Performance upgrades.

[1985CB450_imp]

not to fan the flames but from my experience, the head (and valves) on these bikes, and the compression ratio is the main offender in the motor holding back HP after opening up the TB restriction, exhaust, and then of course fuel mapping. Have said it for years. I actually have a spare head i bought a few yrs ago I may eventually dig into, deck, and get some bigger valves put in after i port it. But, im also not chasing HP on this really, so thats why i haven't done it, i might get bored enough one day to tear into it but im sure that's years down the road for me. You're only going to squeeze so much thru those valves @ that size. .02

Yes sir thanks for weighing in

Too much cam without enough compression is prob the #1 mistake in doing cam upgrades. It’s the reason most large cam companies will spec the min compression ratio required when selecting a particular grind

The original motor in my 69 vette was the L-46 350ci rated 350 hp with 11-1 compression. The stock GM camshaft was 224 degrees duration at .050…Granted that was back in the days of 103 octane fuel but still pretty impressive nonetheless considering they were running iron heads. Absolutely no way to get by with that now on the junk pump gas we use today