Has Anyone Ever Used Grade 5 Bolts As Head Bolts. Any Success?

Discussion in '1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-' started by fords2live, Jun 16, 2013.

  1. fords2live

    fords2live Member

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    I can't use my tty bolts again obviously and the parts store only had one side on hand and I had to make a car show so i just grabbed some bolts from the hardware store. A guy told me that they wont hold. Does that mean they're gunna stretch? Arent tty bolts ment to stretch with the head anyways?
     
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  2. mikestang63

    mikestang63 Mustang Master

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  3. srtthis

    srtthis the guy doing it does every local racers rear end

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    Not something I'd even risk... To much to lose nothing to gain. Even if it holds when you go to replace them your out another set of head gaskets another set of intake gaskets another set of header gaskets. Not to mention the time...
     
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  4. 85_SS_302_Coupe

    85_SS_302_Coupe it sucks (I know) to be on the receiving end

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    I have parts store replacements on mine right now and one random 1/2 grade 8 because the prick I bought my block from failed to mention that one of the head bolts was stripped out from the block so I had to drill and tap it a size larger. I haven't had any issues yet.
     
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  5. 7991LXnSHO

    7991LXnSHO Well-Known Member

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    Grade 5 just risks too much. You are holding in an explosion and spinning parts under a lot of force. TTY bolts only are measured to stretch as an alternative to just torque. If you have to be cheap, a used TTY would be better than grade 5 hardware. But how you measure yield and torque the second time is beyond me and experts, hence the one time only rating. ARP has earned its reputation.
     
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  6. Gearbanger 101

    Gearbanger 101 Straight Outta Locash
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    If he pulls the cheaper bolts out one at a time starting in the center and torques the new ones in their place in steps, he should be fine afterwards. As long as he's not pulling the head off the block, disturbing the gaskets, they shouldn't' distort.
     
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  7. srtthis

    srtthis the guy doing it does every local racers rear end

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    buddy of mine did that with his truck to put head studs in. im just not sure try that one.
     
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  8. Gearbanger 101

    Gearbanger 101 Straight Outta Locash
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    I've seen engines that had run for years, only to find out during their eventual rebuild time that one or more of the head bolts had broke or let go at some undetermined time prior, without the owner being the wiser. Didn't even use antifreeze. Same goes for intake bolts. lol

    These old 302's are pretty robust as long as you're not throwing a lot of boost or spray at them. :D
     
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  9. mikestang63

    mikestang63 Mustang Master

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    Who knows if he even got accurate torque reading using those bolts, as their stretch point is pretty much done before the grade 8 even starts. Did the OP use oil, assembly lube, thread sealant on the threads and what did he torque them to? What kind of head gasket did you use?

    I also think that if he only drove it a few miles, he can try and pull the bolts out one at a time and replace them. Hopefully he won't disturb the head or gasket. The only problem is you'll always be wondering when the head is going to lift. He needs to keep an eye on the temp, coolant, oil, etc. for any telltale signs.
     
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  10. Bryan83taco

    Bryan83taco Active Member

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    That's a lot riding on cheap hardware store bolts. I wouldn't do it. Spend the extra cash on ARP bolts and have some piece of mind.
     
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    srtthis likes this.
  11. Shakerhood

    Shakerhood Well-Known Member

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    I would not take a chance.
     
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  12. clement

    Founding Member

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    considering oreily has felpro 302 headbolts for $23, and Mr Gasket bolts for $32, I don't know why you would run hardware store stuff. my buddy has a set of pro comp head studs (against my advisement) on his 410 with 14:1 compression. I know people have had issues with those, but he has been lucky. and those are only $40.
     
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  13. 90lxcoupe

    90lxcoupe Mustang Master

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    Dont be a hack, put the right ARP bolts in it, or use studs.
     
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  14. jadigen

    jadigen Member

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    making a car show isn't worth the risk of a catastrophic failure. call summit or jegs and buy the proper head bolts for it and do it right the first time..
     
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