Is it possible to increase or decrease total mechanical adcance with this?

No. It will only modify when the advance comes in. Softer spring brings it in at lower rpm. Stiff spring; higher rpm. Total timing is unchanged.

Will this fit a OMC 2.5l?

This will fit and large cap gm style hei distributor.

Will this work an a profrom Hei 66941 distributor

I would say yes,, I usually run 2 med springs in my set ups Once installed check for smooth operation, set timing at 10 with heavy springs at idle then switch to the 2 lightest rev it up and see what is available from the new setup of course subtract your initial 10 degrees.. probably you’ll get about 18-22 available I run 14 initial 20 additional from my distributor all in by 2850 rpm and 10 vac advance 400 Pontiac

What are the 4 white parts for and what r they for?

The white bushings are installed onto the pin that the weight is installed on. Early models did not have them and some late models did. There may be different sizes in the kit of which I am not sure of but sometimes the pins will get worn and the bushings come in handy to keep the weights from moving around and affecting the timing curve. Some people do not use them but I will if there is too much play in the hole on the weight. Hope that helps. Also remember that you need to know how much total advance your distributor will have at full advance. Lets says it is 20 degrees and you want a total of 34 at 3000 then you would set your base timing at 14 degrees to get your total. Good Luck !

Moroso 72300 Advance Curve Kit Fits Gm Hei Distributors

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Description

⚡ Unlock peak engine timing — drive smarter, tow stronger!

EASY INSTALLATION - Comes with complete instructions and fits seamlessly on GM HEI distributors.
SECURE ADJUSTMENT - Built-in stop mechanism prevents your timing screw from loosening under vibration.
PRECISION ENGINEERED - Smooth-edged weights and centerplates eliminate erratic timing for consistent performance.
CUSTOMIZABLE SPARK TIMING - Three spring sets let you dial in perfect advance rates for your GM HEI distributor.
ENHANCED TOWING DRIVEABILITY - Optimizes spark advance curve to fix bogging and improve power delivery under load.

The Moroso 72300 Advance Curve Kit is a precision-engineered upgrade for GM HEI distributors, featuring three adjustable advance springs and smooth-edged weights to deliver a finely tuned spark advance curve. Its built-in stop prevents screw backout, ensuring stable timing adjustments. Ideal for improving engine response, towing performance, and overall drivability, this kit is easy to install with included instructions and is a top-rated choice among automotive enthusiasts.

Specifications

ASIN	B000COO1DG
Best Sellers Rank	#57,973 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Replacement Distributor Recurve Kits
Brand	Moroso
Customer Reviews	4.6 4.6 out of 5 stars (344)
Date First Available	February 13, 2005
Exterior	Plated
Is Discontinued By Manufacturer	No
Item Weight	1.69 ounces
Item model number	72300
Manufacturer	Moroso
Manufacturer Part Number	72300
Model	ADVANCE CURVE KIT, GM HEI
OEM Part Number	72300

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