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Author Topic: 1968 BB Bypass Hose Clamps  (Read 632 times)
cook_dw
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« on: August 20, 2013, 12:55:06 PM »

I noticed the other day as I was going over some photos that there were 2 different style heads on the screw portion of the bypass hose clamp.  Was the socket head due to the fact it was soo close to the pulley that a screw driver was not able to be used versus the smooth rounded flat head screw on the intake side of the hose?




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Darrell Cook

1967 LeMans Blue SS/RS L35 clone
1968 Rallye Green SS L78 - unrestored original
1968 Matador Red Z28
JohnZ
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« Reply #1 on: August 21, 2013, 10:22:49 AM »

Don't know about '68, but we (NCRS) judge '67 Corvette big-block bypass hose clamps as shown in the bottom photo above as correct; side-screw clamp with a filllister-head slotted screw.
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Ed Bertrand
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« Reply #2 on: August 21, 2013, 10:47:14 AM »

John, the 68-69 Corvette judging manual states that the bypass hose for the 427 used a Wittek number 10, single screw clamp, type D (see drawing below). Comparing the two pictures to the drawing, I would say the top picture is right, but that screw sure looks awful long!

Of course, there was probably an overlap period in early 1968 when either could have been used.

Ed

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cook_dw
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« Reply #3 on: August 21, 2013, 11:22:46 AM »

Also I had read in another thread about the spring clamps versus tower clamps when the switch was introduced.  This car had both originally.  My father pulled the spring clamps off due to them leaking over time & using the old worm style clamps.  Spring clamps were on the heater core side & tower as you can see on the engine side.
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Darrell Cook

1967 LeMans Blue SS/RS L35 clone
1968 Rallye Green SS L78 - unrestored original
1968 Matador Red Z28
JohnZ
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« Reply #4 on: August 22, 2013, 09:32:19 AM »

John, the 68-69 Corvette judging manual states that the bypass hose for the 427 used a Wittek number 10, single screw clamp, type D (see drawing below). Comparing the two pictures to the drawing, I would say the top picture is right, but that screw sure looks awful long!


Ed -

They apparently changed the clamps for 1968; the 1967 bypass hose clamps used Fillister head screws, which were tall and round (not hex) with a straight slot. The one in the top picture with the LONG screw is a replacement of some sort.
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