MTFCA Forum

Hi all,
Can someone tell me what is the correct length of the bolts that secure the intake and exhaust manifolds to the engine block? Thanks,
John

2 that I know of, 2-11/16" and 3-3/16"

NY John T wrote: ↑

Sun Jun 30, 2024 10:14 pm

Hi all,
Can someone tell me what is the correct length of the bolts that secure the intake and exhaust manifolds to the engine block? Thanks,
John

By George_Cherry Hill NJ on Tuesday, July 16, 2013 - 05:45 pm:
Evolution of 3066
3066/T516 was used on the 09-11 @3-5/16� long
3066/T516 (no revision but was probably 3066B) was used on the 11-24 @3-1/4� long
3066C/T516B was used on the 24-26 @ 2-5/8� (used with gull-winged clamp)
3066C2/T4882 was the bolt version used on 27 @2-5/8� from the bottom of the bolt head
As to source, the shown dates are based on Bruce best guess

I have never seen an original manifold bolt. There were different length manifold studs. The later style with the two way mounting clamps on the improved cars were shorter, and most had a shoulder on the end which was screwed into the engine block.

Allan from down under.

Allan

Here are original manifold bolts for the late T, nickel plate dome head.

And the two types of studs, the shorter stud for the '24 and later 'recessed' or butterfly clamps.


With the new style in '24 of the recessed clamp, Ford engineers designed it to also fit an early engine with the longer studs, just reverse the recessed clamp for a long stud.

Thank you all for the responses to my question. I actually realized that I had the retainer in backwards and that made the bolt too long. Today, I reversed the retainer and the bolt fit perfectly. Duh!
So good to have a group of people to help,
John

Thanks Dan for the photos. I will have to keep a look out for 3/8" fine thread nickel plated dome head bolts now that you have alerted me to their existence. Maybe our Canadian sourced cars never had these. We learn stuff every day on this forum.

Allan from down under.

I am not aware of bolts being used. As noted above studs were used. The clamps can be reversed on some later types to fit different lengths.

Original Smith wrote: ↑

Tue Jul 02, 2024 11:33 am

I am not aware of bolts being used. As noted above studs were used. The clamps can be reversed on some later types to fit different lengths.

I have a set

That's a "stud" Frank - not a "bolt".

RajoRacer wrote: ↑

Tue Jul 02, 2024 1:49 pm

That's a "stud" Frank - not a "bolt".

That 'stud' is just Ford's price list lingo, it was a bolt.

Should have pulled this screen shot from Bruce's C-D encyclopedia. Even gives the length that OP wanted

Maybe so Dan but it does list "stud" & the illustration shows the same !

Steve

With respect can assure you, the last manifold clamp fasteners became bolts with dome heads. Many '27s have these, have seen plenty.


The Factory Numbers are there for the nickel head bolt, so that is the specification.

Factory No. 4482 for the Part # 3066C2 Bolt, nickel plate dome head 2 5/8"

Factory No. 516B for the Part # 3066C Stud 2 5/8" for the new style 3065 'reversing clamp'

Factory No. 516 for Part # 3066 Stud 3 1/4" for the earlier clamp

Lots of times the illustrations in the Price List of Parts won't match as they can be earlier pictures, most times the newer parts may or may not be listed and without updated illustrations.

Dan

I also have an original '27 engine with bolts holding the manifolds & valve cover - not arguing the bolt fact - just that the Price Lists of Parts apparently don't relay that information - I'll check out my original lists.

There are numerous word differences/meanings and the pronunciation of words over time.
There is no question that in 1927+ the Ford Parts List called 3066C2 a "stud" not a "bolt"
In Today's English we visualize
-a stud has having two threaded ends whereby one end is intended to be threaded into a block and the other end threaded for a nut to secure an item
-a bolt having a head and a threaded end for a nut to secure an item.

This isn't a "what kind of oil" question so let it rest

Canadian/overseas parts book call it 3066D clamp bolt 1927.