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Original Message
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| X code versus S code |
| By Royce Peterson - 12/28/2001 6:21:52 PM; IP 152.163.195.204 |
The "X" code 390 2V was available only in 1968 Cougars and Mustangs. They are rare but not particularly desirable compared to the "S" code 390-4V. These engines are largely the same except:
1. All the "S" code engines recieved Thermactor smog. That's right, all 50 states and Canada.
2. The intake and carb are obviously different.
3. The cam in the "X" code is a real snoozer. The GT cam is a little better but still a taxicab grind compared to anything else made then or now.
4. Head castings are C8AE-H on both engines. The "X" code heads weren't drilled for smog, the "S" code heads were.
5. Exhaust manifolds, blocks, cranks, pistons and anything else fundamental to the engine are all the same.
Recommendations:
1. Install a better cam and lifter set. Comp Cams 268H is a great all around cam to match the C6 auto that is behind every "X" engine.
2. Install an aluminum intake. The Edelbrock Performer matches the small intake ports on those H heads nicely and takes 60 pounds off the nose. Either a Holley or Edelbrock 750 CFM carb works nicely.
People at car shows might disagree about smog installation on 1968 390GT's but the FOMOCO literature does not list a non smog 390GT engine for 1968 model year. There were 390-4V engines in full size Fords and Mercurys with Autolite carbs and no Thermactor but those were not S-Code GT's.
Enjoy!
Royce Peterson |
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