Recent content by mr348-409

Been trying to fix the carb backfire problem some more, lots of things tried but no fix I was able to make the motor do it when I give it the gas, when I use the accelerator pedal, but it would not do it when pulling the carbs open by hand under the hood both as fast as I could Hmm? Then I...

6al ign plug gap 35, primary power valve 45,primary pump nozzle size 33, primary main jet 76, sec jet 84 booster downleg

will check the size on the squiters on the 850s

The backfire is like a huge bog when you just step on the motor when you bring it up on the 3 step or it even hesitates real bad when you just open the throttle with no load

run the timing locked at 37degrees

The car has dual quick 850s on it now have tried 650 750 and800 edelbrocks over the years ,different intakes higher stall motor has this bog and backfire just bringing it up on the 2 step unless I have it running at 1800 rpm at idle and leave then at 5500 then it will go Even changed the cam...

Has anyone used Shear Plates under the carburetor to help with the bog and backfire problem that comes with a tunnel ram type intake? Any ideas or input is appreciated. Thanks.

Good to see you made it home. Lets see a 409 mocked-up in the car That is cool and the only way to go! Ralph

James , I built the 1964 gmc you saw at the show probably 20 years ago Ralph

Posting this on the forum to let anyone know that in my dealings with carl , that he has been above and beyond excellent on warranting his parts. A big THANK YOU to carl from MR 348 409 I highly recomend any 409 guy to give him a call. Ralph

James are they straight down or angled?

James what are the size of the holes on the upper side of the piston? Also what is the size and number of holes on the underside? Had a great time at your place saturday Thanks Ralph

Indy would be great count me in 1/2 the distance for us

Are the black wheels gloss or semi or flat?

The coil I am running is a msd blaster which I changed once ,On leaving at a higher rpm ,my car struggles to not stumble when I just bring it up on the two step, So footbraking is terrible at most any rpm. It has even backfired hard enough to shoot flames out the top of the carbs