Glen

What cam duration and lifts are you guys getting through the emissions test with? I have an L-98 with World SR Torquers and a comp cam with .450/.480 and 206/210 at .050" lift. I am due for my first emissions test on my new engine rebuild in January and went kind of conservative on the cam for fear of failure on the test. I hate emissions requirements.

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'85 Sport Coupe V6 T5(bought new)Put in 88 350 TPI/700R4 and a bunch of 88 IROC and aftermarket performance parts.

IROCZZ3

I'm running a ZZ3 cam and it passed CA emissions last year using a stock chip.

Specs with 1.6 roller rockers...
Duration: 208/221 @ .050" lift
Lift: .505"/.544"
LSA: 112

You should do fine with your cam as long as you have functional cats. I plan on installing an LPE 219 cam...

219/219 @ .050", .560/.560 lift w/1.6 rockers.

I've heard of people passing smog easily with this cam...same goes with the HOT cam.

Hopefully this will give you some idea how big a cam you can go and still pass smog.

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1989 IROC-Z, ZZ3 shortblock with some bolt-ons.
13.20 @ 108.69, 2.2 60'

Glen

Thanks a million. I see that you can go quite a bit more radical than I chose to go with mine. Maybe I can sqeak a little more out of mine with some 1.6 rockers though.

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'85 Sport Coupe V6 T5(bought new)Put in 88 350 TPI/700R4 and a bunch of 88 IROC and aftermarket performance parts.

camaro1j

iTrader: (1)

I don't think cam size has anything to do with emisions..528 lift and 292.0 duration. My emisions are HC 24, CO-% .36, NO-ppm is 229 and I have 1.6 rocker arms. I have 450-500 hp. I think as long as you have a good fuel managment system you will be fine.

P.S. I don't have any emisions equipment.

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406
accel supper ram
6000 rpm Hyd roller cam
afr heads
t-56 trans
9" ME rearend

TRAXION

Ummmm ... you are utterly and completely wrong. Cam Size (duration, lift, LSA, etc) has an INCREDIBLE amount to do with emissions.

Tim

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TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org

[This message has been edited by TRAXION (edited May 02, 2001).]

lb9formula91

how much did it cost you guys to get your cams installed or if you did it yourself, how long did it take?

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91 formula
305 tpi
borla exhaust
white face gauges
home made cold air
tpis airfoil

eddie89TA

glen.... how do u like those heads?which ones r they the 67cc or 76cc? i am seriosly considering those heads.. did they bolt on no problem? what head gaskets did u use?(compressed thickness)
thanks ed

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white/gold GTA ,leather 5.7TPI 700r4 3:27posi twin cats,3"catback,aluminum d.shaft ported plennum,afpr,8mmwires,k&Nand all other "free" mods, performance resource chip,SLP cold air intake.

Glen

I chose the 76cc SR Torquers because of the extremely hot summers here in Phoenix and I know of several crack/warp problems some friends have had mixing metals. The heads were $759 from PAW and I had read several books (Lingenfelter etc.) that talked pretty highly of them. I put them on when I built the engine and had no problems whatsoever. I chose the Kieth Black KB120 pistons and a felpro composition gasket (.035 compressed thickness). When I had the machine work done on the engine I had the block decked to about .005 which puts the quench area thickness about .040 or so.

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'85 Sport Coupe V6 T5(bought new)Put in 88 350 TPI/700R4 and a bunch of 88 IROC and aftermarket performance parts.

Glen

Oh yeah, so far I really like them alot. I'm still breaking the engine in so I can't get too radical yet. )

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'85 Sport Coupe V6 T5(bought new)Put in 88 350 TPI/700R4 and a bunch of 88 IROC and aftermarket performance parts.

TunedPort350

Comp Cams hyd. roller cam
Lift = .520I/.540E
Duration @ 0.050 = 236I/242E
L.S.A. = 110


Good working Random Tech. Cat.
Passed emissions without any problems.

eddie89TA

did going to 76cc chambers kill compression?? my L98 r 64cc stock and i am planning the 67cc pre 87 heads with 2.02 valves. thanks ed.

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white/gold GTA ,leather 5.7TPI 700r4 3:27posi twin cats,3"catback,aluminum d.shaft ported plennum,afpr,8mmwires,k&Nand all other "free" mods, performance resource chip,SLP cold air intake.

Glen

I chose the pistons to go with the heads. The KB 120's have two valve reliefs and make about a 9.1:1 with the 76cc heads. There is one thing about the heads though. The World Products spec. sheet (on the worldcastings.com website) shows a max lift of .500" on the left side of the page and an installed height of 1.75" and in the FAQ section on the right side they show max. to be .560" at installed height of 1.820". I emailed them and they said the .560" was correct. I probably would have gotten a higher lift cam had I known. I didn't measure the installed height when I put it all together. Maybe someone on this board knows the actual measurement. The cam I chose seems to work very well for a mild street build up. The stock TPI setup limits the top end anyway and I didn't feel like going to the SuperRam and all of the $$$$ it meant.

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'85 Sport Coupe V6 T5(bought new)Put in 88 350 TPI/700R4 and a bunch of 88 IROC and aftermarket performance parts.

eddie89TA

r u gettin decent mileage with it? will it pass emmisions? the cam i am planning only has .460 lift.

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white/gold GTA ,leather 5.7TPI 700r4 3:27posi twin cats,3"catback,aluminum d.shaft ported plennum,afpr,8mmwires,k&Nand all other "free" mods, performance resource chip,SLP cold air intake.

Glen

I think it's pretty much broken in by now (1500 miles on new rebuild) and I'm getting 15 MPG. That's about what I expected to get. I don't have to get it emissions tested until January. We'll see.

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'85 Sport Coupe V6 T5(bought new)Put in 88 350 TPI/700R4 and a bunch of 88 IROC and aftermarket performance parts.