As the COVID-19 pandemic brought the regular routines of work and travel to a screeching halt, many car enthusiasts found extra time to work on their custom projects. That has certainly been the case for our friend, Larry Mazzola of Long Island, New York. Larry owns his own shop, ProWorx Performance (Instagram account), specializing in auto repair and custom upgrades for older cars, but has recently found time to make some great progress on rebuilding his 1969 Chevelle. We had the chance to catch up with him over the phone and hear about his experience converting this classic from a carburetor to the Holley Sniper Stealth 4150 EFI system.
Larry came to EFI System Pro wanting to take advantage of EFI technology while keeping a stock look as much as possible. This has been his goal for the car since he bought it from his uncle 10 years ago. Since then, he has rebuilt the factory 396 big-block, added a 5-speed transmission, and run a few different carburetors including a custom-built race carburetor that was pretty well dialed in. That being the case, Larry knew there was still more opportunity on the table with electronic fuel injection. With these goals in mind, we advised Larry to go with the Holley Sniper Stealth 4150 EFI system. In addition to the EFI system, Larry also picked up an OE-Style fuel tank module, a HyperSpark distributor, a set of Holley gauges for fuel pressure, oil pressure, voltage, and coolant. He also picked up a Sniper EFI Throttle Lever Extension to ensure a smooth throttle response.
“I went with EFI, because I like the technology, the ability to laptop tune it or to just tune it with the handheld display. I liked the simplicity of it. You don’t have to wait for the choke to kick on, you just turn the key and it starts.”
“I’m very OCD. The car is far from stock, but it looks stock. I installed the control box in place of the original washer tank mount. I hid the EFI wires by running them along one of the existing wiring harnesses. For the fuel line I took the fuel pump rod out but left the original fuel pump in place with the original steel fuel line to the carburetor location. Chris gave me some great information on this and helped me avoid what might have been a problem with turbulence. I used the original distribution block but actually drilled through it and ran stainless steel lines through it.”
Larry has been very pleased with the Holley HyperSpark distributor as well! “What a genius idea that is. The technology is great. I would definitely tell anybody, you can keep the stock appearance, why not use the technology if it is there?
Installation Pictures:
Original fuel lines customized to work with the Sniper Stealth Throttle Body
New Holley gauges and a custom-built mount for the LED handheld display.
How would you describe the installation process, Larry? “It was probably one of the easiest things I’ve done. It’s really amazing how easy it is.”
What benefits have you seen so far from the system? “Better power, a lot more responsiveness, better drivability, the system is constantly correcting itself. Even with the system not being fully learned I am feeling more performance than the race carburetor.”
We are glad to hear of the success Larry has had with his Holley Sniper Stealth EFI System and are glad to have been along for the ride from choosing the right system and all the way through the installation.
Check out these great pictures of Larry’s ’69 Chevelle taken by his son out at Pilgrim State, an abandoned psychiatric center on Long Island!
Nice ride though I am just a little prejudice having a 68 myself.
I have followed much the same path, 396, Sniper, Tremic five speed.
It turns a lot of heads and is a lot of fun to drive.
The Ordering process was so easy and non-painful. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! I strongly recommend EFI System Pro.
Posted 03/13/2020
Chucks Garage
They are the only ones got me a holley usb to can cable fast. Everyone else was backordered several months.
Posted 05/16/2022
William Harden
I did not buy my holley sniper from EFI Pro Systems. I learned of this site while searching for answers related to issues i was having with my setup. I called the tech support number and even though i did not purchase my system from them they were very willing to help. I had actually called to inquire as to which upgrade card i needed for
Posted 08/21/2020
Bernard
Like many others, EFI System Pro allowed me to dial a new Holley Sniper. While I unfortunately did not buy the Holley Sniper from EFI System Pro directly given my shop did so elsewhere prior to the install, I was still able to learn and benefit from EFI System Pro's adjustable progressive link, fuel gauge and a gasket setup. Most import
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1 Comment(s)
Nice ride though I am just a little prejudice having a 68 myself. I have followed much the same path, 396, Sniper, Tremic five speed. It turns a lot of heads and is a lot of fun to drive.
Sounds nice--thanks for posting!
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