1970 deuce

[COPO 70 RS/Z28]

I think there was also a more restrictive exhaust on the z also

[Mr70]

There was and it started with the Ex.Manifolds.

[ QUOTE ]
Sam
I've always understood the difference between the two was their gross horse power,do to different exhaust manifolds & notated with seperate suffix codes.
1970 Corvette LT-1 350/370HP coded CTU/CTV used Ex.Man. LH-3872765 & RH-3932461.
1970 Camaro LT-1 350/360HP coded CTB/CTC used Ex.Man. LH-3942527 & RH-3946826.

[/ QUOTE ]

I also have an inhouse 1970 Chevrolet Technicians Diagnostics Specifications Catalog dated February 1970,that shows individual engine outputs and peak levels.
The Corvette LT-1 clearly shows 370HP @6000RPM w/peak torque of 380 @4000RPM while the Camaro LT-1 shows 360HP @6000RPM w/peak torque of 380 @4000RPM.

[COPO 70 RS/Z28]

So was the deuce running standard exhaust etc. or were they running open element & performance exhaust

Also were all the deuce motors close in build date or did they very dramatically???

[Schonyenko2]

[ QUOTE ]
So was the deuce running standard exhaust etc. or were they running open element & performance exhaust

Also were all the deuce motors close in build date or did they very dramatically???

[/ QUOTE ]

Deuces ran the Z dual snorkle air cleaner, and a stock exhaust system with the Z manifolds.
The build dates were usually very close.

My comment on the L79 Chevy11's comes from the urban legends back in the day, that those little box deuces that slid up beside you late at night, and blew your door off were somehow ordered, or transplanted with corvette motors. Remember, Bill Thomas started doing that with some of the 1st gen Chevy 11's.So there was a lot of rumor about factory, vrs transplant.
Don was a SCCA racer. Way more into Corvettes than Z's. Plus why buy a nova with a Z motor, when you could just by the Z. Cheaper. Marlin also has a theory that Don built the deuces with an eye on possible trans Am racing. Hence the suspension COPO. And if you take the stripes and flip them around, they look like Boss 302 stripes. Sorta.

[Salvatore]

Wouldn't the Deuce manifolds be the same as the SS 350/300 novas for 1970? I also can't believe that there were much if any restriction differences from the 70 Z/28 manifolds and the LT-1 corvette manifolds. Same size but a little different shape to fit the frame? Dollars to donuts GM did not design a better flowing exhaust manifold for the corvette just to say it has 10 more hp. They gave it 10 horsepower to put it tops in its class. Its called advertising.

[Mr70]

The 350/300Hp Novas used the same design manifold as the Deuce,only it wasn't drilled for A.I.R. so reflected a different casting #.Used on SB in the 69 model year as well.
The 370HP LT-1 Corvette used a center straight out exit manifold,while the 360HP LT-1 Z/28 Camaro-Deuce used a rear out exit.
Twinkies to Tastykakes..