Carburetor on H.O. engines

[kustomkyle]

KustomKyle-my 307 olds was rebuilt by the P.O. around 68k miles,bored .40 over,mildly ported heads (which are the economy 7A heads).It still retains the stock (rebuilt)ccc carburetor which is cracked in two places on the air horn!.I moded the secondary side of the carburetor just as i mentioned above and i'm running a dual snorkel air cleaner i rednecked to make look identical to a 442 one.I am also running 2.56 ratio gears and a 2004r.As for performance,since you have .30 pistons already,get a .30 overbore,rebuild the engine,carb (if needed,then modify) and the VIN 9 cam should be good (i'm not intirely sure).The headers may be a problem,running a slightly richer carby will allow better performance with the headers,as the headers will lean the carburetor out.With all the modifications done to my 307,i would say it makes about 200 hp,290 ft.lbs torque,love to get a dyno reading on it to have accurate numbers.With the gears being so high,it really doesnt show much for itself but it is a tad bit better than a stock 307.By adding 373 gears performance will be much better.BTW it probably needs a rebuild when you have 2 dead cylinders!lol
JRM81BU-I really dont know,i think you could like on mid 80s surburbans and silverados,defintely on cars though

I'm actually working on getting an air cleaner off a 442 right now. I was thinking of making one too with two inlets like the VIN Y one but then the A/C stuff and the A.I.R. pump would be in the way. I always wondered why the VIN 9 ones had a shorter inlet on the right side with no ducting. Does the dual inlet air cleaner make much of a difference for performance? I guess an open element would be best but I have to keep all the emissions stuff.

 

[Minion1186]

supposed it gave the engine 20 hp!Mine really works good,i've tested it on hot days in the summer with the engine fully warmed up and it kept the temp 20 degrees cooler,and gave it some more punch when i romped on it.To make one,i used a bench grinder,punch and hammer and pliers.The reason i used these tools was i had to access to air tools at the time,which is probably the easier way to make one of these.Ultimately,getting a stock vin y air cleaner and an air cleaner with a snorkel that looks like the short snorkels on the vin 9 and welding that snorkel to the vin y is the cleanest,more accurate design as apposed to my plastic invention.I had to heat the plastic snorkel piece up with a hair dryer to make it fit the slightly smaller hole.With Open elements,it lets way more air in,but also lets that hot engine bay air into the engine robbing a lot of power.Cold air means performance to an engine,many people run cold air intakes with dual snorkel tubes like mine to benefit from the cold air,so your best bet is a 442 dual snorkel air cleaner,not a edelborck open element.