Factory pipe manifold???

Mike W

Mike W

Infidel
Location
North Florida
The diameter of the top of my manifold is 42mm and the diameter of the headpipe is 47mm. I can only assume what I have is a 650 manifold which probably explains why my ski didn't run like it should.
Anyway, in order to bring it up to 701 specs I know I will have to get it bored. Will the exhaust ports need any porting or is the 650 ports the same as the 701?
 
S

sflsurfrider

ive seen the b pipe manifolds not match the headpipes.... even in brand new sets. post a pic of the manifold where it bolts to the cylinder. they are visually different.
 
Mike W

Mike W

Infidel
Location
North Florida
The 701 exhaust gasket does match the manifold ports.
 

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Matt_E

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
A true 650 FPP manifold will have smaller exhaust ports. They can be opened up though.
 
Matt_E

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
No, not really. I've done one (matched to a 760 no less) and the casting itself doesn't appear to be any different.
Plenty wall strength left.
 
S

sflsurfrider

seriously? ive never done it... ive only compared with gaskets. maybe theres plenty of metal left, but where the 2 mating surfaces come together, its a thin line. is it not?
 
Speedfreak

Speedfreak

Location
So. IL
No problem. Since I done that manifold I have found flap wheel disk as course as 40 grit and with that you might not need a $20 reamer. Just a 40 grit wheel and a 150 grit then polish it with something like 600 or 800 and you would be great.
 
Mike W

Mike W

Infidel
Location
North Florida
Speedfreak said:
No problem. Since I done that manifold I have found flap wheel disk as course as 40 grit and with that you might not need a $20 reamer. Just a 40 grit wheel and a 150 grit then polish it with something like 600 or 800 and you would be great.
Click to expand...

I just finished opening it up to 47mm. It didn't take long at all. I didn't take too much off the inside where these manifolds tend to crack just below the threaded hole that runs all the way through. It is pretty thin there already. All I need to do now is get the sanding disk and clean it up a little and find a ski to put it on....:banghead:
 
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