Business Details
50+ Years
experience
Expert Automotive & Diesel Engine Machining Services
M & R Machine Shop has served the automotive and diesel engine industry since 1949, establishing itself as a trusted name in precision machining and engine performance. Our team combines decades of hands-on expertise with state-of-the-art equipment to deliver solutions for OEM stock engines, competition racing engines, and heavy-duty diesel applications. Owner Jason Myers, with nearly 25 years of experience as an automotive machinist and engine builder, leads our commitment to excellence. Since relocating to our current facility in Greencastle, Indiana, in 2012, we have continuously expanded our capabilities to better meet customer needs.Our services span cylinder head rebuilding, block blueprinting, crankshaft balancing, and custom welding, catering to automotive, agricultural, industrial, and marine sectors. We prioritize precision and quality in every project, from individual part refurbishment to full engine assembly. Our dedication to innovation and customer satisfaction has driven sustained growth over generations. By maintaining transparency and technical mastery, we ensure clients receive reliable, high-performance results tailored to their specific requirements.
Services
Cylinder Head Rebuilding
Engine Assembly
Crankshaft Balancing
Block Blueprinting
Custom Aluminum Welding
Details
- Year established: 1949
Highlights and features
- We have over 70 years of experience in automotive and diesel engine machining.
- Our owner has nearly 25 years of specialized expertise in engine building.
- We utilize advanced equipment for precision cylinder head and block work.
- We serve diverse sectors including racing, agriculture, and marine industries.
- Our team relocated to a modern facility in 2012 to enhance service capabilities.
Services
Cylinder Head Rebuilding
We specialize in restoring cylinder heads to OEM specifications through multi-angle valve jobs, porting, polishing, and guide honing. Our thermal cleaning system removes carbon buildup while preserving structural integrity. This service enhances engine performance for automotive, racing, and industrial applications.
Engine Assembly
From stock replacements to high-performance racing engines, we assemble precision-tuned systems using blueprinting techniques. Our process includes line honing, block preparation, and torque plate honing to ensure optimal alignment and durability for diesel and gasoline engines.
Crankshaft Balancing
Our computerized balancing ensures smooth engine operation by correcting weight distribution in crankshafts. This service includes grinding and polishing to restore worn journals, critical for maintaining performance in competition and heavy-duty diesel engines.
Block Blueprinting
We perform precision boring, honing, and milling to return engine blocks to exact factory tolerances. This includes two-stroke cylinder work and pressure testing to identify cracks, ensuring reliability for racing and industrial applications.
Custom Aluminum Welding
Our welding services repair or modify aluminum components like intake manifolds and custom parts. Using advanced techniques, we maintain material strength while creating durable, precision-fitted solutions for automotive and racing clients.
People
Jason Myers
Owner
Jason Myers has worked as an automotive machinist and engine builder for nearly 25 years. He co-owns M & R Machine Shop with his wife Gloria, overseeing technical operations and quality control since their 2003 acquisition.
Questions
What types of engines do you specialize in?
We specialize in OEM stock engines, competition racing engines, heavy-duty diesel engines, and performance diesel applications for automotive, agricultural, industrial, and marine sectors.
Do you handle both repair and customization?
Yes, we offer full-service repair, refurbishment, and customization including racing engine builds, block blueprinting, and custom aluminum welding.
How long have you been in business?
M & R Machine Shop has been serving customers since 1949, with current owner Jason Myers bringing 25 years of specialized engine-building expertise.
What are your operating hours?
We operate Monday through Friday from 8:00 AM to 4:30 PM and are closed on weekends.
Where are you located?
Our facility is located at 406 Maple Ave, Greencastle, IN 46135, USA, serving local and regional clients.
Can you handle racing engine requirements?
Yes, we specialize in competition racing engines with services like multi-angle valve jobs, porting, and precision balancing for high-performance applications.
Reviews (6)
Dan Ritenour
Jan 13, 2021
Report
I went to Jay to build a 500 HP 413 c.i. FE ford that rapped quick with great throttle response and I got exactly that and more. He listened carefully and worked with vendors to make my vision reality and ended up with 530 HP with more tuning to go. The car idles smoothly with power brakes and steering yet when it time to go, it runs like a scalded ape. I would reccomend M&R to anybody.
Jeremiah Bridges
Dec 18, 2020
Report
Owner operator " Jay" and I have a long standing relationship spanning 2 decades of business history. He has always been honest pricing and completion in a timely fashion
Zach Stahl
Nov 15, 2020
Report
Positive:Professionalism
I own a diesel repair business and I have been using M&R for over ten years. The workmanship is outstanding and the quality of parts is the best available! I Highly recommend M&R machine shop.
Service:Engine building
I own a diesel repair business and I have been using M&R for over ten years. The workmanship is outstanding and the quality of parts is the best available! I Highly recommend M&R machine shop.
Service:Engine building
Chad Buell
Oct 02, 2020
Report
Positive:Professionalism,Punctuality,Quality,Value
I learn something new every time I go. Very knowledgeable and professional. Cant beat the quality to price ratio, second to none. My go to every time!!
Services:Engine repair,Tuning
I learn something new every time I go. Very knowledgeable and professional. Cant beat the quality to price ratio, second to none. My go to every time!!
Services:Engine repair,Tuning
Rob Cook
Sep 08, 2020
Report
Very knowledgeable about the work and products they sell. Definitely has all of my present and future business.
James Rogers
Aug 18, 2019
Report
I had a Kohler motor overhauled. Jay and his help were very kind and courteous. He gave me an estimate, tore into the motor, saw the problem and called me with the information. I have yet to run motor but I have nothing but confidence in the results. Would recommend .
