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 !

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⚡ Unlock peak ignition timing — because your engine deserves precision.

SECURE ADJUSTMENT - Built-in stop prevents screw from backing out, ensuring your settings stay locked in under all conditions.
PRECISION ENGINEERING - Smooth-edged, precision-stamped weights and centerplates eliminate erratic timing for consistent power delivery.
OPTIMIZED RPM PERFORMANCE - Recurve your distributor to achieve full spark advance exactly when your engine demands it.
CUSTOMIZABLE SPARK ADVANCE - Three spring sets let you dial in the perfect RPM curve for peak engine performance.
PLUG AND PLAY INSTALLATION - Comes with complete, easy-to-follow instructions for a hassle-free upgrade to your GM HEI distributor.

The Moroso 72300 Advance Curve Kit is a precision-engineered upgrade for GM HEI distributors, featuring three adjustable advance springs, smooth-edged stamped weights, and a built-in stop screw to prevent adjustment drift. Designed to optimize spark advance timing at the ideal RPM, it ensures consistent, reliable engine performance with easy installation.

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Manufacturer	Moroso
Brand	Moroso
Model	ADVANCE CURVE KIT, GM HEI
Item Weight	1.69 ounces
Item model number	72300
Is Discontinued By Manufacturer	No
Exterior	Plated
Manufacturer Part Number	72300
OEM Part Number	72300

Moroso 72300 Advance Curve Kit, Fits GM HEI Distributors

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