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Originally Posted by Don
Byron:
Any thoughts regarding my specific engine:
351W .030 over
Edlebrock Performer Intake
Holly 600 carb
9.5 Compression, 1.94 intake
Ford GT heads
MSD 6A Ignition
MSD Distributor
Cam: I do not have the specs, not radical, from the old days, probably a 3/4 race cam.
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Unfortunately, the most critical part listed in regard to emissions is an unknown. The cam will make or break you...the rest of the parts are fine, provided you tune the mixture in so it's running 14.7:1 AFR during the test conditions, and the engine is hot and not too advanced. I'd recommend 15-20deg BTDC of spark during test conditions (lock the distributor if you must), and 14.7:1 AFR, factory heat-range plugs and a 180+deg thermostat. Run the test on a thorougly warm engine...water temp 180+. If the cam doesn't have much overlap, it will pass as long as the engine is not misfiring. If the cam has considerable overlap, it won't pass...period.
Gut feeling on the cam might give you some idea...
What does it sound like at idle? (heavy lope, no lope, smooth idle)
What is the minimum idle rpm that it will stay running?
How much vacuum can you generate at an 800rpm closed-throttle idle?
If you can't get it to idle below 800rpm and/or it has enough lope that you can see the tach bouncing around, your odds are not so good. If the idle vacuum is much under 12" Hg, I'd worry some as well.
Additionally, there's a variety of bottle-products out there that can be added to the tank for just such a purpose that cause combustion to be far more complete. HC's are hydrocarbons...unburned fuel. If you fail the test by a narrow margin, the addition of this might be enough to push you over the edge.
Good luck with it.
Byron