head was also made in steel as a parts replacement item.
If you went to the parts counter at a Chevy dealer and ordered an L88 long block, it would come with the steel heads. I have a CE stamped 512 block, and on the inside of the head is stamped L88. The casting # for these heads is not listed in all of the Chevy parts books, like Colvin's.
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 COPO 9561/9737 M40 X11D80 13.37 @ 105.50 on pump gas,drove it to NATL TRAILS and back [email protected] SCR22 
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#2
08-20-2005, 10:04 PM
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Re: ZL-1 & L-88 head design clarification
[ QUOTE ]
The L88 head was also made in steel as a parts replacement item. If you went to the parts counter at a Chevy dealer and ordered an L88 long block, it would come with the steel heads. I have a CE stamped 512 block, and on the inside of the head is stamped L88. The casting # for these heads is not listed in all of the Chevy parts books, like Colvin's. [/ QUOTE ] Andy, What was the casting number for the steel L-88 heads? I've never heard this before. Love to know more. Also, what made them different from any other rectangular port big block head of that same production period? Steve
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#3
08-21-2005, 12:12 AM
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Re: ZL-1 & L-88 head design clarification
The L-89 in '70 was only for the 396. The L-S7 that never made production would have had the open chamber aluminum heads. (Which over the counter could have steel heads also.) The L-S7 was to replace the L-88.
P.S. The L-89 in 70 was closed chamber.
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#4
08-21-2005, 03:02 AM
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Re: ZL-1 & L-88 head design clarification
Steve, I wish I had taken photos of the casting numbers when the covers were off. The "HI PERF" is there, and the dates are March and April of '69.
They also have the "half moon" casting mark, indicating a closed chamber, square port application. Difference between them is the amount of grin on your face at WOT. 
__________________
COPO 9561/9737 M40 X11D80 13.37 @ 105.50 on pump gas,drove it to NATL TRAILS and back [email protected] SCR22
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#5
08-21-2005, 03:04 AM
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Re: ZL-1 & L-88 head design clarification
Here is the casting mark.
__________________
COPO 9561/9737 M40 X11D80 13.37 @ 105.50 on pump gas,drove it to NATL TRAILS and back [email protected] SCR22
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#6
08-21-2005, 03:46 AM
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Re: ZL-1 & L-88 head design clarification
They are not just 840 heads? I would think they would be since 842 and 840 are vitually the same save the material.
Jason
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#8
08-21-2005, 06:50 AM
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Re: ZL-1 & L-88 head design clarification
I see we are talking about 69 version heads. They are 990s.
Jason
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#9
08-21-2005, 08:27 AM
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Re: ZL-1 & L-88 head design clarification
[ QUOTE ]
Here is the casting mark. [/ QUOTE ] Andy, Where exactly is the "half moon" casting mark on the head? Front/rear face? STeve
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