Thread size engine to bellhousing

[Wietse]

Hey all,

What size threads are on the engine for connecting the bell housing of a 440 engine to 727 tranny?
I need to get some quality threaded bars & nuts to hook up the engine on a engine stand and am not sure i can use the original bolts due to lengt required to go through the bracket of the engine stand.
As it will be UNC, that is not a "off the shelf item" to get here in a Metric world.

 

[lewtot184]

3/8"-16 for block holes, 7/16"-14 for the two lower trans holes.

 

[Wietse]

Thx lewtot184!
I will get some quality studs, bolts and washers for my project ready.
If you go in a hardware store here you will not find any UNC/UNF fasteners so i always need to order something online.

 

[lewtot184]

if it were me i'd look at the factory type bolts/studs. these can probably be purchased from a restoration business on line. I use factory bolts in both my cars and prefer them. the starter has a stud/bolt combo that i'd look at too.

 

[Wietse]

if it were me i'd look at the factory type bolts/studs. these can probably be purchased from a restoration business on line. I use factory bolts in both my cars and prefer them. the starter has a stud/bolt combo that i'd look at too.

Whenever i will build it back together i will replace any worn/damaged bolts, just for now i need something to bolt the engine on my engine stand to work on it.
I had it before with another engine i found that the original bolts were too short to use on the engine stand so now i want to be prepared and have something to make life easy.

 

[SublimeSixpack]

Whenever i will build it back together i will replace any worn/damaged bolts, just for now i need something to bolt the engine on my engine stand to work on it.
I had it before with another engine i found that the original bolts were too short to use on the engine stand so now i want to be prepared and have something to make life easy.

FWIW I'd go with Grade 8 bolts.

 

[91r/t]

if it were me i'd look at the factory type bolts/studs. these can probably be purchased from a restoration business on line. I use factory bolts in both my cars and prefer them. the starter has a stud/bolt combo that i'd look at too.

Agree 110%! My car had ARP bolts in for the bell housing bolts when I got it and I hated them. Had small heads on them and just didn't fit well like the stockers do. I prefer the stock stuff as well.

 

[Wietse]

Yes i will take some high grade fasteners for assembling it on the engine stand.
I think all fasteners currently keeping engine and tranny together are original, if not i will get a set from somewhere.
Those ARP bolts are good, but as you mentioned for some applications not.
Or they are absolute overkill for the purpose.

Thx for the input gentlemen!!

 

[slepr1]

If you need more info on the bolts, ARP sells the ones you need and displays the measurements in the description. I tried finding off the shelf grade 8 but couldn't find. I got ARP.

 

[Wietse]

I found a local webshop here who does UNC and UNF fasteners, high grade threaded rods.
That should do, guess a 440 with all accessories unbolted is around 300-350 kg right? (650-700 lbs)

Engine stand is rated for 500kg so should be good!

 

[Dipstick]

I've never used anything but Grade 5 bolts on my engine stand, anything more is a waste of money.

 

[lewtot184]

iron 440 should be around 650lbs.

 

[Wietse]

I've never used anything but Grade 5 bolts on my engine stand, anything more is a waste of money.

The ones i found are actually advertised as grade 8.8, which is the metric grade indication.
8.8 is similar as grade 5.
Grade 8 would be like 10.9 in the metric system.

iron 440 should be around 650lbs.

Few weeks ago i had my straight 4 cylinder engine from my VW Golf G60 in the engine stand, which will be a joke in managing compared to this big bastard.