Here's the deal I've always been a kid of EFI. Although I have dabbled with carbs a bit. Regardless....I have a Mav with a mild 308 and it seems that over 4k it wants to break up really bad. Almost like it's running out of gas. This car is a 250 I6 to V8 conversion. Here's the specs and the question. Is it possible that the I6 fuel lines can't handle the new motor? 308-302 bored .040 Crower .500 cam Original Torker 289 intake Eddy 170 cc Perf RPM Heads 2.02/1.60 valves LT Hooker 6901 Headers Holley 750 carb Stock Mech fuel pump Electric Fan on thermo control C4 with shift kit 300 rear gear Scorpion 1.6:1 roller rockers Crane XRi Points conversion kit Thanks guys for the input!
i would check teh eletroinc conversion. make sure nothing is loose in the distrbtor. a 750 is too big for you motor but it wouldnt cause the problem you have. it could be a phaseing problem in the distrbtor also.
Stock 6 fuel lines are the same as the v8, my car with the 347 runs just fine with stock lines, I would suspect a plugged fuel filter, filter in the carb or restriction from tank (plugged sock) or floats in carb set wrong. Might try pulling fuel line off of the fuel pump and turning engine over (unhook coil wire so it wont start) and see how much fuel it will put in a container for amount of time it is cranked. Always be careful when playing with fuel Good luck
Good info! Thanks guys! That's good to know that the fuel lines will support a 347! My next build for the car is a Boss 347!
It cant hurt to upgrade the lines though but you are restricted at the tank by the tube coming out of the sending unit I do believe maybe not an issue. Boss 347 yee haw
Had to change the fuel pump on my 302 for the same thing. Ran out of gas at upper rpm's. I got a Summit 80gph pump, and have had no problems since. Btw, using the stock 6cyl fuel lines, work good!
