84z.defender

i have an 84z with
010 block 355
200cc world sportsman2 heads 1.5 rollers
chevy pink rods
shorty headers into 3" out 2.5
street dominator with 1" wilson spacer
670 street avenger with some work
msd box 6al pro billet dist, blaster 2 coil
tko 600 with short gears
410 spool


so i want a lumpy cam , not sure wut cam is in the motor now , as i got it from a buddy. i drive hard and dont see the hwy much , but i do see the track from time to time , my question is for my set up wut cam should i run . pls give me ur imput

thanks sean

86LG4Bird

iTrader: (1)

Flat tappet or HR?
CR?
What rpm are you willing to turn?
ie. unless there's a whole lot more to it than "chevy pink rods", I wouldn't be aiming for 7000!

Is it .010" over or is it a 355 ?

84z.defender

HR , and yes i be leave it was bored and honed ,from the stock 010 block to make it a 355, my main problem is i dont know whats in in for pistons, and im not ripping her all apart to find out, i use to have a rpm cam that was 488-510, so i want the most lump i can get with out completely killing my vacume

Damon

The old iron Sportsman II heads flowed decent on the intake but lousy on the exhaust. Use a cam with about 6-8* more exhaust duration than intake. Something like the Comp XE274 would be in the ballapark of making optimum power, assuming the motor was built with anything close to 10:1 compression (flattop pistons, 64cc chambers in the heads). It'll be plenty "choppy" at idle but still make enough vacuum to keep the power brakes happy. Barely.

If in doubt, step down a notch to something like the Comp XE268. Even with lower compression, say around 9:1 it should still belt out plenty of midrange torque.

Ozz1967

iTrader: (4)

I have the world Sportsman II heads. I"m running a Lunati 60121 Cam. It's not a "lumpty lump" cam, but it has a little rumble to it that's noticeable. Otherwise It sounds like we have a very similar motor build.

Also, if you port the exhaust side of the Sportsmans, they come within 20% of the equivalent AFR's according to one of the flow-charts I came across.

84z.defender

looking at the xe288 comp cam, maybe too much?