Best 4bbl

j par said
While I'm a known fan of the Holly Street demon I would say all carbs have to be checked.. tomorrow I'm reinstalling a 750 on a 65 Pontiac 400 and the float bowls that are supposed to be set at one inch one was set at an inch and a half and one was set at a quarter from the factory.. way off... And as far as buying one of those 80 or $90 tune-up kits not a fan either.. first off they give you yet another set of metering rods and jets that are already in the carburetor. And also you're likely going to go one way with it like leaner or richer so just bring a set or two of jets heading in the direction that you need for your particular setup would be much cheaper than an entire tune-up kit with again not only the Jets that you have and metering rods you have with the ones going the opposite way of the way you want to go... I would also recommend a $4.95 Edelbrock Summit brand spring kit as opposed to the demon Springs which are colossally expensive or even the Edelbrock Springs which are way over twice as much as the summit knockoff step up Springs....

Well I don’t know what to say when it comes to the cost of a carb kit that comes with the correct primary and secondary jets, the multitude of metering rods, and all the springs. If a guy wants to spend time and money ordering individual pieces have at it. The 750 kit DOES NOT give you duplicate rods. You get a set of richer and a set of leaner, sane with the primary jets. Pretty sure the 625 kit doesn’t come with a duplicate set of rods either IIRC, just 3 sets leaner and 3 sets richer, along with more primary jets than the 750 kit. First pic is the 750 kit, second the 625:

Best of luck on those Edelbrock springs working, they’re not the same dimensions as those used in the Street Demon. Thought I could use the Edelbrock #7 springs but no go.
The colors and strengths of both are not the same. All I can say is when it came to properly dialing in the light throttle, light acceleration, heavier throttle and WOT I was able to really zero in on each circuit using the kit as I drove and tested. I had a chart I made up of all the rich to lean combos of rods and jets. Knew exactly the combos I needed to fine tune.
The carb is one of the cheapest in cost as it is, and adding in the kit combined is still cheap, gives you all you’ll ever need, and if/when you ever sell the carb the kit goes with it for the next guy that obviously won’t have the same engine.
Buy the carb and kit and be done or buy only what you need, modify something else to fit. Not me. Gimme the kit with the carb.