Difference between A, B, C, D and E Blocks
Junior Member
Joined: May 2006
Posts: 21
From: Lubbock Texas
Mine was marked the same way. F one the front..C on the center...and R on the rear. My motor didnt appear to ever been into so I assumed these were factory marks.
Bob Mears
My 20B showed signs of being messed with. The rotor housings were stamped with F, C(or M), R and the oil pan surface at the bottom of the engine had been scraped. The production number is #756. Do you think the shaft was replaced at some point?
Bob Mears
Originally Posted by Jeff20B' post='769369' date='Oct 14 2005, 01:59 PM
My 20B showed signs of being messed with. The rotor housings were stamped with F, C(or M), R and the oil pan surface at the bottom of the engine had been scraped. The production number is #756. Do you think the shaft was replaced at some point?
Senior Member
Joined: Nov 2001
Posts: 2,284
Perhaps they are factory marks. Perhaps only the rear oil pressure regulator was changed. It reads up past 100 psi when cold. I think it was j9fd3s that said the 20B only came with 70 psi stock, and only the FD was higher. Maybe some of the 20Bs were higher too?
I'm very curious to see which shaft is in my engine.
I'm very curious to see which shaft is in my engine.
Senior Member
Joined: May 2002
Posts: 22,465
From: California
Originally Posted by RX8Guy' post='825660' date='Jun 23 2006, 09:09 AM
Mine was marked the same way. F one the front..C on the center...and R on the rear. My motor didnt appear to ever been into so I assumed these were factory marks.
Bob Mears
mine was stamped 246 on all the housings...
Junior Member
Joined: Mar 2005
Posts: 18
Also, the thick intermediate housings have a thicker/reinforced dowell area on the D-series engine. I've seen two straight of the crates like that. Not sure if they started that with the C or D series but my B series engine certainly doesn't have the thick plate reinforced. Only the front iron is reinforced on my B-series engine.
Member
Joined: Nov 2003
Posts: 41
My engine is stamped with D571 I believe. It looks super clean and it definitely wasn't easy to get ahold of. I plan to install it in my FD over the winter and will do a compression check before doing so to make sure everythings up to par.
Senior Member
Joined: Nov 2004
Posts: 147
From: Europe, Belgium
Originally Posted by RX8Guy' post='825660' date='Jun 23 2006, 05:09 PM
Mine was marked the same way. F one the front..C on the center...and R on the rear. My motor didnt appear to ever been into so I assumed these were factory marks.
Bob Mears
Bob Mears
Ehm..
F means front, C means center and R means rear.. this is for the way the egr crap in the housings is located..
Normally the production number is around the 20B area above the spark plugs..
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