1978 cb750F3 exhaust guides

[garyS-NJ]

Yes mine are a little tired so I'm looking at the cycle-X extra long (49.5mm) cast guides or bronze guides from APE or Dynoman. I'm hearing the Cycle-X guides mfr'd by Kibblewhite were designed to address the F2/3 design issue but others are saying go bronze/. I'm thinking the cast might be more durable if I ride like a granny but the bronze will be more durable if I do a lot of riding around 7k R's (with the occasional high speed runs and top end blasts). And if bronze is better (Manley recommends cast for street and bronze for racing), why didn't cycle-X get their long guides made from bronze? any suggestions on which way to go and sources?? Oh, and what about ampco45 vs C63000 guides (Dynoman offers both).

 and then I might need some valves or take the plunge for a full set aftermarket (I'm already buying the titanium retainers.). APE has the iconel Stainless and Dynoman has the nitrided stainless. haven't found anyone with a hard chrome stems. Any suggestions on valves and is there any issue of matching valve stem material to valve guide material?? Manley for Harley says their Nitrided Valves are compatible with their cast or bronze guides but TRW site talks about different stem coatings for different guide material. What is the common knowledge for the F2/3 head and for valves to work in those guides..??
 garyS

[TOOLS1]

Just go Cycle-X. They specialize in SOHC CB 750's and have done all the testing, and research on these engines over several years of racing, and have found what works, and what does not.
TOOLS