1969 Z exhaust and smog systems

[69Z28]

Hey William or anyone here, what is the O.D. of the head pipes for the Z28's? Were they 2" or 2.25"?

[JohnZ]

Hey William or anyone here, what is the O.D. of the head pipes for the Z28's? Were they 2" or 2.25"?

They were 2-1/4".

[Jerry@CHP]

The famous '68 Z28 ad that was in about every magazine back in the day also states 2 1/4" diameter pipes with deep tone muffler.

[william]

Whatever system your car had new it wasn't very good. Worst of the bunch was probably NC8, chambered. 4 mufflers, small diameter tubing, lots of bends. On a ZL1 dyno test many years ago a stock engine with headers picked up 80 hp when the system was disconnected.

I read somewhere the '65-'69 Corvette side-mount system [chambered also] was about a 50 hp hit on a BB.

[69Z28-RS]

I read somewhere the '65-'69 Corvette side-mount system [chambered also] was about a 50 hp hit on a BB.

I think I recall JohnZ saying that chambered on a Z28 had about a 7 hp impact compared to the transverse muffler system.
Note:  '65-'67 Corvette side pipes were of a similar chambered design. The 68 Corvette did not offer a sidepipe option.  The '69 Corvette sidepipe system (single year offer) was not of the same chambered design.

[janobyte]

I've still got the factory exhaust off my z if anybody wants detailed pics, Already posted some a few months ago on a thread looking for muffler #s.

[davoutdog]

Danny, here are some numbers:
Cowl Tag
ST69 12437    NOR234070BDY   
TR711            72 72PNT
01E                X33
Transmission      19N530287   P9A09B
The Vin is 124379N590287
The block MFG Date is A239  and  the casting is 956618
The front number looks to have some very faint small numbers and after a gap has larger that read   V0130DZ
There is the possibility that we misread a digit or two but we had 2 of us to reduce the chance of that.

[Pacecarjeff]

Before you spend any money for Gardner's VERY VERY EXPENSIVE exhaust system.
read this ---> http://www.camaros.net/forums/showthread.php?t=168582 the trouble started on page 3.

Have you looked at the systems from D&R - A great system at a great price. www.drclassic.com
Every bit as original for 1/3rd the price.

if you really need stainless, then try these guys ---> www.waldronexhaust.com