Head studs will fit the 1974 to 1980 2.3L inline four Ford engine, Rated to 190,000 PSI. 190,000 PSI studs will keep your motor together. These ARP fasteners are second to none. Don’t have stock bolts let you down when you least expect it. Showed up early fit perfect. By Just josh’n ya on March 04, 2021. Nice website easy to use found the right head studs i was looking for to get my 2.3l ford head studded down extra tight. Yes, I recommend this product. 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 71 years.