


ARP Main Stud Kit for Ford Side bolts - Early cast iron block M8
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
ARP Main Stud Kit for Ford Side bolts - Early cast iron block M8SKU: 156 5201 UPC: 672036037727 ARP Main Stud Kit for Ford 289 302 351W Early Cast Iron Block M8 Side Bolts ARP 156 5201 main stud kit secures main caps in Ford 289 302 and 351W engines with early cast iron blocks and M8 side bolts found in vehicles from 1962 to 1995. This kit delivers consistent clamping force to handle high horsepower builds in classic Mustangs trucks and vans. It stops main cap walk eliminates fretting and shields block threads
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4.3 ★★★★★
Based on 104 reviews
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Product Reviews
★★★★★ 5
Spark-tacular Revival for My Lawn Chariot
Ordered this OEM 2-pack of Champion spark plugs (Kohler 25 132 23-S / 2513223S) for my Kohler Command K OHV 7000 series (KT725) engine, and let me tell you—these little lightning bolts mean business.
Installation? Easier than pretending I’ll read the whole owner’s manual. Pulled the old plugs, threaded these pre-gapped beauties in, torqued appropriately, reconnected, and boom—instant ignition enthusiasm. The engine fired up like it had just downed a double espresso.
It’s still too early in the season to mow, but I couldn’t resist a test run. Converted the tractor mower into a full-blown leaf-blasting machine and sent it down my 1/10-mile driveway like a suburban hurricane. Leaves scattered. Neighbors stared. Power was smooth, responsive, and downright smug.
Idle is steady. Throttle response is crisp. No sputter, no hesitation—just clean, confident combustion. Exactly what you want from OEM-spec plugs.
If your tractor’s been sounding like it’s negotiating with itself before starting, do it a favor. These plugs brought mine back to “runs like a champ”… which, given the name, feels poetically correct.
Five stars. Lawn domination pending.
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Reviewed in the United States on February 16, 2026
★★★★★ 5
Amazon makes it so easy
Perfect fit, exact replacement part.
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Reviewed in the United States on May 13, 2026
★★★★★ 5
Reliable and well priced
Works very well in my Cub Cadet XT1
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Reviewed in the United States on May 20, 2026
★★★★★ 5
Installed them works good.
Value for the money.
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Reviewed in the United States on March 10, 2026
★★★★★ 5
Good Plug if you need this model
These are the OEM for Kohler 7000 series I did service on. They needed to be gapped but that’s every spark plug.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 19, 2026
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