I have an 81 Ranger F-150 with a 302. The stock 2 barrel carb wore out around the throttle plate shaft. The cheapest rebuilt carb ive seen so far to replace the stock was 250. Someone is giving me a spare quadrajet carb from a 454 boat engine then had. Ive already found adapters for the manifold and all (and a new manifold). So the question i ask is, does anyone have any recommended settings for the jets and metering rods from doing a similar conversion or would someone happen to know the jetting for a 305 engine? Any and all help is appreciated.
Thanks.

 

Not really- a carb from a 454 would have way too many CFM for a little 302 (825-850 cfm). I would be for a reman 600cfm edelbrock carb from summit. you are looking at about $175 or so. I believe you have to get a new intake either way you go (either from a junkyard or new) which will probably cost you at least $50-175. but I think your most cost effective solution would be to look around for a new two barrel carb.

 

Actually, the 454 carb would be around a 750 cfm total carb. Since the design has vacuum secondary's it will only flow as much as the motor needs. There were two designs, with an 800cfm being the largest and it was only equipped on Caddy's 472/500, Buick/Pontiac's 455, and the later GM 70's 3/4 ton 454 pickups.

The main thing is the carb won't be too big venturi-wise, it will just be jetted richer than needed. One way to solve that is to determine what the jetting was on qjet's on 305s and 327 and jet the carb you have similar to those calibrations both jets, rods, and hanger.

These in my opinion are the most advanced and misunderstood carbs of all time. They allow good part throttle mileage with the small primary's and also really flow at WOT due to the very large secondary's. Its just that they aren't anything like a holley and take alot of adjusting to get them right, but once you do they stay that way and are a great mileage/performance carb. The only thing holley ever really had on the qjet is that they didn't have to meet emission requirements and the like on new vehicles. The qjet is able to do just that and more...if you are willing to spend the time to dial it in correctly.

Kerry

 

i built a 425 hp stroker 350 for my 81 Z-28 4spd and went with the 750 qjet . i found that the factory settings were fine the way they were. the jets are factory capped and should`nt need setting.
though i would suggest maybe going w\ a heavy`er cam , even an rv cam and a dual plane intake if you have an automatic or a single plane intake if you have a standard tranny , the intake will allow a better fuel\air mixture at higher rpms

 

ok, so as i asked, would anyone happen to know the jetting some of the small block chevys?