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Can I use stainless steel bolts inside an engine?
I'm wondering if I can use some ARP stainless steel bolts inside my dodge 360 engine (claimed to be stronger than grade 8 bolts, they are 170 000 psi bolts) I am wanting to use them as hold down bolts for my rocker shafts because one of the old studs broke off. I would usually buy the regular chromoly arp bolts but they were out and I thought stainless would be fine. The shafts need to be torqued to 15 pounds, so not a lot. The heads are aluminum so I assume I would need to use some grease or anti-seize to prevent cold welding. Can I use these bolts? Or should I just wait and get some chromoly ones? And will I have issues keeping them tight? Because I know stainless doesn't stretch as much, would some blue lock tight be the solution to that?
2 Answers
- the_boy_toyLv 77 years agoFavorite Answer
Like the other person said, stainless steel and chromoly arp bolts have different expansion rates. Just like a diamond, the stronger it is, the more brittle it is. The stretching of the bolt as it is under a load will probably snap it.
Source(s): 30 yrs home mech and Mech Eng - dallenmarketLv 77 years ago
I would use the recommended bolts. Stainless has different heat characteristics than chrome-moly. The expansion rate could cause problems as the stainless will absorb and transfer heat and not expand as readily. Bolting into aluminum heads will compound the problems.
