Scat crank to big input toploader pilot bearing size

[Jb427]

Any one know off hand the size of a scat 4.250 6.7 rod crank's pilot bearing OD and ID gear box is a big shaft toploader?. My engine is still at my builders.

[BattlestarGalactic]

Same as std Ford.  I run a sealed bearing....6303RD.  The pilot is the same for a big or small input.  The difference is the length between small bolck and big block.

[Jb427]

ID 17mm OD 47mm width 14mm?

[Barry_R]

1.850

[6667fan]

Not the O.P.’s concern but it might come up. The depth on a Lakewood bell face to bottom of Scat crank pocket is 7 5/16”.
Plenty of room for longer input shaft.

[Jb427]

1.850

ID 669.291 OD 1850.39 width 551.181 sound right in all dimensions?

Not the O.P.’s concern but it might come up. The depth on a Lakewood bell face to bottom of Scat crank pocket is 7 5/16”.
Plenty of room for longer input shaft.

It may come up i have a lakewood scattershield fingers crossed i may get engine back this weekend.

[cjshaker]

I would recommend the SKF or Timken bearing, and to stay away from the cheap ones. I get mine at our local Napa, but I'm sure most parts carriers can get them.

[Jb427]

Got my engine back today and from the crank end plug i only have around 6.4" to the face one the scatter shield. I did really quick and dirty look today imput shaft will be too long. Can some one fill me in on how the big block 1-3/8" short imput shaft was different to a long/small block one?. No fords over here really came out with big block.

[6667fan]

JB, the spec I contributed was meant to put your mind at ease in the event you had the input with the long nipple on the end. That long nipple should still have enough space as it goes through the pilot bushing and not bottom out in the Scat crank.

Regarding input shaft length on the big I/O toploaders I get 6- 6.125.” This is from trans face to end of nipple.  That would work with 6.4 spacing. You just need to be certain that the splined section of the input is not right against the bushing. Sometimes tolerances stack up against you.  A “proud” pilot bushing could cost you some wiggle room. Measure very carefully.

[Jb427]

That 6.4" is from gear box face side of my bellhousing tight to the plug inside the crank so my bellhousing looks to be a 6-1/4".

JB, the spec I contributed was meant to put your mind at ease in the event you had the input with the long nipple on the end. That long nipple should still have enough space as it goes through the pilot bushing and not bottom out in the Scat crank.

Regarding input shaft length on the big I/O toploaders I get 6- 6.125.” This is from trans face to end of nipple.  That would work with 6.4 spacing. You just need to be certain that the splined section of the input is not right against the bushing. Some times tolerances stack up against you. Sometimes a “proud” pilot bushing will cost you some wiggle room. Measure very carefully.

I will be fitting and checking every thing just one of those things that pops up. Like bbm block not coming with bellhousing dowel pins..  missed that one too.

[Jb427]

Can anyone tell me dose the scat crank rear centre freeze plug have a set install depth or is there a lip inside that locates the depth you can install it at? i want to check mine and make sure it is set right.