1988 Irocz L98

Stock heads have been fully ported gasket matched to Felpro 1205, 3 angle valve job.

Milled to lower the cc to 60cc. FelPro copper head gaskets .039" thickness

1.6 roller tip rockers

stock cam

Holley Stealth Ram intake ported and gasket matched to FelPro 1205

52mm TB, with coolent bypass

Ram air airbox mod with K&N's Ported MAF

Headmen shorty headers, y pipe, Catco cat 3" cat back with Dyno max muffler.

MSD Coil, cap, wires

LS1 28.5lb injectors

Smog pump delete

Custom chip

TH700r4

9 bolt rear with 3.27 gears



I was thinking a HOT cam, or bigger?

What about this guy?


Cam Spec Card Inquiry
PART NO. 12-367-4
01 INTAKE MASTER 5088
02 EXHAUST MASTER 5107
03 ENGINE CS 280XFI H-13
04 GRIND NUMBER CS 280XFI H-13

INT EXH
05 HYDRAULIC Y/N YES 14 DUR @.050
236 241
INTAKE EXHAUST 15 LOBE LIFT .3450
.3420
06 VALVE ADJUSTMENT HYD HYD 16 ROCKER RATIO
1.60 1.60
07 MAX GROSS VALVE LIFT .552 .547
08 DUR @ .006 TAPPET LIFT 280 290 17 LOBE SEPARATI 113.0
18 ADVANCE 4
09 VALVE TIMING OPEN CLOSE 19 VALVE SPRINGS 26918
@ .006 10 INT 31 69
11 EXH 82 28 DATE SETUP 10/18/2004
12 THESE SPECS ARE FOR CAM(S) INSTALLED
@ 109.0 INTAKE CENTERLINE

13 REMARKS

What stall you running? Need to match the cam to the stall and rear gear to get the best results. I am running a 2600 stall 3.73 rear gear and 350ci with HSR and a hot cam, great street combo but would like a little more up top.

Stock stall now, but planning on a 2500 -3000 Jegs 9". Rear gear is 3.27.

A guy in our club has this cam to get rid of, 224/224 @.050 .525/.525 110LSA I run 1.6 rockers bumping it to .560 lift.

Looks a little closer to my app. Not to sure about the 110 LSA though.

Head flow numbers would be a big help in deciding what size cam to run. Then you can pick a cam, then a converter size and gearing... It all works in a process.

How much lift can you heads take?

0.600"

I am running 1.6 rockers.

But do they flow up to .600" or do they peak at .550"? Makes a huge difference in picking a cam. The cam I picked I got b/c my heads peaked right around .550" lift, but not as much peaked as plateaued. So the .560"/.569" lift is perfect. I have a ton of dwell time at the PEAK lift numbers, or at least near them. I hit peak lift basically 2, before max lift and after, but in reality just stay at the 267 lift I got at .550" on the flowbench for a lot of the top of the cam lobe.

Thats the key. The amount of "dwell" time/degrees that the cam lift is over the maximum flow of the heads. That's why I like the new Comp Cams XFI cams.

I'll have to dig up the flow charts for the heads. Seems like they peaked around .550 though.