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ARP Main Stud Kit for Ford Side bolts - Early cast iron block M8
ARP Main Stud Kit for Ford Side bolts - Early cast iron block M8
ARP Main Stud Kit for Ford Side bolts - Early cast iron block M8
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ARP Main Stud Kit for Ford Side bolts - Early cast iron block M8

Marsoni M251S
Sale price$63.73
Pay 4 payments of $15.93 a month.Shop Pay
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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  • Express: 1-2 business days

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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 1611 reviews
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Product Reviews
R
Verified Purchase
Raptor
Los Angeles, US
★★★★★ 5
Near OEM quality at 1/4 cost
Near OEM performance at 25% of the cost! Bosch Quality replaced NGKs/Toyota OEMs. Great value and now the engine is running smoothly! I have seen a slight improvement in my mpg @1mpg overall in mixed driving conditions.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2026
J
Verified Purchase
Joe H.
Los Angeles, US
★★★★★ 5
Very Expensive
Had one cylinder misfiring so replaced coil and spark plug. Runs fine now, but old plug looked shot after only 5 months so I think the coil was the problem. Really good plug so far but very expensive.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 12, 2026
R
Verified Purchase
rkab8745
Grantham, US
★★★★★ 5
A reliable set of spark plugs.
They’re made in Germany, what else can you say
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 24, 2026
A
Verified Purchase
Amazon Customer
Lake Worth, US
★★★★★ 5
Work as well as the NGK's
Bought for a 2016 Mazda 6, I had NGK's in it for 5 months and had misfires, didnt have the money to throw more NGK's at it for troubleshooting. Bought these to try and they work great so far.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 29, 2026
C
Verified Purchase
Christopher D. Bodirsky
Birmingham, US
★★★★★ 4
Faulty plug? Otherwise great set
Definitely better than the old plugs that probably had 80k miles on them. The one star off is because I had a misfire after installing. Not sure if I damaged the plug or what, but a reinstall didn't fix the misfire. In my genius, I rushed to try to gap it and ended up breaking the iridium tip. Put the old plug into cylinder 3 (where the misfire was) and it was fine. Gonna have to get a new single tomorrow at my local shop, but a bit frustrating to get a misfire after install.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 27, 2026

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