The 1965 NCRS TIM (pp 131)states that 1965 PB master cylinders use 3/16" outlet lines without adapters and 1966 uses 1/4" outlet lines. Nolan Adams' resroration guide Vol 2 (pp 272) shows 1965 using adapters, and 1966 connecting directly. Also Richard Newtons 63/67 restoration guide (pp172) states the same. The corvette 53-72 parts book (4.650) shows for 1965 a 1st design MS with 3/8x24" threads, and a 65/66 second design with 7/16x24 threads. I see no notes in my AIM indicating when 1st design stopped and 2nd design started. My 65's born on date was 12/29/64. The casting # is 5467084, and came equipped with adapters. I am sort of confused....HELP
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Re: C2 1965 1966 Master Cylinder PB J50
With all due respect, Noland Adams book was incorrect when it was issued new on this particulatr item and has unfortunately never been updated. The '65 model year all used the small outlets and the change was made to the larger size with the start of the '66 Model. The adapters are strictly a workaround to allow the use on the '66 master cyl on a '65 car, as the '66 was the only unit serviced in the latter part of the '70's.Bill Clupper #618 -
Re: C2 1965 1966 Master Cylinder PB J50
Eric,
I have to agree with the info in the adams book on this one. I believe the original style/part number cyl without adatper fittings, part number 5467005, started out the 65 run and used the small 3/16" lines without adapter fittings.
Some time during the latter part of the 65 run, the 005 cyl was replaced in production with the 66 style cyl, part number 5467321, originally designed for the new 66 model year that used the new larger 1/4" steel frame mounted brake lines without adapter fittings.
In order to use the new 321 cyl with the existing 3/16" steel brake lines of the 65 model, adapter fittings were installed in the cylinder that allowed the 3/16" line to be used.
No other components of the 65 brake system were changed.
For the introduction of the 66 model with the new larger 1/4" brake lines, the same 321 cyl was used but without any adapter fittings.
I don't know the point in production when this change in cyl occured but it's possible there may be some info in the 65 AIM that shows the addition of the two new fittings. However, if the new 321 was delivered to the line with the adapter fittings already installed, there would have been no need to make any changes in the AIM as the new part would be installed exactly the same as the 1st design. I suspect this was the case but I don't have a 65 AIM here to verify.
There has been a few lengthy discussions on this issue in the past. Check the archives and try 5467005 or 5467321 for search key words.
MichaelComment
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Re: C2 1965 1966 Master Cylinder PB J50
The part number for the "first design" master cylinder is 5467005, with no reference of a change until Part number 5467321 was introduced with the '66 AIM. Although I have owned a couple of "last week of production" cars, and would not rule out anything in that timeframe, The AIM certainly indicates this was a model-year change. In addition, no documented late-production '65 has been verified with this configuration. Although not impossible, it is neither common, nor verified as an original '65 configuration.Bill Clupper #618Comment
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Re: C2 1965 1966 Master Cylinder PB J50
Bill,
In a 1966 printing of the parts book, it lists the different cyl's as follows;
65 Corvette w/P.B.(1st design)................5467005
65-66 Corvette w/P.B. (2nd design) ...........5467321
So, at least the parts source was aware of the mid 65 run change, even if it wasn't listed in the AIM. As I mentioned, a 321 cylinder, with proper adapter fittings installed, could have been substituted for the 005 on the line with no additional instructions necessary.
I don't remember the exact VIN of the well known 3000 mile 65 maroon 396 car but that car had the adapter fittings and 321 cyl. I believe it was in the 19,000 VIN range. Not sure on the 1500 mile 65 FI car that came out of a barn in 1978 but I'll look at the pic's.Comment
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Re: C2 1965 1966 Master Cylinder PB J50
Eric, I have an early 65 (11/18/64) with power brakes and the casting number is also 5467084.
Regards,
Floyd
65 fuelieComment
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