Topic: 750 Cams, Valve springs and cam tower questions

[Garage_guy_chris]

I have been piecing together a 836 and I have been considering my cam and valve spring selection. I have noticed a lot of talk about heli-coiling the cam tower bolts and/or the custom valve covers with welded in hold down bolts.

My question is when these steps are required?
-at what point do you need to heli-coil the threads?
-at what point do you need to add a valve cover with hold downs?

Im thinking one of these cams:
-69 K0 stocker    < no need for any modifications
-F2 stocker         < no need for any modifications
-DP117KHD        w/ HD springs
-Webcam #41    w/ HD springs
-Webcam #41a  w/ HD springs
-APE H360          w/ HD springs

[Bill/BentON Racing]

Most time helicoil as needed. No threads or won't hold torque. I guess you could just helicoil them all, but I haven't found or thought that nessecary. Lot of setups out there without cam tower supports. You would probably be just fine without them.Bill

[BPellerine]

got an f2/3 stock cam if needed.bill

[Garage_guy_chris]

the existing threads in the aluminum are just fine there not stripped or anything. But in a few threads/posts sounds like some people are drilling out good threads and heli-coiling for extra hold down strength?

will i need to look for extra hold down strength for any of these cam valve sping combo's or will the original alumimun threads be sufficient

 

Im thinking one of these cams:
-69 K0 stocker    < no need for any modifications
-F2 stocker         < no need for any modifications
-DP117KHD        w/ HD springs
-Webcam #41    w/ HD springs
-Webcam #41a  w/ HD springs
-APE H360          w/ HD springs

[Bill/BentON Racing]

They should be fine.

[Don R]

 I had an F2 in my 836. I liked it but was close on valve piston clearance and tagged a valve on a missed shift. (having a little too much fun) Anyway when it went back together I used a Kenny harmon F cam and springs, (lots bigger) I haven't ridden it much since then DUE TO WINTER but The honda F2 cam may have been better at lower rpm's.

[MRieck]

the existing threads in the aluminum are just fine there not stripped or anything. But in a few threads/posts sounds like some people are drilling out good threads and heli-coiling for extra hold down strength?

will i need to look for extra hold down strength for any of these cam valve sping combo's or will the original alumimun threads be sufficient

 

Im thinking one of these cams:
-69 K0 stocker    < no need for any modifications
-F2 stocker         < no need for any modifications
-DP117KHD        w/ HD springs
-Webcam #41    w/ HD springs
-Webcam #41a  w/ HD springs
-APE H360          w/ HD springs

I helicoil the 4 long cam tower bolt holes for large cams, Inserts are 12mm long. It is a PITA to do the doweled holes. The studs need no attention.