Any of you guys ever done a carb swap on a 318 magnum. Summit has the intakes for it, and i have the carb, i am getting a long block and dont have the money for the pcm or fuel injected manifold. thanks.

 

Never done it but it'd be easy. Oil presure you can unscrew the factory electrical sensor (I think), water temp would be easy.

 

what about the distributor? would one from an LA work?

 

you'll also need a new fuel system. running a carb takes significantly less fuel pressurethan a fuel injected setup. in most people's eyes switching to a carb is alot of unnecessary expense and hassle. you'll likely need to switch all your gauges to aftermarket versions as well, because they are PCM controlled and you'll need to eliminate PCM control in your setup. same goes for transmission, if it's electronic controlled at all, you're likely going to have problems.


unless it's an all-out drag only buildup where you don't care about driveability or having working equipment, stick with the fuel injection.

 

yea, i was going to run a fuel pressure regulator, cuz with an edelbrock performer you are only supposed to run 6 psi... and i have a tach. and i can get a cable for my speedo out of and older dakota, so it wont be too bad...

 

trans could be a little tricky if its an auto, the shift points arnt pcm controlled however the OD solenoidand TC lock up are

 

By the time you got it down to 6 psi, you would barely have enough fuel flow for idle.

To do this swap, you will have to:

-install an old 5 wire ECU and dist., or an aftermarket dist.
-get a 727 or 518 transmission + linkage
-swap out all gauges
-install older externally regulated or GM 1-wire alternator
-re-wire brake switch and MFS
-remove in-tank fuel pump and install in-line electric unit.

There will be other sundries, too.

This is a feasible conversion for the old throttle body LA blocks, but definitely not worth it on amagnum. Both fuel economy and performance will suffer greatly.

 

Or just put a 5 speed in...


On my Jeep I put a reg on my factory fuel injected pump. Its a return style reg from Mallory...its never given me a problem, never studers, or acts like its being starved for gas. Its a carb'd 350 btw.