91z28-350

Does anyone know the valve events on this cam?

54-444-11 XER273HR

I'm trying to determine if this cam will pass CA smog.

SPIV

You can log onto the Comp cams web site and quote the grind no. and it will list the specs.

Even so I doubt that it will pass smog.

jrp

iTrader: (16)

a 114lsa will have -1* overlap @ .050. can it pass, im sure with the right tune and all the tricks. however, the chance that it might not far out weighs the potential hp gain over a cam thats already known to pass. keeep i mind, smog tests are only going to get harder...

91z28-350

Already checked before posting. It's not on the site. Need to call for the specs, so it said.

I figured too, but I don't know anyone running it.

PREDATOR-Z

What is the lsa and advance?
But like Jerami said, with the right tuning, leaning it and more advance timing, ie: leaner stoich, fresh cats and plugs, it will pass.

oztrack

Does installing one of these cams at ICL of 114 have a negative effect on idle quality?
Also will it be oK with P&V clearnance if the LS1 heads have been milled 0.030

Formulated

iTrader: (16)

I had one of those cams, and just sold it. The cam card indicated that the straight up valve timing was on a 112 intake lobe center. The valve events listed were all at 0.006 lift, and I can't remember what they were. It should be a nice cam, though. I was intending on using it with stock cats, and I think the longer exhaust side should help that out. I'm in california as well, and I'm positive it will pass with a good tune. You just have to be diligent about it.

helicoil

iTrader: (104)

Just installed this cam on a 346 with AFR 205's milled .038" and a .040" gasket and had .095" piston to valve on the intake and so much on the exhaust it was no worry whatsoever.

This cam installed straight up dot to dot out of the box was on a 111 ICL. Comp must grind 3* into it, which is fairly normal for most shelf grinds.

I believe Tony Mamo's AFR cam which is the same, just a little smaller on the exhaust 228 made the most HP installed at a 113 ICL. I installed mine at -2 on my lower gear and ended up with a 112.5 ICL Works for me. The valve events were spot on for this compared to the card and the calculators when I degreed them.

Installed at a 113 ICL the valve events at .050" are as follows.

Intake OPENS -1 BTDC
Intake CLOSES 45 ABDC
Exhaust OPENS 50 BBDC
Exhaust closes 0 ATDC

Overlap -1

PREDATOR-Z

AFR 205s have more PTV clearance than GM castings
Straight up means on 0 advance like 114+0 (114LSA/114 ICL)
+4 is the norm in grind advance

helicoil

iTrader: (104)

Yes, you are correct. I was only mentioning that the cam referenced (Comp 54-444-11) has 3 degrees of advance ground into it and installed dot to dot on on a non-adjustable timing chain and has an ICL of 111 at this location. So even though it was installed 'straight up' it is in the engine +3.

When I mention 'straight up' I am only referencing the 0* timing marks or dots on the timing chain.

I wish there was a 'norm' on advance ground in by the manufacturers, but over the years I have seen anywhere from 2-5 degrees on shelf type cams. Some manufacturers hold tighter tolerances than others. Speaking primarily from experiences on SBC's, SBF'c and BBC's.

Always best to check.

BTW, to the original poster the lobe numbers on this cam are 3722 and 3725 if you wanted to go the Comp website and get more info.

Atech (Summit) stocks this cam and I only paid 326.00 for it.