mustang 5/8 s-plugs

[davewave]

bought a 1966 gt coupe with 389 hipo, did not check engine #'s, went to check plugs they are 5/8 in", can this be a 289?

 

[davewave]

sorry

meant 289 hipo

 

[danny clemens]

Only if the heads aren't original. You probably have a later model 302. Is this a K code car or just a modified one that somebody calls a hipo?

 

[davewave]

5/8 plugs

Danny, how can I tell if k-code, it's a 4 speed coupe that is soooo fast, to fast, all new black interior and painted 2005 stang yellow. it may not be an original hipo, but in my teen years my freind had a 66 shelby fastback, this coupe will smoke it. I got a great deal on it, so I probably was lied to. wheres the #s on block?

 

[tim95gt]

k code would be in the vin to designate the original engine in the car. The numbers on the block would be behind the starter, but could pull a valve cover and check the heads for numbers as well

 

[danny clemens]

The fifth digit in the vin is the engine code. The K codes are a whole lot rarer than the other cars.

K-289 high performance
A-289 4 bbl
C-289 2 bbl
T-200 6 cylinder

 

[JonK]

Here's a pic of where you find the casting number and casting date on most blocks through ~'90 I believe:

Rear right corner of the block as viewed from underneath, have to remove the starter as mentioned. If you crawl under there bring some rags, spray gunk and a tooth brush (I used the wife's) as it'll be covered with muck. Post the number and we can decipher. The casting date is the upper number/letters.
Jon