This is a set of 9 NEW 1/2" x 6" long head bolts for IH D166 D188 D236 D282 and D301engines in IH - Farmall 460 504 560 660 656 656 706 Tractors . These bolts have the following specifications. These are the best replacement head bolts for D188 ,D236 . D282 and D301 engines that I have found. I have been using them in my shop for the past 5 years with excellent results.
I also have the longer head bolts listed . I have over 25 yrs. experience of rebuilding IH tractor and motors and have many parts available . Email your questions and I can probably help you