Need 75 Diverter Valve Number Clarification?

[Lyle B.]

In the NCRS Judging manual they call out a DIverter Valve for a 75 L-48 with a 7029199 with a Broadcast Code of GJ and a L-82 a number of 7030760 and DC Broadcast Code.

My car had came with 33K original and had a 7030760 Diverter valve on it. The original owner and the Chevy dealer that serviced the car said it was never touched. I have talked with several people and they say that the 7029199 is not correct for a 75 L-48.

Does anyone have any further information regarding these numbers on what trule is correct?

[Joe L.]

Re: Need 75 Diverter Valve Number Clarification?

Lyle----

You have been advised correctly regarding the diverter valve. The GM #7030760 valve was used on all 1975 Corvettes, both L-48 and L-82. I would not rule out the possibility that VERY early 1975's OF EITHER ENGINE used the 7029199, but I HIGHLY doubt it.

Strangely, although the GM #7030760 valve was once available in SERVICE and catalogued for 1976 model Corvettes, it was never catalogued in SERVICE for 1975 models. For 1975, the initial SERVICE valve was GM #7040150 and it remained so until February, 1987 when it was replaced by GM #17084023. The latter was a black plastic valve which replaced only the 7040150. It was discontinued in March, 1997.

The 7030760 valve was available in SERVICE until September, 1985 when it was replaced by GM #17084011, another black plastic valve. That valve was discontinued in June, 1999.

[Charles P.]

Re: Need 75 Diverter Valve Number Clarification?

Don't know about 1975 but the 1973 and 1974 had the same broadcast code of GJ and the diverter valve is 7039199 for the L-48. It could be like Joe says that early 75's were the same as 73 and 74.

[Joe L.]

Re: Need 75 Diverter Valve Number Clarification?

Charles-----

If any 1975 Corvettes used the 7039199 diverter valve, it would only have been VERY early cars (like, maybe the first few weeks of production). However, I strongly doubt that any did.

[Harmon C.]

Re: Need 75 Diverter Valve Number Clarification?

Lyle

The judging manual is always subject to change as few 75's have been judged. From what Joe has said I belive a change needs to be looked at.I will check my 75 which has the original pump still runing.
Lyle

[Joe L.]

Re: Need 75 Diverter Valve Number Clarification?

Lyle----

1975 also used a one-year-only AIR pump----GM #7817575. I have an NOS example of one of these pumps [not for sale] and I can tell you that it has exactly the same configuration as the 69-74 pumps. However, there must be some difference.

[Brian G.]

Re: Need 75 Diverter Valve Number Clarification?

The diverter valve on our January 16, '75 ,(approx. build date), 45K mile, L-48 is original and is 7030760 with DC broadcast code.