While Paul contacted me directly regarding what the ‘FT’ designation means in relation to the grade value, I was not able to help.  While the grade five and grade six bolts do have slightly smaller shanks than the grade eight bolts, the ‘FT’ bolts do have the same shank size as the grade eight bolts.  Based on that alone, it’s easy to surmise that the ‘FT’ bolts are grade eight without any additional information or testing to point elsewhere.  Nowhere in my literature is there any reference to what the ‘FT’ bolts are in regards to their grade values.  Any additional information regarding this is welcome.
 
What is interesting is the recommended torque values for the various grades of bolts.  The 716" grade five and grade six bolts are being pushed well beyond the factory head bolt torque spec recommendations based on the following chart.
 

Lorena, Texas (South of Waco)

Anybody know what grade the "FT"  bolts are in Ted's picture?

Paul

Well I will have plenty of washers. I didn’t know ARP included the washers with the bolt packages. You don’t need to buy the washer packs I listed before 

Duane

I used a stud set for Mopar, small block, to get the stand off studs for a windage tray.  They are a little longer than the main studs I got from Mummert a long time ago.  Mopar main bolts might work but because of that extra length, you do want to check to ensure that the bolt doesn't bottom out or block off oil passages before proper torque can be applied.


Lawrenceville, GA

Glad you found something workable. I had a feeling Cat would be a PITA, especially for anything out of their ordinary. The machinist who rebuilt my heads ordered me a set from McMaster-Carr. The long bolts are a 1/16" short at 4" even but since he took 0.007" off the heads to make 'em flat the 4" bolts will be OK. 

Update and what I ended up with. Bolts from the Cat dealer was more problem than I wanted to deal with. They didn’t have what I needed in stock but would order them but would be charged shipping. I went on line and found ARP 12 pt bolts and champherd  washers from Summit Race. FreeShipping.For Dobie and anyone else needing info here is what I bought.  Main bearing bolts 3” # 617-3000 . 2 packs of 5 @$22.99 & 1 pack of 10 washers 1/2”# 200-8533 @$9.99 For the head bolts 1 pack of 5 4 1/2” #645-4500 @$27.99 (there will be 1 extra)2 packs of 5 41/4” #645-4250 @$26.99 (4 extra) 2 packs of 5 of 21/4” # 645-2250 @$17.99 and 2 packs of 10 7/16 washers # 400-8539 @$12.99 along with some assembly lube@$7.99. All totaled $146.92 . the longer bolts were back ordered but everything else got to me in 2 days. There may be some trimming but not much using the .120 thick washers . I hope this helps someone. I spent several hours researching.

Duane

No offense implied or taken.  I’ve come across at least four different head bolt grades during the course of Y production.  The grade eight versions do tend to show up more on the 1963-64 truck engines.  Those I’ll reuse but the rest I treat like ‘torque to yield’ hardware and discard.  Here’s a picture of what I currently have laying loose as far as oem Y head bolts.
 

Lorena, Texas (South of Waco)

My ‘overkill’ statement simply comes as a result of the cost of the ARP versus grade 8 bolts being purchased elsewhere.  The key here is the quality of the bolts as bolts being made overseas may not be the actual grade as they are advertised as being.  I do use a lot of ARP fasteners regardless of the cost simply due to the known quality of those fasteners.

I meant no disrespect if taken.

That's is what I was wondering if the ARP cost was a factor in a simple stock rebuild. And 10-4 on off-shore counterfeit fasteners. The airline industry had that problem some years ago if you remember and it trickled down to automotive, incl FORD.

Now weren't factory fasteners of that period GRADE 5? Just wondering and I agree with the GRADE 8 upgrade.

I can't afford to pi$$ you off as I learn so much from you ...

____________________________

My ‘overkill’ statement simply comes as a result of the cost of the ARP versus grade 8 bolts being purchased elsewhere.  The key here is the quality of the bolts as bolts being made overseas may not be the actual grade as they are advertised as being.  I do use a lot of ARP fasteners regardless of the cost simply due to the known quality of those fasteners.
 
I attribute most head gasket issues with the Y resulting from the use of grade 5 and grade 6 head bolts.  Those bolts are notorious for not holding their torque for the long haul.  Possibly stretching over time?  While the use of steel shim head gaskets does contribute to the need to re-torque the head bolts after initially running an engine, the stock grade five and six head bolts simply reinforces that need.  I have zero issues with grade eight head bolts in regards to long term head gasket seal so I simply make it a point to use grade eight head bolts on most applications.  Likewise I do not find it necessary to re-torque composition head gaskets when used with grade eight head bolts.

Lorena, Texas (South of Waco)

I think I have it figured out. I took another stab at the caterpillar parts site and found lengths that will work with minimal trimming and using washers I will go to the Cat dealer next week to see if they have what is listed on the website. I’ll post what I find out . 

Duane