Hi guys im new to the site. I have a 03 f250 with a 6.0 and it has 240,000 on it now. I had a couple injectors go bad on me the other day. So I pulled the valve cover on the drivers side because I had a miss and a odd tinging sound from that side. Ended up finding that one of the fuel screens on the out side of the injector was sucked into one of the injectors. I was looking at the head bolt and noticed that they had a sps stamping on the head of all the bolts. Could these be the stoke head bolts? I see everyone talking about the TTY bolts being the stock bolts. Are these bolts aftermarket or does it mean the head bolts have been changed? Any help would be great everyone.

 

Usually head bolts are replaced with studs and nuts. . . Arp is usually used for upgrades and they are obviously different than the stock head bolts. You will see the stud threads sticking up from the nuts.

 

I was just wondering if my head bolts were better than the ones that fail all the time.