---
product_id: 44032368
title: "Moroso 72300 Advance Curve Kit, Fits GM HEI Distributors"
brand: "moroso"
price: "1289026₫"
currency: VND
in_stock: true
reviews_count: 13
category: "Moroso"
url: https://www.desertcart.vn/products/44032368-moroso-72300-advance-curve-kit-fits-gm-hei-distributors
store_origin: VN
region: Vietnam
---

# Built-in stop prevents screw backout Smooth, precise timing curve 3 adjustable advance springs Moroso 72300 Advance Curve Kit, Fits GM HEI Distributors

**Brand:** moroso
**Price:** 1289026₫
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** Moroso 72300 Advance Curve Kit, Fits GM HEI Distributors by moroso
- **How much does it cost?** 1289026₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/44032368-moroso-72300-advance-curve-kit-fits-gm-hei-distributors)

## Best For

- moroso enthusiasts

## Why This Product

- Trusted moroso brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **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.

## Overview

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.

## Description

ADVANCE CURVE KIT, GM HEI

Review: Just what I needed - Removed the old springs and weights and installed this set. Installation is as super easy. I ended up needing the black springs as the 454 kept knocking with medium springs. Perfect replacement for the old.
Review: Made my truck drive like a new vehicle - I had installed an aftermarket HEI which had a horrible timing curve. Using this recurve setup i was able to use one light and one medium spring to bring in all my timing by around 3200rpm. The timing advance starts around 1100rpm and comes up perfectly smoothly through the RPM range. This fixed a part throttle bog I had when towing heavy trailers with my truck and generally increased my towing experience. No directions are included, but if you google Moroso 72300 you'll find the instructions which show the different spring characteristics. I would 100% recommend installing these.

## Features

- Recurve your distributor for full spark advance at the optimum RPM
- Three sets of advance springs allow you to adjust the rate of spark advance
- Built-in stop prevents the adjustment screw from "backing out" like other designs
- Weights and centerplates precision stamped with smooth edges eliminate erratic timing
- Comes with complete installation instructions

## Technical Specifications

| Specification | Value |
|---------------|-------|
| 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 |

## Images

![Moroso 72300 Advance Curve Kit, Fits GM HEI Distributors - Image 1](https://m.media-amazon.com/images/I/51ODz6GPmYL.jpg)

## Questions & Answers

**Q: Is it possible to increase or decrease total mechanical adcance with this?**
A: 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.

**Q: Will this fit a OMC 2.5l?**
A: This will fit and large cap gm style hei distributor.

**Q: Will this work an a profrom Hei 66941 distributor**
A: 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

**Q: What are the 4 white parts for and what r they for?**
A: 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 !

## Customer Reviews

### ⭐⭐⭐⭐⭐ Just what I needed
*by L***N on October 6, 2025*

Removed the old springs and weights and installed this set. Installation is as super easy. I ended up needing the black springs as the 454 kept knocking with medium springs. Perfect replacement for the old.

### ⭐⭐⭐⭐⭐ Made my truck drive like a new vehicle
*by R***T on June 10, 2023*

I had installed an aftermarket HEI which had a horrible timing curve. Using this recurve setup i was able to use one light and one medium spring to bring in all my timing by around 3200rpm. The timing advance starts around 1100rpm and comes up perfectly smoothly through the RPM range. This fixed a part throttle bog I had when towing heavy trailers with my truck and generally increased my towing experience. No directions are included, but if you google Moroso 72300 you'll find the instructions which show the different spring characteristics. I would 100% recommend installing these.

### ⭐⭐⭐⭐⭐ Nice advance kit for the price!
*by A***R on February 10, 2026*

I was having a hard time nailing down my initial timing because it was jumping all over the place. This kit fixed that. However, I’m only getting 16 degrees of mechanical advance with this kit in my HEI. I have a big cam so my initial is at 16 as well giving me 32. Runs hard but I’m also safe from detonation. I’ll need to carefully shave the weights or center plate to get more. I’m satisfied for now.

## Frequently Bought Together

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-05-19*