CRG Discussion Forum

Camaro Research Group Discussion => Decoding/Numbers => Topic started by: LeadFoot_69_Z/28 on October 04, 2006, 12:02:25 AM

Title: 1969 Z/28 Holley 4053 DZ questions
Post by: LeadFoot_69_Z/28 on October 04, 2006, 12:02:25 AM
I have a 1969 Z/28 with a build date of April, 3rd week, 1969.

I have a 4053 dated 924 (8 weeks previous) and 941 (2 weeks previous).

Is the 941 the perfect date for an April, 3rd week, 1969 Z/28?  I have read that 3 - 6 weeks is the best.  Is 2 weeks previous (941) too early?

Please look at these 4519 and 5583 metering blocks (below). See how the castings are different in each picture?

(http://i84.photobucket.com/albums/k5/LeadFoot_Z28/924_blocks_2_txt.jpg)

(http://i84.photobucket.com/albums/k5/LeadFoot_Z28/941_blocks_2_txt.jpg)

Which one is correct?  Why are they different if they both are stamped 4519 and 5583?
Title: Re: 1969 Z/28 Holley 4053 DZ questions
Post by: hotrod68 on October 04, 2006, 03:26:30 AM
I'd guess that's just a Holley casting mark anomaly, Lead. Holley made a blue million metering blocks! I'd think the important thing woiuld be the DZ on the choke horn. Can they actually trace the metering blocks to a specific carburetor?
Title: Re: 1969 Z/28 Holley 4053 DZ questions
Post by: KurtS on October 04, 2006, 06:11:32 AM
Go with the closer one. Remember that was the build date of the body, car was completed several days later.
Title: Re: 1969 Z/28 Holley 4053 DZ questions
Post by: JohnZ on October 04, 2006, 03:59:12 PM
The "circles" are ejector pin pads, where slides pushed on the casting to eject it from the die-cast mold; they have no functional effect at all.
Title: Re: 1969 Z/28 Holley 4053 DZ questions
Post by: jdv69z on October 04, 2006, 04:24:53 PM
My 10B, Oct '68, build date Z has a caburetor mfg date of 872; a lot closer to 8 weeks than 2.

Jimmy V

Title: Re: 1969 Z/28 Holley 4053 DZ questions
Post by: firstgenaddict on October 04, 2006, 06:24:53 PM
I would think that the early cars would have carbs spaced out futrther than the later cars just because of ramping up production.