750 Carb Jetting for Big Block [Archive]

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Philip47

01-06-2002, 04:08 PM

420hp 454cu 750 Holley DP mech secondaries, starting with 71 primary jets, 82 secondary jets,
Too lean or? whats you suggestion of a starting place?

BigGrizzly

01-06-2002, 08:18 PM

On my sock motoe I'm rinning 75primary NS 82 secondaries.

Randy

Philip47

01-07-2002, 05:14 PM

Okay, I just went outside and bumped the primaries to 73's I shouldn't be too lean,

Jamesbon

01-07-2002, 07:28 PM

You may want to contact Nickerson Performance, they specialize in marine carbs. 215 781 1370. Good Luck!

Nate

BigGrizzly

01-07-2002, 10:59 PM

I got a Idea, just call Holley and ask them. Most people over jet anyway. Thre tech guys know this combo. there is a book of applications for merc. Loaned minr out about 9 years ago and havn' seen it since.

Randy

Philip47

01-09-2002, 06:05 PM

after looking up by list# what Holley jets Marine carbs I didn't call them, they were running like 94's in the secondaries.

Went out today and tested and wound up with 73 primary and 84 secondary, clean crisp and strong