[V8Vairs] Backfire through the carb...

[Ed Dowds]

I have watched a discussion of ported vs. manifold vacuum on two streetrod 
forums that I follow. There are arguments back and forth.
I run a 350 SBC with the Edelbrock carb in my streetrod. I don't have 
backfiring thru the carb. This is the same setup that Tony has in his car. I 
run manifold vacuum.
All the SBC's, before they started emmision tuning, used manifold vacuum. 
Later, with emmision tuning, they started running the vacuum thru a temp 
sensor so the dist only got manifold vacuum once the engine got hot.
In 1973, when I was young and inexperienced (stupid!), I bought my '69 
Camaro which the previous owner had "upgraded" with a 4bbl Holley. It 
backfired thru the carb. I had never had a car with a Holley because I was 
poor! I didn't know anything about them. I used the car '73 thru '79 as my 
daily driver. I just suffered with the backfiring. Once I got a company car 
the Camaro became a Sunday car. As the years went by I read more and got 
more experience. I decided to get the car to run better. I checked a few 
things and guess what - the distributor was hooked up to ported vacuum. I 
changed it to manifold vacuum and it no longer backfired!
As far as I'm concerned this means that the distributor should be hooked to 
manifold vacuum.
All Tony has to do is move a hose two inches to the other port. Why should 
we continue to discuss ported vs. manifold when Tony can do a short test and 
report the results?
Tony can you oblige?

           Ed

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