I was looking for a new replacement Y pipe for my 305 crossfire injection 83z, but all I can find is a replacement for H code engines. I looked in my factory service manual and all they show for v-8 exhaust is the H code configuation. What's the difference? I was trying to avoid the expense of headers and a complete system, but it seems I may be forced into it. I even called the local dealer for the replacement and they couldn't help me either.

 

Vin code S is for a V6.

 

Unless i'm mistaken the S code engine is the same as RPO LU5, which is 5.0L V8 EFE. The source of my info is GM dealer, as well as my factory shop manual.

 

my old 87 firebird had the V6 in it and i'm pretty sure the engine code was S.

 

What I have is an 1983 Z28 with crossfire injected 305. The dealer I called said this was the H.O. option for 1983. vin code 1G1AP87S4DNxxxxxx. Thanks!

 

I used the vin decoder on this site and got these results:

Here are the results for your query on: 1G1AP87S4DNXXXXXX
Made in: United States
Manufacturer: General Motors
Make: Chevrolet
Restraint System: Manual belts
Carline Series: Sport Coupe, Z28
Body Type: 2 door coupe
Engine Code: 305 ci V8 LU5 (1983)
4 is the CHECK DIGIT.
Model Year: 1983
Assembly Plant: Norwood

 

In 1982 and 1983 the vin code S was used for the 305 dual fuel injected "Crossfire" engines. Later on during the 3rd gen run, the vin code S was used for 6 cyl engines. What I have been told is the exhaust manifold for the Crossfire is the same as the 305 non-H.O. (I forget the vin code - H?).
My personal opininon - get aftermarket. The factory "Y" pipe is shaped like a "T" with a 90 degree pipe entry...
Rob

 

what dose the letter h stand for in 82 - 83 thein

 

The H engine code denotes the 4 bbl carb.

 

My last post wasn't quite correct...
In 1982 the V-8 Crossfire engine was vin code "7" while in 1983 it was "S". In 1986, 87, 88 the "S" code was used for the V-6, and in 1989 the ''7" was used for the V-6. Somebody at GM must'a been bored... ;-)
Rob