Thread: cam switching: 4-2-1 vs 4-1

Using a set of 4-1 on a worked 20ve, from reading it sounds like the cam switching has to be raised a fair bit compared to using some 4-2-1 extractors, is this correct?

I'm building the motor for circuit sprints so don't want the cams switching too high leading to dropping of the high cam on gear changes.

Thanks in advance.

it all depends on the header. mikos header likes the switch at around 4800 i beleive. and some of the 4-2-1 like it around 5, my header i have to switch my cams around 5700....

Which header do you use?

its a custom 4-1

You guys may be losing some switching that high - I bought the infamous 421 Fuji when you could still find them. Beautiful piece of engineering. Might indeed lose lower end power with a 4-1 so you need to switch higher, don't know. Never dynoed mine. I switch at 4600 with my setup - might go to 4800 as that's when it spins the tires loose in 1st after it hits the cams - - - -. Seems to me you want to USE the upper cams some - having only a very few revs on the uppers before you get into make me a cheap anchor territory seems a shame.