"HUMP" style header .67 Greenhead

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Ron Zaker Jr

Well-Known Member
Supporting Member
Joined
Nov 26, 2002
Messages
1,592
I have already talked with Stu, CMB does not offer it. What I'm looking for would resemble the Nova .21 header that lets the pipe stay more parallel to the radio lid,but for a CMB .67 Greenhead.. Any ideas or thoughts? Thanks.
 
Ron most of the header tubes are very soft, Ive made wood and aluminum mandrels and bent offsets fairly easy with no heat. A lot depends of course how extreme the offset is.
 
Ron, if you take the 10* header and cut it parallel to face, spin it 180* and have Tom Foley re-weld it should give you what you want.
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I have not seen an issue of pipe performance with this style header in my CMB 21

This header has 2 offsets in its design.

Not only keeps Pipe parallel to tub-but also allowed me to set motor VERY low in tub.

The lower the c/g-the better the boat turns.

In video below I dont turn tight on the buoys but the boat is

capable of doing so.

This old man has had a problem staying off the bouys so I played it conservative in race below.

 
Last edited by a moderator:
Tom didn't mention it, but for the 21 CMB engine using the NovaRossi step header you have to get a different size silicone rubber seal from Stu (older version part) and possibly bore out the header a little to match it. Another option is to find some high temp silicone tubbing at McMaster Carr. I did that, it was cheap and allowed me to use a stock Nova header with the CMB 21 engine. Just mentioning all this, because if you find a Nova header to fit your 67, you may have to deal with the seal mismatch also.

21 seal material:

Seal for 21 CMB to Nova Header.PNG
 
Tom didn't mention it, but for the 21 CMB engine using the NovaRossi step header you have to get a different size silicone rubber seal from Stu (older version part) and possibly bore out the header a little to match it. Another option is to find some high temp silicone tubbing at McMaster Carr. I did that, it was cheap and allowed me to use a stock Nova header with the CMB 21 engine. Just mentioning all this, because if you find a Nova header to fit your 67, you may have to deal with the seal mismatch also.

21 seal material:
Great Find Bob
 
Last edited by a moderator:
Tom didn't mention it, but for the 21 CMB engine using the NovaRossi step header you have to get a different size silicone rubber seal from Stu (older version part) and possibly bore out the header a little to match it. Another option is to find some high temp silicone tubbing at McMaster Carr. I did that, it was cheap and allowed me to use a stock Nova header with the CMB 21 engine. Just mentioning all this, because if you find a Nova header to fit your 67, you may have to deal with the seal mismatch also.

21 seal material:
THX

Great Find Bob
 
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