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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: st3vomettler on May 29, 2015, 11:23:43 am

Title: Engine
Post by: st3vomettler on May 29, 2015, 11:23:43 am

I bought a 86 305 to put in my truck so I could drive it and I got the casting number off the back of the block and the suffix code off the front. The suffix code doesn't make the block and I was wondering what that meant.

Title: Re: Engine
Post by: Irish_Alley on May 29, 2015, 04:45:38 pm

confused about your question. the suffix code doesnt make the block?
are you saying the suffix code doesnt match up to the casting numbers?
http://www.nastyz28.com/chevy-engine-code-stampings.php#suffix

Title: Re: Engine
Post by: st3vomettler on May 29, 2015, 05:02:27 pm

Yes the suffix code doesn't match the block I was wondering what that means

Title: Re: Engine
Post by: Irish_Alley on May 29, 2015, 05:14:38 pm

could be a reading error on your part or a typo lol. see if you can post good pictures. what i do is take soap stone or a crayon on the suffix code and rub the area down really good then wipe it clean and it should only leave crayon in the concave parts. then for casting numbers i just lightly rub the raised areas and it highlights the letters and numbers

Title: Re: Engine
Post by: st3vomettler on May 29, 2015, 05:47:58 pm

14088551 is the casting number
V0204UFC is the suffix code

Title: Re: Engine
Post by: Irish_Alley on May 29, 2015, 06:33:38 pm

1986 305
Flint(v) Feb(02) 04(day)    1980 350 (UFC) suffix code

ONE NOTE: Casting #'s will trump the code on a descrepancy. Take the above CLJ example. In 1987 CLJ is a 305 L69 in a monte carlo, or in 1971 it's a 400 from a monte carlo. So when the arguement over 305, 350 or 400 comes up... now you look at the casting #. 3970010.... bang, it's a 350. That eliminates the 400 and 305 possibilities.

if your codes are right i would go with 1986 305 (casting numbers)

Title: Re: Engine
Post by: st3vomettler on May 29, 2015, 07:40:52 pm

Ok thank you