Question for Dave69x33

[Cleaner1]

I am trying to find out if Dave was the owner of 1969 Z/28, Vin#124379N641649 Production Date05/08/1969. I was looking at some of the comments as roller rockers added to the car since it was not the original DZ block. I have the car now. Thanking you in advance.

[z28z11]

Out of curiosity, did you get an answer ? Sending a PM might get you a response.


https://classiccars.com/listings/view/1427454/1969-chevrolet-camaro-z28-for-sale-in-springfield-ohio-45503

This the car (according to the VIN, yes) ? I noted the dealer indicated “proper DZ stamping”. A pretty LeMans car nonetheless -

Regards,
Steve

[Dave69x33]

Hello Cleaner 1,

This is Dave R (CRG Dave69x33).  I have a Norwood build '69 05A RS Z28, LeMans Blue VIN 9N638712.  The 302 DZ in my car is not the original engine. I assume it was replaced out of warranty back in 1971 with a replacement DZ. My Z28 has the original April date coded "BV" 4:10 rear gear and had a portion of a trailer hitch remained on the car when I purchased it in November 1995 to restore.  The replacement water pump and distributor on the motor were both dated 1971 which led me to the speculation what happened to the original DZ 302.  There is no evidence of rust in the rear sheet metal as you might expect if someone as launching a boat. I speculate a prior (original owner?) use the Z28 to tow a drag car to races back in the day.

Because my 302 is not the original engine, I had a local engine builder with extensive experience with cylinder head design and porting (he helped design the Hemi pro-stock heads when he worked for Jegs race team), upgrade my heads with bowl porting and clean up behind the valves, and convert to screw-in studs and guide plates for a Comp Cams full roller cam shaft.  The goal was to gain better power utilization at bit lower in the RPM curve vs. the stock "30-30" cam which has a power band that does not come in until 3000+ RPM.  With a full roller cam, the exhaust lift ramp is comparatively more aggressive, and the overlap specs help my otherwise stock cylinder heads and stock exhaust system flow better and expel exhaust more efficiently.  I really enjoy the power band and overall engine responsiveness with this cam and retained the stock sound of the original solid lifter cam.   If my Z28 was a "numbers matching" Camaro, I would have selected a stock grind spec cam.

When I return home I can let you know the cam specs and part number and include pictures of the rocker arm setup.  I should also note that I had to use extra thick valve cover gaskets and have the poly-lock rocker arm nuts milled down to make sure I had proper “hot engine” clearance with the stock valve covers. One other area that needed to be addresses was a cam button and flex of the stock sheet metal timing chain cover which are unique to the DZ 302. I wanted to retain a very stock looking engine and my original timing chain cover and devised a work-around to address the cam shaft float within the engine due to the forward thrust from the distributor drive gear.

[Stingr69]

I think he has a Comp 12-770-8, 274/280, 564/570, 110 LSA   

[Dave69x33]

Stinger69 hit the nail on the head!  That is my cam.

It was back in 2011 when I build my motor. I am pulling together the specs and info on the build and will share it with you!

In the mean time, if you search YouTube for "Soundbite of 1969 Z28 Camaro with Comp Cams XR274R Cam No. 12-770-8," by Dave69x33, you can here the cam profile sound in a 302 with stock exhaust. 

This is the info included with the YouTube post:

"Stock Z28 "DZ" 302 cu. in. motor with upgraded valve train including Comp Cam's solid roller cam 12-770-8, springs, lifters, push rods, cam button, and #1804-16, 1.5 ratio Ultra Pro Magnum Roller Rocker Arms. Initial timing set at 12 deg. BTDC, idle speed between 900 - 950 RPM. Results: Very responsive and reliable power from 2200 to 6200 RPM. Soundbite is through stock exhaust manifolds and exhaust system with the transverse muffler, and without resonators."

BTW...I run 93 octane full and AC R45 plugs with no issues.   

Dave

[Stingr69]

Idle vacuum was ?

[Dave69x33]

It has been a while since I checked it (as I get older I can't remember details like I once could).  . If I recall correctly my motor idles at about 9 - 10 in of vacuum.