Just finishing up a 600 cc long rod stroker trx engine and have several cams varying from 108 lobe centers to 116.And durations 260 to 280.Lifts from 400 to 450,and Compression is at 14-1!Which to use? Max rpm to be 9250!

a big one!

isnt there a stage 3 hot cam out?

what about the johnson cam?

Yes , I have both a stage 3 hot cam and keith just sent me his big one! Keiths cams kick a$$ in the stock stroke engines 64.8 stroke and in the new 06 engine 62 mil stroke I guess I will have to try both!

whatever cam you choose to pick, get one with big amount of duration on the intake, and try to keep the exhaust open as much as possible with the least amount of lift, you really don't need to have huge amounts of lift to get good power, it's just that once you have a cam that has 278 degress of duration or any other big came that lift is typically a byproduct of cam with that much duration, I usually run cams with maybe 435'' lift and 269 degrees of duration at the max in most engines and then after that if I need more botttom, mid or top I will tune with different lobe centers to get the power where I want it,
Mega Cycle or Web Cam are great companies to deal with, alot of the times if you come up with own numbers and call either of the two they usually will have a master or one very close, and then it won't cost a fortune to get a cam ground, and if they don't have a master and you want a cam ground your talking big money, all I can say is that if you can afford it try a couple of different cams, a good set of cams will make or break a four stroke engine.

Be careful not to over cam it.

i didnt here that some body did the 600cc .. from where did you get it
what is the bore ?
and
what is the stroke ?

Yes, you heard correct and today I beat it up at the sand drags pismo and it still is runnig! It is a custom job alot of work 101 bore and 74.8 stroke! I believe me and NMOTION HAVE 1 mine is a long rod version will have video on there website next week!Still figuring out cams had a small one in today made ok power but motor was also tight so we will see!

are you going to be back out at pismo this next weekend?

I dont know just tore the engine down to do an inpection had alot a metal in filter everything componant wise looks great piston cylinder crank so I may depending if the big valve head arrives this week!Alredy have the cam the small one did not work out so I hope this longer duration comes in play with the 10 mill stroke better!

Go with the big Johnson, .435 lift I think it is. With the stroker, you'll want something with a more duration than usual. The HC3 might work alright but I think I'd go with something bigger. .410 plus lift and a lot of duration.

My personal favorite is the Megacycle X1 but it doesn't sound like you have one. .430 intake lift, good duration and it runs hard from bottom to top.

what are you doing to make the head capable to flow the cfm for 600cc's? would take some serious head mods to make a difference.

I had a stock head on it mild porting with a hot cam and it was at 65 hp! Now I have plus 1 intake plus 3 exhaust and a big custom ground johnson cam with the rev to 10250! This engine revs as quick as all my other stroker Hondas Ive built!And people that know me know I am abusive to my stuff and I tortured that thing with no break in and it is good as new still. This thing will put out 70 plus hp on gas And thats alot !and still be reliable!