The Ford Barn

oldford2 · 07-30-2014, 04:48 PM

Just curious,
The main bearing caps on a 50 Ford 8BA I am working on are marked:
Rear.......8BA 6325
Middle...7RA 6330B
Front.....7RA 6329

All fit and measure to spec.. Just curious on the 7RA?
Thanks
John

Ol' Ron · 07-30-2014, 06:49 PM

Yes I've noticed allot of AB soup on main caps for years and often wondered why. At first I bore checked everything. Now I just drop in the crank and spin it. Next use plastic gauge and check for size and taper. It won't turn with the wrong cap.

flatjack9 · 07-30-2014, 07:10 PM

I think the 7RA refers to the fact that the engine was introduced in the 1947 for the R series pickup. OOPs, I should have said 1948.

oldford2 · 07-31-2014, 12:32 PM

Quote:

Originally Posted by flatjack9

I think the 7RA refers to the fact that the engine was introduced in the 1947 for the R series pickup.

Does that mean that the 47 pickup had an 8BA block?

Ol' Ron · 07-31-2014, 02:43 PM

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It just means the caps were interchangable, before use as a casting. Once machined it's just for your block. When Line boring a 59 block use an 8ba style fron and center cap stronger. So I'm told.

07-30-2014, 04:48 PM	#1
oldford2 Senior Member Join Date: May 2010 Location: pittsfield, MA Posts: 2,086	Main bearing caps Just curious, The main bearing caps on a 50 Ford 8BA I am working on are marked: Rear.......8BA 6325 Middle...7RA 6330B Front.....7RA 6329 All fit and measure to spec.. Just curious on the 7RA? Thanks John

07-30-2014, 06:49 PM	#2
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Main bearing caps Yes I've noticed allot of AB soup on main caps for years and often wondered why. At first I bore checked everything. Now I just drop in the crank and spin it. Next use plastic gauge and check for size and taper. It won't turn with the wrong cap.

07-30-2014, 07:10 PM	#3
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,526	Re: Main bearing caps I think the 7RA refers to the fact that the engine was introduced in the 1947 for the R series pickup. OOPs, I should have said 1948. Last edited by flatjack9; 07-31-2014 at 05:10 PM. Reason: wrong year

07-31-2014, 02:43 PM	#5
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Main bearing caps Sponsored Links (Register now to hide all advertisements) It just means the caps were interchangable, before use as a casting. Once machined it's just for your block. When Line boring a 59 block use an 8ba style fron and center cap stronger. So I'm told.