How old is my 13-B? - Page 2

Rotary Evolution · 10-08-2013, 12:31 PM

i'm not familiar with a cast number 4, it could be the wrong casting number. it should be located between the water pump and front cover on the passenger side of the engine facing front.

the primary runners are the intake ports in the center iron. the trucks had short ports where the cars had tall ports with the Y casting.

bowjangles · 10-10-2013, 05:43 AM

Well, I couldn't find any casting numbers or letters btw the water pump and front cover, but I did find the letter "R" just near the oil filler tube. I think that is the casting letter. Another person that is trying to help me "date" the engine feels that "R" indicates that the engine was built sometime btw. '74 and '80. Can u confirm this? I would still like to get more specific on the date than the above range of dates.
As far as the "primary runners", I think that they are short and since there are four, I m concluding that the engine is a 4 port.
Other info that might help is : Modern MAZDA logo and twin distributors are on the engine. The mystery continues!

djmtsu · 10-10-2013, 05:49 AM

Twin dizzy engine?

Wow, the plot does thicken!

Rotary Evolution · 10-10-2013, 10:14 AM

sounds like a frankenstein motor, originally put into a pre '75 12a car that had twin dizzies for an upgrade engine swap. not even the '74 had a twin dizzy on the 13B.

10-08-2013, 12:31 PM	#1
Rotary Evolution rotaryevolution.net Join Date: Feb 2011 Location: Las Vegas, NV Posts: 248 Rep Power: 15	i'm not familiar with a cast number 4, it could be the wrong casting number. it should be located between the water pump and front cover on the passenger side of the engine facing front. the primary runners are the intake ports in the center iron. the trucks had short ports where the cars had tall ports with the Y casting. __________________ http://rotaryevolution.net

10-10-2013, 05:43 AM	#2
bowjangles Rotary Fan in Training Join Date: Sep 2013 Posts: 62 Rep Power: 12	How old is my 13-B? Well, I couldn't find any casting numbers or letters btw the water pump and front cover, but I did find the letter "R" just near the oil filler tube. I think that is the casting letter. Another person that is trying to help me "date" the engine feels that "R" indicates that the engine was built sometime btw. '74 and '80. Can u confirm this? I would still like to get more specific on the date than the above range of dates. As far as the "primary runners", I think that they are short and since there are four, I m concluding that the engine is a 4 port. Other info that might help is : Modern MAZDA logo and twin distributors are on the engine. The mystery continues!

10-10-2013, 05:49 AM	#3
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 4,043 Rep Power: 22	Twin dizzy engine? Wow, the plot does thicken! __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

10-10-2013, 10:14 AM	#4
Rotary Evolution rotaryevolution.net Join Date: Feb 2011 Location: Las Vegas, NV Posts: 248 Rep Power: 15	sounds like a frankenstein motor, originally put into a pre '75 12a car that had twin dizzies for an upgrade engine swap. not even the '74 had a twin dizzy on the 13B. __________________ http://rotaryevolution.net

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