correct FI for 57 corvette

[Mike C.]

Hi Guys
Can anyone tell me what is the correct FI unit for a 4th week of May 57 corvette 283/283 with 4 speed
Thanks
Mike

[Daniel J.]

Re: correct FI for 57 corvette

assuming VIN 4100 ~ 4216 with engine code "EL"...FI model should be # 7014520 / serial # between 2100~2300

[Rick G.]

Re: correct FI for 57 corvette

Hi Mike,

If you don't already have it, I would suggest you purchase Noland Adam's "The Complete Corvette Restoration and Technical Guide Vol 1". It has a wealth of information I know you will find useful including surveys of original cars. It is readily available from the NCRS store.
Best regards,
Rick

[Jimmy B.]

Re: correct FI for 57 corvette

Contact Brian Futo to get his 2 cents. Run a 905 distr. not a 908 or 889.

[John D.]

Re: correct FI for 57 corvette

Mike, 4th week of May is pretty much cut and dry. As Daniel Johnson mentioned you need a 4520. Maybe Gary Chestnut will chirp in on this.
The latest 57 judging manual spells this out also. At least it spells out '4520 but not the different versiona of the unit. Trying to find one with a serial number to suit your car is a very tall order today.
'4520's are definitely drying up. The passenger car guys really put a dent in them. And not too many 57 Corvettes are left with carbs on either you know. LOL
The first fuel injection unit I ever owned in my life came from a May 57 Low HP car owned by Dick Compton formerly of Jeannette, PA. It was a '4520.
As mentioned you need a 905 distributor. Fuel filter would have square bosses where the fittings go.
If I had a quarter for every guy that asked for one at Spring and Fall Carlisle for his 57 steel Chevy I would be loaded right now. Good luck, John

[Mike C.]

Re: correct FI for 57 corvette

Hi Guys
I'm very sorry I lied I was given the wrong info the VIN is 4878 which makes it an end of June car
Mike

[Daniel J.]

Re: correct FI for 57 corvette

Mike:
I just sent you an email.
Dan

[Mike C.]

Re: correct FI for 57 corvette

Dan
I didn't get your email
Mike

[Daniel J.]

Re: correct FI for 57 corvette

Mike:
pm sent.
Dan

[John D.]

Re: correct FI for 57 corvette

Hi Guys
I'm very sorry I lied I was given the wrong info the VIN is 4878 which makes it an end of June car
Mike

Mike, I don't have the latest 57 JM that I really need to get. I have no idea that it says for your car.
In Ken Kaysers book, "The History of GM's Ramjet Fuel Injection "etc
look on page 373.
"On Wednsday June 12th, 1957 Rochester Products issued Part Number 7014960............" When it actually was installed on a June car I do not know. I do know that the '4520 FI unit was used in production much later than we typically thought for many years. But where the cut off date is I do not know. See your team leader and the manual. JD

[Tom P.]

Re: correct FI for 57 corvette

According to Ken Kayser, which I was not aware of before reading the information in his book, the 4520 was used for BOTH 250 and 283hp engines. The ONLY difference was calibration and the serial number on the plenum tag, 1XXX for 250hp engines and 2XXX for 283hp engines.
I've always liked, and been partial to, the 4520 units. Of course, the 4800 and 4960 are a little more "user friendly".