1958 fuel injection unit

**Bruce B.** · April 27, 2011, 06:41 PM

Re: 1958 fuel injection unit

It appears that a few different FI units were used on 59 250 HP cars.
The units are 7017200, 7017300R or 7017310.
The 7014900 was used on 58 and 59 290 HP cars.

**Ronald R.** · April 28, 2011, 08:06 AM

Re: 1958 fuel injection unit

per the spec guide the 58 250 hp should use the 7014800 but not sur how the sn plays out????

**Bruce B.** · April 28, 2011, 09:14 AM

Re: 1958 fuel injection unit

Ron,
Sorry, my mind was stuck on 1959.
Early 58 uses a 4800 unit but your car should probably use a 4900.
Serial numbers are hard to pin down since it has been stated that they were not put on engines in serial number order. In addition batches of units were set aside for service replacement which also tends to mix up the serial numbers.
Maybe John DeGregory or another FI expert can add some info.

**Ronald R.** · April 28, 2011, 10:25 AM

Re: 1958 fuel injection unit

Ok thanks that makes sense.
RDR

**John D.** · May 3, 2011, 07:49 AM

Re: 1958 fuel injection unit

Ron, I am still recovering from the Spring Carlisle show.
So you have an April 58 low HP car. Right? If so then you need a 7014900 unit. As far as finding a good unit with the proper serial number on the tag I would say that's a tall order.
Background on this unit: The '4900 and '4900R are about the same unit. Only thing is the nozzles and the ID tag. The low HP unit used smaller nozzles. The GM literature may say calibration though.
Remember this. A 4900(R) unit restored in its stock form is not a reliable unit. It must be updated with later parts in the fuel bowl and for sure have a siphon breaker kit.
If I were you I would look for a good looking core whether it be a 4900 or 4900R and then have it restored. The most important thing to look for is high quality castings as the "guts" can be replaced.
They are not cheap to restore as they need boo coo parts to make them reliable as I said before.
You are lucky you have an April 58 car Ron as it if was early then you would have to use left over 57 units like Bruce likes. haha.
Distributor: Only one choice and that's a '915. All of them were made in late 57 so don't be concerned with a proper date. Check the Judging manual for this info also.
As far as what number should be on the tag-the serial number I meant to say well that's too hard for me at the moment. My body is here (less 41 lbs now) but my mind is shot. Too old for the shows. Email me sometime and I will work on it. But once again don't worry about that. Just find a nice unit and get a first class proper ID tag for it and you are in. Good luck, John
P.S. Then of course you need the big buck fuel filter assembly. The repros we used to have are not up to par so I wouldn't use one of those.
Don't forget your FI must be upgraded for wonderful ethanol.

**Ronald R.** · May 3, 2011, 08:22 AM

Re: 1958 fuel injection unit

John
thanks for your help. I might be in trouble as my car is mid March not April I will send you an email. Check out my new car barn! www.granite-ranch.com thanks again
Ronnie

**Bruce B.** · May 3, 2011, 09:48 AM

Re: 1958 fuel injection unit

Ron,
Fantastic ranch.
Your Jack Russels look like one of mine, great companions.
I have attached a picture of my favorite great running 4360 FI unit.
John DeG doesn't like it probably because Jack Roush autographed the air filter...
Bruce B

Attached Files

**Ronald R.** · May 3, 2011, 09:55 AM

Re: 1958 fuel injection unit

Bruce thanks Nice car! I have a 290 HP car and thought they we close to the same. JG sent me in the right direction am not on the hunt!
RDR
PS got 4 of those JRT's

**John D.** · May 4, 2011, 05:52 AM

Re: 1958 fuel injection unit

Originally posted by Bruce Bursten (27670)

Ron,
Fantastic ranch.
Your Jack Russels look like one of mine, great companions.
I have attached a picture of my favorite great running 4360 FI unit.
John DeG doesn't like it probably because Jack Roush autographed the air filter...
Bruce B

Bruce, Looks very nice and you are to be congratulated for driving your 57 with such an early FI unit. To own and drive an early Corvette with a '4360 one must be an FI novice and know what makes it tick. When those cars were new they absolutely screamed even with the '4360. Too bad we lost the worlds greatest 4360 guru and that was Gail Parsons. JD

**Bruce B.** · May 4, 2011, 09:16 AM

Re: 1958 fuel injection unit

John,

Thank you for your kind words.

Unfortunately I never got to know Gail Parsons but from all I have read and the information and innovation he provided it is easier for me to enjoy my 57 4360.

Your wisdom (seroiusly) has taught me a lot about Rochester fuel injection and 2 important lessons; if it runs good leave it alone and read the books and understand how it works.

My sincere thanks,
Bruce B.

**Jim N.** · May 4, 2011, 09:55 AM

Re: 1958 fuel injection unit

Originally posted by John DeGregory (2855)

Ron, I am still recovering from the Spring Carlisle show.
So you have an April 58 low HP car. Right? If so then you need a 7014900 unit. As far as finding a good unit with the proper serial number on the tag I would say that's a tall order.
Background on this unit: The '4900 and '4900R are about the same unit. Only thing is the nozzles and the ID tag. The low HP unit used smaller nozzles. The GM literature may say calibration though.
Remember this. A 4900(R) unit restored in its stock form is not a reliable unit. It must be updated with later parts in the fuel bowl and for sure have a siphon breaker kit.
If I were you I would look for a good looking core whether it be a 4900 or 4900R and then have it restored. The most important thing to look for is high quality castings as the "guts" can be replaced.
They are not cheap to restore as they need boo coo parts to make them reliable as I said before.
You are lucky you have an April 58 car Ron as it if was early then you would have to use left over 57 units like Bruce likes. haha.
Distributor: Only one choice and that's a '915. All of them were made in late 57 so don't be concerned with a proper date. Check the Judging manual for this info also.
As far as what number should be on the tag-the serial number I meant to say well that's too hard for me at the moment. My body is here (less 41 lbs now) but my mind is shot. Too old for the shows. Email me sometime and I will work on it. But once again don't worry about that. Just find a nice unit and get a first class proper ID tag for it and you are in. Good luck, John
P.S. Then of course you need the big buck fuel filter assembly. The repros we used to have are not up to par so I wouldn't use one of those.
Don't forget your FI must be upgraded for wonderful ethanol.

John, my '58 is a very early car-#0152. Would a 4900 or 4900R be correct for it? Jim

**Ronald R.** · May 4, 2011, 10:42 AM

Re: 1958 fuel injection unit

Can I find/buy a replacement 4900 tag??? thanks RDR

**Bruce B.** · May 4, 2011, 11:22 AM

Re: 1958 fuel injection unit

Ron,
John DeGregory has them listed in his catalog.
Phone 724 832-3786 or JohnDeGreg@aol.com

**John D.** · May 5, 2011, 07:02 PM

Re: 1958 fuel injection unit

Hi Jim, I doubt whether your car would take the later style unit.
You didn't ask but your car definitely takes a 906 or 908 distributor dependiong on the horsepower.
I bet your car would use a 4960, a 4800R, etc.
Better ask the team leader Tim Mickey on this one to make sure.
I can tell you there are 58's out there with serial numbers higher than yours with left over 57 FI's. But ask Tim and let us know. Thanks, John

1958 fuel injection unit

1958 fuel injection unit

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment