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how much cam lift with stock guides?

  • Thread starter Thread starter gearhead13
  • Start date Start date
G

gearhead13

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How much cam lift can I run with stock guides? A G4 has .355 lift is that ok or even the .370 lift web cams. The APE site says anything OVER .370" lift needs shorter guides, so is .370 lift ok?
 
With .370s you risk the retainers hitting the guides if you have an over rev. I don't like running more lift than the G4s with stock guides.
Ray.
 
4th gear Wheelies... and a wish for wheelie bars or a longer swing arm...I am converting my race bike back to a street bike. I might sell the longer swing arm... I run .380 intake and .355 exhaust. Got them from Ray... Cammotion G21 and G25.
http://www.youtube.com/watch?v=lByQl1w-QtM
 
Last edited:
bellucci said:
4th gear Wheelies... and a wish for wheelie bars or a longer swing arm...I am converting my race bike back to a street bike. I might sell the longer swing arm... I run .380 intake and .355 exhaust. Got them from Ray... Cammotion G21 and G25.
http://www.youtube.com/watch?v=lByQl1w-QtM
Click to expand...
Interesting choice of cams. When I see higher Cam Motion numbers I always think they are quite big cams. But they have not much more duration than what I have but higher lift, so you keep the low end and add top end with the higher lift.
 
The original cams were from Andrews. They bailed and went Harley only... Still nice guys. The cams were chosen by the guys at Cammotion to try and match the old ones... I am not sure whether the are enough. If I ever get on a dyno, I will maybe be able to figure it out...
Curt
 
Question: can I run .370 lift cams with the APE titanium retainers that the site says they give 0.030 more clearance?
 
This is an old thread... I would send a msg to Rapid Ray for his take on the retainers...
 
gearhead13 said:
Question: can I run .370 lift cams with the APE titanium retainers that the site says they give 0.030 more clearance?
Click to expand...

Yes you can run a .370 lift cam as long as you use the retainers and I prefer the APE stuff
 
stetracer said:
Yes you can run a .370 lift cam as long as you use the retainers and I prefer the APE stuff
Click to expand...
Can I just have my stock retainers machined down 0.030"?
What clearance is needed between the retainer and guide?
 
ive had the stock retainers break with higher lift cams and stronger springs (maybe just bad luck on my part) but i havent risked it since I think he is correct about the higher lift being ok with the ape retainers ape could verify, also be sure to ck for the keepers sticking out below the retainers and possibly hitting the top of the valve seal or the guide your idea was a common trick we used on the 2 valve 900 and 1000 kaws
 
I have a set of cams here stamped "212" but checking the lift at the valve and it is only 0.350" I think these have been reground for less lift. The lobe lift is 0.240 and the base circle measures at 1.052" with calipers. Anyone know what the base circle is for 212's? They could be mislabled 168 cams, but I would be able to tell by the size of the the base circle. They are not just worn out cams, the lobes are in decent shape.
 
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