Correct pilot bushing or bearing?
 

400 I'm building is going to be a stick. Crank pilot hole measures roughly 1.00, 455 crank I just measured is 1.00. The pilot bushings and bearings I see are listed at 1.093 as well as the Dorman I have.
I know a .090 press fit is a little tight!

This is the pilot bearing I have always used. It is a National 7109.

https://www.summitracing.com/parts/ntl-7109

This bearing fits in the second machined area and not the deepest one.

BOP Engineering sells the exact bearing you need in the Pontiac size. It's just slightly different than the 7109, which will work in a pinch.

Pontiac used the 7109 (907321) bearing from the factory. I attached a NOS 7109 (907321) bearing picture and a copy of a Pontiac service manual for reference. Believe the one BOP sells is a 7109 as well. It does appear to have the same specifications as the National I listed. Wade’s appears to be cheaper in price so that is a good thing.

That's good information. There must be another bearing number that is very close that many parts stores sell that doesn't quite fit right. It is slightly smaller, just a few thousanths on the OD. It will be a slip fit and often spins in the crankshaft. This can make noise and ruin the crankshaft counterbore over time. Just a heads up.

Thanks I was looking at the deepest recess -and tough to get that deep had to use a snap gauge. I didn't not measure the outer one I look at that 7109 specs above looks like a 1.3780 OD I'll see if that goes with my crank.

The new bearing should go in with a light press fit. .0005"-.001". Some people stake the edge of the crankshaft in 3-4 places so it can't walk out.

New Departure 7109.

Chevelle 12 bolt I pulled part to use in the 65 GTO had Hyatt bearings.

BOP one on the way.

BOP is about 0.001 too loose. Trying one form Oreily and Summit

What one did you get from BOP?
I can't believe an SKF BR7109 isn't correct, or National 7109.
Shield on one side (goes outward, towards clutch), open on other (goes toward crank).
6202 has shields on both sides and is wider.

I know it sounds a bit crude, but Pontiac staked the crank in a couple of places to help retain the bearing. My factory 4 speed 76 Trans Am engine was done this way. I have done this along with using some green loctite on the edge to retain the bearing.

it just says 7109 on the one from BOP. Oreilly one should be in today. Is there a plain bushing? Ames has one listed.

Did the BOP unit come with a shield on one side? Looking at Butler, it looks like a no shield bearing. https://butlerperformance.com/i-2445...-bca-7109.html

or use loctite made for bearing setting(green)

Yes the BOP has a sealed side and an open side. Picking up one bearing and a bronze bushing tonight and going to mike them all.

Got a bushing and another bearing (Precision) at Oreilly and got out the mike
BOP shielded one side 1.3773-easy to pull out
Precision open both sides 1.3777-easy to pull out but a little snugger
Dorman 690-023(has other numbers stamped on it) Bushing 1.3792 Feels a little snugger but there are some sharp edges at the chamfer for the input shaft I want to hit with a jeweler's file before I see if it is snug

I think the specs published are supposed 1.380

Curiosity got the best of me so I measured one of my extra 7109 bearings and a 428 crankshaft. Used a snap gauge and calipers to measure the crank. In the past, I have always had to lightly tap mine in. I’ve staked the crank and have used some green loctite just to be safe before. But have also ran them without doing either. Have used this bearing probably 6-7 times in the past. This particular bearing isn’t loose in the machined area on this particular crankshaft. Definitely odd that yours drops in like that with no resistance. Maybe there will be a bushing that will get the job done for you.

Summit's is a National Bearing 7109 with PEER and China stamped on it. Sealed one side OD 1.3775

Dorman bushing is magnetic. looking through old thread Ken (Pontiac Dude) said even old ones were and no issues if a dab of grease.
McLeod has a 1380-1 Pontiac (as well as -7 extended) that are listed as oilite.

Back from my friends cabin. Measured the National I had vs. the NDH that was removed and they were close to each other using my 0.001 dial caliper. But, I didn't use the National for some reason (see later) other than the width was 0.352" vs. 0.354" (NDH). Real reason was 8 bearings vs. 9 on original.

Got a spec?

So got the McLoed today Comparison to Dorman
Dorman -actual stamped 0174523 OD 1.3795 ID 0.595 thickness 0.436
mcLeod OD 1.3819 ID 0.5935 thickness 0.351

BOTH are magnetic. In their catalog it does not list the Pontiac as oilite whereas the SBF same OD is-different ID, and some GMs. They do make a thicker one for Pontiacs.

OE (NDH) was...
9 bearings
OD 1.3770" (34.97mm)
ID 0.5900" (14.99mm)
Width 0.3530" (8.97mm)


National was...
8 bearings
OD 1.3765" (34.96mm)
ID 0.5900" (14.99mm)
Width 0.3520" (8.94mm)


L&S was...
8 bearings
OD 1.3765" (34.96mm)
ID 0.5900" (14.99mm)
Width 0.3510" (8.93mm)


What I did use was ordered under PN 15533265.
9 bearings
Nothing else was checked at the time.

Dorman was snug but could push in with fingers so went with the McLoed it had to be tapped in with a little force