BG carb selection?

Hi there

Im trying too choose a carb for my truck, and ive narrowed it down to two. the barry grant road demon jr. 525 and the 625. The truck is a 87 chev 1/2 ton 4x4, with a gm crate 350 engine. i changed the stock cam out for a comp cams extreme 4x4 X4250H stick which has 206 and 214 @.50 and a lift of .432 and .453 . I also swapped the heads for some vortecs , and used a edelbrock performer intake manifold, and of course a pair of 1 5/8 hearders. anyone have some input on my combination and these two carbs that might help me choose between the two.

thnx carl


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I think you would be happier with a Q-jet or Holley. Check some of the old posts.

i have no commet on BG carbs until the quality issues are better.

The quality issues are over! Sheesh! Change the record already, Dawg.

Really simple to choose a BG carb. They have a chart that is based on your cam's duration. Look it up on your cam card and choose the cam accordingly.
The most sure fire idiotproof way to do it is, CALL BG CARBS AND TALK TO THE TECHS. They are extremely helpful. I love my Demon carb. Took a while to get it sorted out but you'd swear the engine was fuel injected. HOWEVER, after saying all of that, if I had to do it over again I would go with a Qjet. Just can't beat the fuel mileage you get with those.

thanx for the reply's guys. I think if i do go with the BG ill have to go with a reman carb. atleast i know its been gone through and bugs fixed. seems to be a lotta love for the rochester, im curious if the rochester would have more bottome end torque compared to the bg carb.

The 625 will perform better on that combination over the 525. The 525 is really better suited for engines like the Chevy 305 and Ford 302.

They are better and we are always looking at ways to improve. We have come on here as well as many other sites and admitted to the issues and listed in details what steps were taken to correct them. Are we ever going to have a problem or issue again? Sure we will as that is part of manufacturing but we do care enough to try and correct them as they occur? Have you tried one lately? I know the answer to that so give it a rest. I even sent you a pm awhile back and offered to look at the one you had a problem with and never got a reply so if you have no comment to make then dont.

sorry sent carb back and got my money so no help needed.
did go with a custom AED carb though

Anything but a BG. Get and old AFB before I would buy another BG.

There is a guy that goes by "Shaker455" over on the PY Forums. He's magic with carbs, and custom builds carbs for your specific combo. Extremely good results. Let me know if you're interested. His references and bonafides are impeccable.

I´m not changing my record.

My Speed Demon is fantastic, not one problem.

well i went out and bought the 625 road demon jr. after i got it home i took a good look at it and noticed the rubber oring seals for the tranfer tube were poking out the ends of the tube. i wasnt going to take any chances so i returned it to the store, that was the only 625 they had so i picked up the 525 jr. it was much better. runs really well so far the only complaint is getting the throttle linkage hooked up, going to have to modify the bracket so it sits back a little farther so the holes in the linkage line up with the cable.

Soooooo......let me get this straight. You came on here and asked how to choose a BG carb. You were told about the cam chart. You also had a guy who works at BG suggest a carb and you wound up getting a carb that was NOT recommended by BG. Wow. I just don't get it anymore.

ya i know seems stupid but if you look at the specs on both carbs, theyre actually the same other than jetting. and the one has annular discharge instead of downleg. so if i need to i can just change the jets, no biggie right?

I think the fuel passages in the metering blocks might be different but I might be wrong on that. Good luck with your choice. Let us know if you have any problems.