Holley 4555 stock jet sizes

[Seattle Sam]

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Go to this page (PDF) and print it out for all kinds of original Holley carb specs.

http://www.holley.com/HiOctn/ProdLine/CarbList.pdf

Lynn

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Can someone help me correspond my List 4557 (1970 L78, LS-6)to this list so I can make sure I have all the right parts?
Thanks for any help..
-Sam

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Just the correct jet sizes? Anything?
Thanks!
-Sam

[Keith Tedford]

I don't know about '70 but our '69 COPO Chevelle came with #68 jets in the primaries and #76 in the secondaries. There was noticeable lean surge at 60 mph.

[Seattle Sam]

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I don't know about '70 but our '69 COPO Chevelle came with #68 jets in the primaries and #76 in the secondaries. There was noticeable lean surge at 60 mph.

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Thanks Keith! Would these be the same jets for the '70 L78 and LS6? Mr70, or anyone?
-Sam

[Mr. T]

Post deleted by Mr. T

[Belair62]

Thats awful lean....a little LT1 takes 70's and 76's...

[@wot]

The 70 L78 Nova came stock with 68 primary and 76 secondary jets in the Holley 4150. This may be a bit lean - check the plugs and size um accordingly,

[Seattle Sam]

Thanks Dean! Surprising that the LT-1 would get bigger primary jets than an LS6 or L72 - go figure!
-Sam

[@wot]

When re-jetting, what combinations have people used with the stock L78? I was thinking about going larger by 2 or 4 sizes.

[TDW]

I have 72 and 76 in mine. Runs great that way.