Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars. |
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#1
10-10-2025, 11:33 PM
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Master Cyl
Getting my MC ready for a refresh and I noticed it does not have bleeders. From what I read it should. It’s a Delco,has the right numbers and I believe was original to the car. In looking closely I am trying to determine if the date code is 18 or 184. My car is an April 16 LA build, the 18 might be a bit early and the 184 is too late. Is this a service replacement?
  
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1971 W30 convert, triple green,second owner. 1971 W30 Convert, special order Rally red, completed 68 Camaro Z28,Corvette Bronze,Houndstooth 2016 Porsche Carerra Cab and 2021 C63S AMG ,modern fun. www.vancouverclassiccars.com Last edited by Canuck; 10-10-2025 at 11:36 PM. 
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#2
10-10-2025, 11:46 PM
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What is the Julian date it should have bleeders
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#3
10-11-2025, 12:02 AM
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MC
Quote:
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1971 W30 convert, triple green,second owner. 1971 W30 Convert, special order Rally red, completed 68 Camaro Z28,Corvette Bronze,Houndstooth 2016 Porsche Carerra Cab and 2021 C63S AMG ,modern fun. www.vancouverclassiccars.com
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#4
10-11-2025, 08:10 AM
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The julian date is stamped on the machined surface where the brake lines screw in
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#6
10-11-2025, 01:03 PM
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The original 346, WT master cyl is still on my 1968 Z/28 that I've had for 50 years. It has bleeder screws & no date code.....Joe
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1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO 1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E 1970 'cuda Moulin Rouge, 440-6, 4 speed
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#7
10-11-2025, 01:10 PM
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There is no reason to believe manual/automatic masters were different. Both show code CU in box #56 on the Body Broadcast Copy.
Vintage road test photos (PHR March '69) show automatics with bleeders.
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Learning more and more about less and less...
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| The Following User Says Thank You to William For This Useful Post: | ||
Keith Seymore (10-11-2025) | ||
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#8
10-11-2025, 05:11 PM
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From JM’s 67/68 Z28 book confirming 5460346 WT master with bleeders.
Other things I’ve noted regarding the 346 master are that there are 2 front styles for the WT stamp and that some masters have an upside down cast number. I believe that both versions of the WT stamp are legitimate although beware that reproductions (or restamps) do exist as stated in Chick’s build thread. I also believe that both versions of the casting number are legitimate. I do wonder if Defiance had more than 1 foundry and if that’s the reason for the different casting number orientation and stamp font? If you’re also looking for a lid you’ll need one without a SAE stamp. There are reproduction lids out there but it’s easy to spot them since font and word spacing is different.
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#9
10-11-2025, 05:20 PM
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Nice looking master here. Perhaps still available.
https://www.yenko.net/forum/showthre...hlight=5460346
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