well its getting near that time to spend some more money on my motor and i think my next buy will be the carb. what is everyones suggestion on what i should run? i have been looking at the Edelbrock Thunder Series 650cfm manual choke

here's the engine so far:
79 400
Bored .030 over
stock reman crank
stock pistons w/ moly rings
Edelbrock 2172 cam
Edelbrock 2171 intake
stock reman heads with Edelbrock SureSeat springs
Edelbrock pushrods
ProComp HEI distrubutor
new water and oil pumps


so would the Thunder series be well suited or maybe something else?
i would like to run an edelbrock carb unless there is something bad i dont know about them.

thanks

 

I think that a 650 would be slightly over sized for your application, but it would probably be okay.

Is there any reason you are looking at an AFB instead of a Holley? I have never had an Edelbrock carb, but I have spent LOTS of time in the past messing with Carter AFB's and AVS's which are the same thing.

There are things that I like about a Carter, but what I dislike is the vacuum actuated pistons that serve as the richening device. The problem with them is that the pistons and bores wear out. On the plus side, the AFB's are not prone to leaking after a few years resulting in the necessity for an overhaul like the Holleys.

After living through the carburetor days of the sixties and seventies and beyond, and rebuilding and messing with LOTS of carburetors, I prefer the Holley for it's tunability, but I guess some of it has to do with what you have spent the most time with.

Given that my truck is not a daily driver, I have even considered going to an AFB with the thinking being that I won't drive it enough to wear out the pistons and bores and maybe I won't have to rebuild it so often due to setting up and developing leaks.

BTW, I have not checked into this, but the CFM ratings MIGHT be different between the two makers. The CFM ratings would vary if they are tested at different vacuum levels.

Good luck,

 

Difference in cfm comes 2brl to 4brl. Measured at different inches of mercury I think. I like the holley for tunability, but the e-brock is good for slap it on and go. Unless a 400 is built pretty good, a 600cfm is enough.

 

I just finished putting a 625cfm Road Demon on my truck and after I got some noncarb related problems fixed it runs great, think i might want to play around with secondary springs a little but thats all. Set it up when it was 85 degrees out and I just drove home from work and it was 48 and it fired right up and drove good I am fairly impressed I thought I would have to fine tune it more after it cooled off. I am pretty sure you will have to run at leaste aabout a 1" spacer to clear the dual feed fule line that is included with the carb.
-Johnboy