View Full Version : Carb Wizard Needed

07-30-2012, 08:25 PM
Rebuilding 4160 off 1983 351 PS S&S. Jets marked 299. Holly jets typically marked with two digit #. Anyone know anything about these?

07-31-2012, 12:11 AM
Found this while searching the net.


The jets in my 4160 are #66. The carb is from an '88 Prostar 190. I would guess someone rebuilt the carb at some point and put those in. I would replace them with the correct jets...........but that might be my MC-OCD acting up. How was it running? What did your plugs look like?

07-31-2012, 12:29 AM
From what I understand, those jets were used in the Holley (Webber style) 5200 series carbs, and not in a 4160. The 299 was cc's of fuel at 50" water, and was equivalent to around a 56 or 57 regular jet. Do they have a green tint? I thought the thread size was different, and wouldn't fit in a 4160, but I must be wrong. Looks like someone's been there before, unless my info is off.

Matt L.
07-31-2012, 01:43 AM

There all fixed!


07-31-2012, 07:58 AM

There all fixed!


Do you mean buy a carb?
If so what model? (tempted to do it this winter to avoid the typical holley issues and resulting rebuilding issues....(my boat guy recommended it too!)


07-31-2012, 08:26 AM
Skip the Edelbrock.

Cant help you on decoding the strange stamping on the jets- I concur with MrMC, the stock jet size on the 600cfm 4160's Ive taken apart has been ~66. Are these the jets that you removed from the carb? How did it run? Do you have the ability to measure the size of the orifice?

07-31-2012, 12:37 PM
Where in Wisconsin are you. Excellent Holley carb guy in Oconomowoc

07-31-2012, 12:45 PM
Pls send me his name/number via private message or post.

[email protected]

08-01-2012, 11:54 PM
Thanks for all the responses. Runs well. Carb torn down due to leak from a pressed plug. Yes is obvious someone has been in there before. Will guage drill size of jets and report back. Good to know that 66 is most common. Plugs are clean and boat is nimble and responsive. Boat was in storage for 15 years so is low hours but had non-use issues, ( rotten hoses, stuck valve in trans, old gas, old oil, corrosion, wiring etc.) All better now... Thanks

08-02-2012, 10:23 AM
Glad to hear things are under control.