chuck2422

I have looked through many threads but still don't know if my 1991 5.8 head bolts are tty or not. The manual shows you're procedures at roughly 55 then 115. The bolts have the head with the washer flange and three bolts reduce in size part way down the stem. Does anyone know for sure? Beater truck that I don't want to fork out an additional $80 on bolts

coldbrains21379

If the bolt heads have a flared integral washer they're torque to yield. If the bolt heads are straight forged and require a separate washer they are regular torque to spec bolts. TTY bolts can be reused though not recommended. TTY bolts have a different torque spec for short and long bolts but the same yield angle.

qdeezie

I can not confirm it, but I've always heard that you can get away with reusing TTY bolts on cast iron heads, but not so much on aluminum heads.

Whether or not it's true, I don't know, but that's something you can look into.

chuck2422

Thanks for the input, I do have the bolts with the flared integral washer and the stem reduces in diameter part way down. I don't understand why it isn't clearly published somewhere.

Flareside302

just go buy new head bolts anyways.. it's not a much money... like 50 bucks or something...

Just call me Sean

iTrader: (1)

Here you go:

Just call me Sean

iTrader: (1)

Sorry, that's 5.0. No mention of TTY for the 5.8.

chuck2422

I appreciate all the help. My father and uncle have worked for Ford for a considerable time (over 40 years) and they don't have a clear answer. The bolts are only $70 or a little more. I did have Orielly auto parts tell me that they don't show them as TTY, but I am still buying them. Autozone and others had no clue.

Andrew95

upgrade to ARP bolts!

http://www.summitracing.com/parts/ar...view/make/ford

and i recommend this stuff with them.

http://www.summitracing.com/parts/ar...9910/overview/

Flareside302

those are the low end ARP's.. they arent a ton better than stock...
but they dont cost alot extra.. might as well do it..


the assembly torque lube is DEFINATLY needed.. gets a more accurate torque reading...