GTA

Hi all
I have been thinking bout going with a different set up, here is the current one. Stock L98 short block, AFR 180 58 cc heads, 1.6 pro mag rr 1/58 slp shorties. Super Ram intake with ported Accell base, and a 0.28 tpis head gasket. Comp 211/218 .488/.495 on a 112 . I am running Ford #24 injectors with a EBLP4 ecm, My thoughts are going to a slightly bigger cam I called comp and they recomended a #268 XFI.....i am already using a comp 264 ...seems like a lot of work for a lil better cam, so they question is who has used what in a SR and what would run great on the street and really crank some heat into these old goodyears? thx GTA......

watajob

iTrader: (29)

I don't know much about the SR's but while the 268 isn't much more duration than the 264 it's a boatload more lift which will make a noticeable difference and what the tech at Comp was probably considering. BTW, are those heads shaved? I've never heard of a 58 cc AFR.

GTA

58cc yes they were shaved upon my request when i ordered them

Orr89RocZ

iTrader: (20)

268 seems to work well in alot of combos. Its got a good bit of lift for the duration and will require a good valvespring. It pulls to 6000 rpm so its a good match for the SR. Also there is the lingenfelter 219 cam that is proven to work well. Both should give a good bit more power over what you have now.

Could go tad larger but not sure the gains will be there with the 180 head and the limited rpm range of a stock shortblock and SR

GTA

orr, if you had the choice what would you do the old design 219 or the newer 268?

Orr89RocZ

iTrader: (20)

If i could find the 219 used i would do it. But theres good chance the 268 can be had on forums classifieds too. Thats what id do, is find either as cheap as i could before buying new. Then if new id buy the 268 and try that. It should be a decent step up as you have decent compression with 58cc heads. The lift will help the top end and extra duration as well. 219 is abit bigger cam by advertised durations so it will want to pull alittle higher and or hold onto power a tad longer so you can raise shift point.
Its kinda of a toss up between the two on that motor. Power should be real close between the two

Orr89RocZ

iTrader: (20)

To add you are more likely to float the valves with a xfi lobe versus 219 cam. Afr 180 should have either 8017 springs or upgraded springs to the 8019. 8019 is preferred for xfi cams to 6500 rpm. 8017's have abit less pressure but should be ok to 6200 or so with the 268. Afr valves are light so you shouldnt have an issue but xfi is pretty aggressive.

GTA

hmm, guess i better start looking and pricing out cams, any idea on power?

any one want to sell a268 or 219 cam?

skinny z

Any idea what you have for a compression ratio?
That'll certainly influence your cam selection.

(I won't get into DCR, Orr!)

GTA

not really sure on comp im gonna guess between 10.3 and 10.5 to 1

Orr89RocZ

iTrader: (20)

Lol bring that into consideration it certainly has merit. But i believe with afr head chambers you can get away with alot of scr and dcr. They seem to require less timing than comparable builds with other heads. I ran 11 to 1 on 93 oct gas with a comfortable dcr of 8.3, but that motor did run fine at 89-91 oct that i initially had in the tank at 36 deg cruise. The wot 93 oct tune took 34 deg to make max power but it handled 39 deg with no signs of knock retard. It didnt pick up at track but still ran it ok.
The chambers seem to burn pretty efficiently and dont need alot of timing but do seem to be somewhat detonation resistant if you will.

L98 vettes at 58cc were close to 10 to 1 comp. some L98 had 7cc flat tops other older ones had 12 cc dish. So you could be 9.8-10.6 to one. I think either cam will work fine on that motor with pump gas

LB9GTA

iTrader: (1)

Dont buy a used cam, buy it new.

I have the xfi280 cam and it is agressive on valve springs.

That xfi268 should work better for you, but you need to figure out your traction issues before you get more power.

Spinning ain't winning......

GTA

i have no plan to ever race it, this is just for me, thanks for all the suggestions so far, ....GTA

LB9GTA

iTrader: (1)

Did you buy a cam yet?

GTA

no

new idea now ....to stop wasteing money and leave it alone