RIJVETTES

Hey guys, I need your help with a cam selection that will pass smog test in California. I have an 80 with a rebuilt 355, 750 QJet, Edelbrock Performer EGR manifold and 64cc aluminum heads, KB hyper 12cc dish pistons, stock exhaust manifolds, AIR pump, a new 3" Magnaflow cat and 2 1/2" exhaust. I figure about 9.5 CR. I currently have the mildest Lunati VooDoo cam: 207/213 @.050, 112 LSA I like this cam, but. do you think I will offend the smog police with a slight bump up to the next VooDoo 113/119 @ .050, 112 LSA and .454/.468 lift? I just want a torquey street engine, but I gotta pass smog. Also, what size cam do you run and still pass the test? Thanks.

fauxrs2

This is the cam I run right now - its a hyd roller though - prior to that I ran a Schnieder custom grind...basicly an L82 cam but ground on 110 centers instead of 112.

Both smog fine.

RIJVETTES

Thanks Eric. Looks like I may be alright. Anyone else out there? What cam and engine combo do you run, and still pass smog?

gkull

This Crane 272 with 1.6 roller tip rockers passed for me every year.

It is a 216/228 112 LSA You can always do little things for the test like pull off the full vacuum line on the side of the carb to the vacuum brakes and just for the test instantly lean out the mixture if you are high on hydrocarbons or if you are high on CO or NO's you can retard the timing for the test. With any of these mild cams it is not the cam that determines whether you pass or fail it is the state of tune, fresh oil, clean air cleaner that makes the difference.

Part Number: 113941 Grind Number: H-272-2 (REPLACES HMV-272-2)
Engine Identification:
Start Yr. End Yr. Make Cyl Description
1957 1987 CHEVROLET 8 GOOD IDLE, FOR 350+ CU. IN. MODIFIED ENGINES WITH FREE-FLOWING ABOVE WATER EXHAUST SYSTEMS FOR PERFORMANCE APPLICATIONS IN LIGHT PLEASURE AND SKI BOATS, INCLUDING JET BOATS, 8.75 TO 10.75 COMPRESSION RATIO ADVISED (C.A.R.B. E.O. D-225-18). BASIC RPM 2000-5000
Engine Size Configuration
262-400 C.I. V
Valve Setting: Intake .000 Exhaust .000 HOT
Lift: Intake @Cam 3027 @Valve 454 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 3200 @Valve 480
Rocker Arm Ratio 1.50
Cam Timing: TAPPET @.004
Lift: Opens Closes ADV Duration
Intake 25 BTDC 67 ABDC 272 °
Exhaust 75 BBDC 29 ATDC 284 °
Spring Requirements: Triple Dual Outer Inner
Part Number 99848
Loads Closed 114 LBS @ 1.700 or 1 45/64
Open 318 LBS @ 1.240

Recommended RPM range with matching components
Minimum RPM 1800
Maximum RPM 5600
Valve Float 6200
Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 1 BTDC 35 ABDC 107 216 °
Exhaust 51 BBDC (3) BTDC 117 228 °