I have a 327 Chevy engine in my 4wd 88 Silverado
I ended up putting a Q-Jet and a 327 in it which is built close to factory specs with the exception of shorty headers and a performer intake with a Q-Jet that has #s matching a '68 truck.
The block is zero decked and the crank is balanced and it has a Melling cam with 204deg intake @ .050 and 214 exh @ .050.
So it's mildly built - I calculated the CR and it's about 8.5:1.
Anyhow - The fuel consumption is acceptable @ about 15 mpg combined hwy/city driving, but mostly hwy.
It's not octane sensitive and it performs a little better than I expected it to when I floor it, and drivability is good.
But when it idles it stinks and burns my eyes.
The carb is one that I picked up from a friend's box of parts, so possibly he put the incorrect idle screws into it, because the idle screws are closed, but I'm guesssing it's rich.
I tried removing the springs just to be sure the screws weren't bottoming out on the springs.
What should I do?
I don't have any exh gas analyzer.
I also have an MSD dialthat allows me to adjust the ignition timing from in the cab
The engine has 8000 mi since the rebuild.
I did use a vaccum ga for tuning but I am thinking that with the idle mix screws being turned all the way to the seat and it still smelling rich, that is limiting what I can accomplish.
Thanks
