Topic: Whittek Heater Hose/Water Pump Clamp Question

[Craners]

Application is 428CJ, June motor build, Later July car assembly.
The clamps I sourced from Marti are stamped 1 1/16?
The clamps used on block/water pump appear smaller OD and I believe are stamped 1 inch.
Is what I found on my car correct?
Attached are a few photos of the block by-pass hose assy.  Fairly certain that this is original. 
Any assistance is appreciated.
Thank you
Fran

[Bob Gaines]

Application is 428CJ, June motor build, Later July car assembly.
The clamps I sourced from Marti are stamped 1 1/16?
The clamps used on block/water pump appear smaller OD and I believe are stamped 1 inch.
Is what I found on my car correct?
Attached are a few photos of the block by-pass hose assy.  Fairly certain that this is original. 
Any assistance is appreciated.
Thank you
Fran

Sometimes the clamps on the bypass hose are different then the ones on the heater hose. The bypass hose is installed at the engine plant and the heater hose clamps are installed at the assemblyline plant. In this big block case once installed and painted the 1/16 OD difference is virtually indistinguishable. The same thing happens on earlier year smallblock but in that case the bypass hose clamp has a narrower band and the threaded screw is smaller diameter. Even in that case it is very hard to tell once installed.

[Bob Gaines]

I would also mention in the case of the big block the factory special bypass hose although reinforced is a thinner wall then heater hose .The special reinforced thinner wall hose does not ballon out as much when the clamp is tightened down compared to heater hose made bypass. Ether hose will work but sometimes (not always) a heater hose made bypass can be distinguished as such by informed enthusiasts.  The bypass hose bulging is way noticeable then a 1/16 OD difference in a clamp diameter. 

[Craners]

Thank you.
Based on your comment, 1 inch is possible factory install.
I checked my heater core hose clamps for this car. 
Those clamps are 1 1/16?.
I did compare the by-pass hose to the heater core hoses. 
The ID & OD are the same. Appears to have the same reinforced hose type as well.

See attached photos

[Bob Gaines]

Does your bypass hose have a red stripe too?

[Craners]

I removed the clamps to see if the by-pass hose has the red stripe. 
No red stripe.
It does have a second white stamping mark.
That looks similar the Fomoco with rectangular surround. 

 It does have rib striping in the rubber, but not the same rib striping as the red stripe heater hose. 
See attached photos.

[Bob Gaines]

I removed the clamps to see if the by-pass hose has the red stripe. 
No red stripe.
It does have a second white stamping mark.
That looks similar the Fomoco with rectangular surround. 

 It does have rib striping in the rubber, but not the same rib striping as the red stripe heater hose. 
See attached photos.

Although the bypass I have seen are more typically a thinner wall the fact that the hose does not have matching red stripe and is solid black like all of the original and NOS FE bypass that I have seen (not that I have seen them all) suggests to me that it has most likely not been replaced with a commonly fabricated heater hose by pass like most.

[specialed]

Craners your bypass hose and clamps are original from factory and has white fomoco marking as i have 2 takeoff sets here. My  dearborn fe is no grooves but my  lima 429 s have grooves.  2 vendors  and bypas hose c2oz  has thicker walls so as not to swell up under extreme heat and pressure so its a different hose than heater hose. I have some nos in fomoco  paper bags that have the white fomoco stamp and 2 different lenghts  sold under 2 part #S . There should be a gap between water pump and hose and block and hose as most restorers fit the bypass hose tight and thats not concours correct.