89formula350b2l

iTrader: (11)

I most liklely wont get to do this before I leave the states, but I can plan for it when I get back I've heard on this board of alot of 383's with AFR heads going 11.7-11.8 with the xr288. Right now I have a smaller cam, xr276. I'm hoping for 12 flat. I know the HSR and Longtubes and AFR's would love a bigger cam. Which one would suit my combo better?

ZZ-X Hyd Roller:
Advertised Duration 290/290
Duration @.050 239/239
Gross Lift .558/.558
Lobe Seperation 112

xr288 comp cams
advertised duration : 288 294
duration @.05 236/242
Valve Lift .52/.54
Lobe seperation 110

Xr288-http://www.compcams.com/Cam_Specs/CamDetails.aspx?csid=190&sb=2

z28freak84

xe or even an XFI grind of similar duration.

89formula350b2l

iTrader: (11)

any other opinions? open to anything

89formula350b2l

iTrader: (11)

no other opinions?

89formula350b2l

iTrader: (11)

no other opinions?

squeeezer

that xe 288 is a great cam all around i have one in my 355

89formula350b2l

iTrader: (11)

u mean the xr288 ? didnt know they made a xe288

HawkHunter

i think the xr288 would sound cooler ;p the zz-x would probably produce more power @ a higher rpm though - if you go by your stall - you could run a pretty hot cam there... why not go with a trickflow specialies 31402002... 246/254 @050 ... not very street-able, but then you asked for an opinion summit racing has one here

edit: im putting a 243/257 .5/.486 valve lift 107 lobe seperation into my 383 - it's got shorty headers, true dual exaust and a 2600 stall... although im trying to find a 2800-3000 stall for it, and 4.10 gears so the torque will lock up at cruise speed... i have 373s

squeeezer

my bad yes hydraulic roller xr 288

Orr89RocZ

iTrader: (20)

i dont think you'll notice too much difference between the two cams but power edge probly favors the 288HR



The Comp 288 is on a 110 lsa. should idle pretty rough and require a good tune to handle that. My custom grind for my 383 HSR is on a 109 lsa tho

The 288 advertised overlap is 71 while zzx is 66 at advertised. The 288 overlap at .050" is 19 while the ZZx is 15. My cam is a 78 and 19.5 respectively and it was designed to make max power at high rpms over 6000.

So while it may seem the slight extra intake duration of the ZZX will want to rev higher, in fact the 288 will favor the upper rpms due to more overlap. It will have a meaner rougher idle than the zzx but both will sound good.

The 288 has slightly more aggressive lobes for more area under the curve lift. That will help boost lower rpm torque.

I think the 288 has a slight edge over the ZZX but you cant go wrong with either.



EDIT: also with your AFR heads i'd run 1.6 rockers on the 288 to get the lift up where it belongs..in the high .500's. AFR's flow well to .550-.600 so cam lift in there would be great. I dont recall if that ZZX lift is with 1.5 rockers or 1.6's. if its with 1.5s, then 1.6's will boost lift to near .595 will require great valve springs to handle that but could benefit you. Either cam will need good springs, i'm not sure what AFR springs you have currently but the new eliminator 8017's are decent springs while the upgrade 8019 are preffered for these big high revving cams. Thats the spring i'm using for my custom grind

89formula350b2l

iTrader: (11)

its close with mt 1.6 rockers and i cant remember if the guy i got the AFR's from replaced the springs with soemthing better, so i am replacing the springs. I was pretty set on the xr288 anyways, but doesn't hurt to ask for opinions from people