Hey guys,

you may or may not remember that i was in the process of installing a pro-jection fuel-injection system when i last posted.

well, that went fairly well and the results were impressive. now comes the bad news, looks as if ive got cracked rings on #6 and #7, probably happened when i fired it up after sitting for 3 1/2 years..

So now i am planning with a friend to build a mild 390 and here is my question for the Guru's: Do you think the 670 CFM Throttle body will be adequate for a 390 that we hope to make 350 - 400 HP?

any and all help is appreciated! thanks

Joe

 

350 is a yes, 400 is a weak maybe IMHO. You will probably be pulling vacuum at higher RPMs.

 

Shoot for a low RPM torque monster, and I think you'd be OK. Just try to keep away from parts that are designed to make power over ~5500 RPM.

Should make for smooth, torquey FE, that starts easy and get's almost decent mileage.

I thought about the Projection for my motor, but wimped out and stayed with a carb..With my cold start issues, I'm thinking fuel injection looks pretty good..

 

the projection setup really did work out well on my stock 352, even on the 2bbl original intake..

the problem i ran into was that through a bad transaction on ebay, it wound up being a costly venture.. i had to buy the fuel pump, and some other things

and still had an older analog computer that didnt have the 02 sensor input.. after much tuning it is almost impossible to get it running consistently smooth, my feelings are though that a newer digital computer with O2 sensor input would have performed much better..

i did get 12mpg on the highway pulling my boat though, given the opportunity to do it over again i would have bought a new setup right from jegs..

there are some pics in my gallery

 

With an air cleaner on you can barely see a difference between it and a carb. I love carbs. That's just me but I do see the advantages of injection.

 

Heck I like carbs so much....I have two of them on most of my cars/trucks...

Fuel injection is nice, but seems they can be troublesome at times. Heck it was -5 Sunday morning and the old '67 352 kicked right off without a hitch. Seems a couple friends with new vehicles had trouble with theirs. Something about really cold weather and the computer just not able to adapt to it. Bummer. The old Holley had NO problems with it.

Larry

 

As far as the whole "cost effective" issue goes a carb would be cheaper but on the other hand I suppose it is hard to beat modern technology although I will stick with a carb because I can work on it myself without expensive tools.