ZL-1 & L-88 head design clarification

**ANDY M** · #1 08-21-2005, 03:02 AM

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.

**ANDY M** · #2 08-21-2005, 03:04 AM

Here is the casting mark.

**SuperNovaSS** · #3 08-21-2005, 03:46 AM

They are not just 840 heads? I would think they would be since 842 and 840 are vitually the same save the material.

Jason

**COPO** · #4 08-21-2005, 05:51 AM

I think the open chamber iron heads are #990.

**Born30YrsLate** · #5 08-21-2005, 06:36 AM

These '69 cast iron L-88 heads...I picturing them to be very similar to the ZLX head - open chamber cast iron...

**SuperNovaSS** · #6 08-21-2005, 06:50 AM

I see we are talking about 69 version heads. They are 990s.

Jason

nuch_ss396 · #7 08-21-2005, 08:27 AM

[ 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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