In need of engine decoder help!
 

I have a 66 c10 and I've decoded the VIN already,but I am having a hard time finding out if it is a 230 or a 250. I have read that the 250 came in that year but a few signs point to the 230.

Re: In need of engine decoder help!
 

Not familiar with that number. Can you post some more pictures of the rest of the engine, including the other casting numbers?

Welcome to the forum, BTW.

Re: In need of engine decoder help!
 

also further away pic for location of distributor please.
only one I find even close is 3877178 and thats a 230 or 250.
However it doesnt look like in your pic that the 3 was ground off the serial.

Re: In need of engine decoder help!
 

That was the issue I was running in to. Here are some more pics, hopefully they help.

Re: In need of engine decoder help!
 

Another pic.

Re: In need of engine decoder help!
 

The date code has 6 for the year, so it's a '66 or '76. Given that the truck is a '66, I'd guess it's probably the 250 that came in there. AFAIK all trucks '66 and later had the 250.

A way to tell would be to see if you can determine if the pistons are dished or not; a 250 has dished pistons and 230's have flat top pistons.

Re: In need of engine decoder help!
 

What is it that makes you think it's a 230, anyway?

Re: In need of engine decoder help!
 

When I first started searching for this I found a forum that said if it is a two pulley system it's a 230. Another reason is that it is a base model so If the 230 was available I figured it was that.

Re: In need of engine decoder help!
 

Not sure what that guy was smoking! Lots of misinformation out there. Anyway, it should be a 250 unless it's been swapped out for a car engine (AFAIK you couldn't get a 250 in a truck in '66, and it would be a special order item if you even could).

Re: In need of engine decoder help!
 

So I'm going to say it is a 250 then. Thank you for the help, I'm still new to this and I'm trying to make sure everything's perfect before it goes in storage.

Re: In need of engine decoder help!
 

To do this right, look just to the left of the distributor on the machined surface. Clean it off and tell me all the numbers and letters that are stamped there. This will positively ID what it is

Re: In need of engine decoder help!
 

Do you have a list of the engine codes for inline sixes? I've looked and can't find anything online.

Re: In need of engine decoder help!
 

Yes, I have all the books to cover trucks.

Re: In need of engine decoder help!
 

If you don't mind look at mine also.. I know what the first few mean but not the last 2 letters. F0303UH

Re: In need of engine decoder help!
 

Neat. I'll have to send you a couple #'s when I get them down.

Any chance you'd want to scan them (or take some pictures or something) for the greater good when you get the chance? AFAIK there aren't really any lists of the I-6 numbers available online now.

Re: In need of engine decoder help!
 

Hi Randy ! The UH suffix was used from 1965-1969 on 292s . If you give me the casting date, I can tell you the day and month AND year your engine was assembled . Your F0303UH . The F is for Flint, the first 03 is the month, the second 03 is the day. So third month=March 03 or March third day of ?year? The year would be determined by the casting date. Hope this helps. Jon

Re: In need of engine decoder help!
 

Ok Thanks. I have 2 292's and one has the bigger plug and the other has smaller plugs. Yea I wasn't sure what the UH meant if anything.

Re: In need of engine decoder help!
 

UH basically means its a 292 with manual trans. Some codes are more specific. . Your small plug 292, whats the code on that ?

Re: In need of engine decoder help!
 

Alright I cleaned off the plate and hopefully this issue can be resolved. I have CON2 E36

Re: In need of engine decoder help!
 

;)
http://67-72chevytrucks.com/vboard/s...d.php?t=382583
;)
http://67-72chevytrucks.com/vboard/s...d.php?t=356268

Re: In need of engine decoder help!
 

Those numbers are "CASTING" numbers, I need the "STAMPED" numbers right next to the distributor in this location.
http://i270.photobucket.com/albums/j...41F057052D.jpg
http://i270.photobucket.com/albums/j...B9B570E660.jpg

Re: In need of engine decoder help!
 

Alright I got it this time the STAMPED number is F0506TA

Re: In need of engine decoder help!
 

Perfect ! TA suffix is used for 1965 for a 230 six and 1966-1968 on 250 six with manual trans in truck only with that suffix. Now if you can find the casting date we can tell what year. It will read like H 6 5 or A 12 6 just as examples and be about 1/8 to 3/16 tall CASTING letters and numbers . More than likely a 250 if its the original engine to your 1966 truck. Strange how they repeated the TA suffix for both 230 and 250, that's not to common. There wasn't a 250 till 1966.

Re: In need of engine decoder help!
 

He said it was E 3 6, so that confirms it as a '66 250.

Re: In need of engine decoder help!
 

Ok, didn't read that. It falls perfect then. 1966 250. Find the thread of yelmers and he can tell you what month this body 1966 was built. He started a list of all the 66s we have on here.