I'm thinking of trying a edelbrock 600cfm on my 13b, after reading through far too many threads it seems that only one person has tried the thunder series, or the others didnt mention it in their posts.

what im trying to figure out here is how vital it would be to have the thunder series with the Qwick Tune secondary air valve for tuning the secondaries with the turn of a screw.

the performer is far cheaper so im swayed to go that way. has anyone tried one of these on a stockport 13b? pro's/con's?

 

I'm trying to figure out the same thing. Also looking at a Demon Carb.

 

I think the initial expense of the thunder series pays off very quickly with the short time it takes to tune the carb

and yes mine is still for sale