Need help on Holley jet sizes!!! - Team Camaro Tech
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post #1 of 3 (permalink) Old Dec 14th, 00, 02:56 PM Thread Starter
Join Date: Jun 2000
Location: USA
Posts: 9

I have a Holley 4778-4. It was running rich so I have taken the bowls off to rejet.

It has 78s in the front and 69s in the secondaries...

Isn't that backwards??

This carb was a one owner (he didn't like it) and almost brand new.

I am at 4,500 ft above sea level

What should have this carb had stock??


All help appreciated.


Mr. D
1968 RS SS Camaro
1973 RS LT Z28 Camaro
1972 454 Elcamino
1999 Firebird T/A WS-6
1995 Chevy Caprice LT1
1976 Jaguar XJ12L Chevy converted . . . for sale.
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post #2 of 3 (permalink) Old Dec 14th, 00, 03:02 PM
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Join Date: Sep 2000
Location: Washington, Michigan USA
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Tim -

If you'll go to the Holley website (, their tech section will show you EXACTLY the way your carb was originally built. You'll probably find it more like 68's in the primaries and 74-76's in the secondaries. At 4500 feet, you'll want to jet down 2 to 4 numbers.

'69 Z28 Fathom Green
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post #3 of 3 (permalink) Old Dec 14th, 00, 03:42 PM Thread Starter
Join Date: Jun 2000
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Thumbs up

That was GREAT!!! It had just the info I needed. They WERE backwards!!!

I wonder if it came that way from the factory.

The guy I bought it from said it was WAY too big for his motor. If only he knew what I now know!! He would probably still have it on his car.

Thanks again.

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