Speedway Motors Piston Ring End Gap Squaring Tool, 4.000 to 4.230 Bores

Accurate Ring Positioning – Provides the most reliable way to square piston rings in the cylinder bore for precise end-gap measurement, improving overall engine setup consistency., Dual-Diameter Design – Features two machined sizing steps, allowing one tool to service 4.000" through 4.230" bore diameters simply by flipping it over., Durable 6061-T6 Aluminum – Made from high-strength anodized aluminum for long service life, smooth operation, and resistance to shop wear., Works with Head Studs Installed – Outer diameter is engineered to clear installed cylinder head studs, eliminating the need to remove hardware during measurement., Open-Center Configuration – Hollow center lets you visually confirm the ring is fully seated and square in the bore, making it more accurate and easier to use th Piston Ring Squaring Tool, 4.000 to 4.230 Bores Sku # 91089415 Mfr. Part # 91089415 Condition New Brand Speedway Motors Sold Each Details

• Squares your piston rings in the cylinder bore for file fit measurements
• Fast and easy way to ensure your rings are square in the bore before measuring
• More precise and easier to use than using a piston to square your rings in the bore
• Dual sided tool made from 6061-T6 anodized aluminum for long service life
• Suitable for bore diameters from 4.000” to 4.230” depending on side of tool used
• Piston ring tool can be used with cylinder head studs installed

Proper Ring Gap Is Critical to Engine Performance; Our Ring Squaring Tool Makes the Job Easy

Building an engine, no matter if it is a low-buck cruiser or a high-end race engine, ensuring your piston ring gap is measured and adjusted for the performance expectations of that engine is vital. Piston ring end gap must be measured in the cylinder bore of the engine the rings are being installed into. It has been common in the past for many an engine builder to simply grab a piston and use it to push the piston ring down into the bore. While this may have worked, there is little to guarantee that the piston ring is truly square in the bore for a precise piston ring end gap measurement. Like any job, using the proper tool to get the job done will save time and provide more accurate results. This is why a piston ring squaring tool should be a part of your engine building tools collection.

Our piston ring squaring tool is made from durable 6061-T6 aluminum and is anodized for good looks and lasting protection. We designed our piston ring tool to work with a cylinder bore of 4.000” diameter up to 4.230” diameter by providing two different bore sizes in one tool. Simply flip the tool over to use applicable fitment for your engine block. For smaller bore engines, such as the popular LS, we offer a Piston Ring Squaring Tool For 3.736" to 3.810" Bores sized to work with 3.736” to 3.810” cylinder bores. The piston ring squaring tool provides the user the ability to seat the piston ring tool quickly and easily to the block surface to position the piston ring in the cylinder’s bore. The open center of the piston ring tool allows the user to reach into the bore and pull the piston ring up against the piston ring squaring tool, confirming that the ring is indeed square in the bore for measuring with a feeler gauge.

The outer diameter of the piston ring squaring tool allows for use on blocks with head studs in place/installed as well, saving you further time of having to remove your studs to check and set piston ring end gap. Note that this piston ring tool is only designed for squaring your piston rings in the cylinder bore and is not a piston ring compressor. We offer Shop Piston Ring Compressors in six different size ranges to safely compress your piston rings and aid in installing your piston and rod assemblies.

Specs Inside Diameter 3.75" Outside Diameter 4.25" Sold in Quantity Each MFG. Part # 91089415 Reviews Works perfectly Rated by DoubleJ on November 14, 2023

Summary: Works perfectly to square rings in the bore

Yes, I recommend this product.

Worked great Rated by Big Krugs on August 02, 2021

Summary: Good quality craftsmanship

Yes, I recommend this product.

great little tool Rated by Nick on March 11, 2021

Summary: I wish you had one for a small bore cylinder 3.875 to 4.0 at the same price.

Yes, I recommend this product.

Works well Rated by BM on April 14, 2020

Summary: Beats using a piston

Yes, I recommend this product.

I would buy this again Rated by Tb on March 31, 2020

Summary: Worked great

Yes, I recommend this product.

Related Items / Suggested Parts Piston Ring Filing Complete Tool Kit Small Block Chevy Engine Assembly Basic Tool Kit Tech Support We're here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through eBay Messaging and a knowledgeable Speedway Motors team member will be happy to help. About Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 74 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.