Correct Hose Clamps for water pump bypass & heater hoses 68 GT350, 4 spd

[Corey Bowcutt]

I am preparing for the winter projects and one will be replacing the thermostat housing.  Why I am at it I want to make sure I use the correct hose clamps.  What style clamp is used for the small bypass hose between the Tstat housing and the water pump? 

Also why I am at it what are the correct hose clamps for the two heater hoses that attach to the intake manifold and water pump?

One last question, should the upper heater hose going thru the firewall go to the intake manifold or the water pump?

Thank you for your help.

Corey

[Coralsnake]

All are Wittek tower clamps

The intake fitting hose goes to the bottom hole on the firewall.

[Corey Bowcutt]

Thank you Pete!

[68gtcoupe]

I was about to chime in but Pete beat me to it. 

[Bob Gaines]

If you want to be technical the Whittek hose clamp used on the bypass hose is typically the slightly different #2 marked clamp instead of the #10 clamp that comes in kits for the heater hoses. The #2 clamp has a slightly thinner width band and the machine screw is a smaller size although the head is the same 3/8  hex. The #10 clamp is correct for the heater hoses. I think it had to do with what was installed at the Cleveland engine plant (bypass hose) vs. what was installed on the assemblyline (heater hose) at the different plants. It also may have something to do with the close quarters with the bypass hose. 

[Corey Bowcutt]

Thank you Bob!

[Bob Gaines]

Although technically correct it is very hard to tell the difference . The #2 clamps are hard to find so I think given the visual is minimal that it is more prudent to make sure all of the highly visible items are correct first.  Just my opinion others may have a different one.

[shelbymann1970]

Although technically correct it is very hard to tell the difference . The #2 clamps are hard to find so I think given the visual is minimal that it is more prudent to make sure all of the highly visible items are correct first.  Just my opinion others may have a different one.

Learned something new Bob. Thanks. Your knowledge is incredible. Now I need to go look at my Whittek  clamps I just had plated. Gary

[Special Ed]

I have been collecting the skinny #2 clamp for last 30 years since they are hard to find and they are used on boss 429s in lima plant also. I think it was a engine plant thing since the dearborn FEs used the regular heater hose bypass clamps. The bypass hose was different also depending on the engine plant ribbed vs smooth type.

[shelbymann1970]

I have been collecting the skinny #2 clamp for last 30 years since they are hard to find and they are used on boss 429s in lima plant also. I think it was a engine plant thing since the dearborn FEs used the regular heater hose bypass clamps. The bypass hose was different also depending on the engine plant ribbed vs smooth type.

You, too, Ed. You, Bob, and others have been great sharing your knowledge over the years. I have 2 diffent styles of Whittek clamps(2 and 10?). Do all have date codes on them?  Gary

[Bob Gaines]

I have been collecting the skinny #2 clamp for last 30 years since they are hard to find and they are used on boss 429s in lima plant also. I think it was a engine plant thing since the dearborn FEs used the regular heater hose bypass clamps. The bypass hose was different also depending on the engine plant ribbed vs smooth type.

You, too, Ed. You, Bob, and others have been great sharing your knowledge over the years. I have 2 diffent styles of Whittek clamps(2 and 10?). Do all have date codes on them?  Gary

The vintage ones typically yes . Many modern ones no.

[TedS]

I have been collecting the skinny #2 clamp for last 30 years since they are hard to find and they are used on boss 429s in lima plant also. I think it was a engine plant thing since the dearborn FEs used the regular heater hose bypass clamps. The bypass hose was different also depending on the engine plant ribbed vs smooth type.

Did I read somewhere the bypass hose is supposed to be heavier wall thickness than heater hoses?

Ted

[Bob Gaines]

I have been collecting the skinny #2 clamp for last 30 years since they are hard to find and they are used on boss 429s in lima plant also. I think it was a engine plant thing since the dearborn FEs used the regular heater hose bypass clamps. The bypass hose was different also depending on the engine plant ribbed vs smooth type.

Did I read somewhere the bypass hose is supposed to be heavier wall thickness than heater hoses?

Ted

Yes in the context of a bigblock which is commonly substituted with heater hose. Keep in mind that this thread is about a smallblock which has a contoured hose that can not be substituted successfully with heater hose.

[TedS]

You're right Bob, thanks.  My apologies to the thread. Been a long time since I worked on a SB, figured they were similar.