CRG Discussion Forum
Welcome, Guest. Please login or register.
Did you miss your activation email?
August 20, 2014, 11:24:31 PM

Login with username, password and session length
Search:     Advanced search
Welcome to the CRG Discussion Forum!
Forum registration problems: Make sure you enter your email correctly and you check your spam box first. *Then* email KurtS2@gmail for help.
103299 Posts in 12153 Topics by 4689 Members
Latest Member: merle
* Home Help Search Login Register
+  CRG Discussion Forum
|-+  Camaro Research Group Discussion
| |-+  Decoding/Numbers
| | |-+  Cam Options?
« previous next »
Pages: [1] 2  All Print
Author Topic: Cam Options?  (Read 7792 times)
DEEJAY
Newbie
*
Posts: 14


View Profile
« on: December 30, 2006, 11:34:13 AM »

I was told recently By previous owner of my car that there were 2 different cams
available in 1969 302 (street & offroad).Is there any truth to this?
2nd question....I pulled valve pan off passenger side of my 302 and found a couple
of casting #s(464669 &464670).Since I have a CEB block I wondered if these numbers
would help with proper identification?
Logged
sam
Member
***
Posts: 232


View Profile Email
« Reply #1 on: December 30, 2006, 12:08:54 PM »

I don't believe that the off road cam was available other than over the counter.
Logged
GaryL
Hero Member
*****
Posts: 538


Marilyn and me

gandmal
View Profile Email
« Reply #2 on: December 30, 2006, 10:34:46 PM »

Remember, the 302 was built as a race engine from the factory. All the parts needed to be factory and available to qualify for Trans Am racing.

Per John Z as posted over at Team Camaro:

Standard 302 (30-30) cam, P/N 3849346
Casting #3849347
254 duration @ .050" (intake & exhaust)
.485" lift (with 1.5 rockers)
114 deg. lobe separation
Exhaust Max lift @ 116 deg. BTDC
Intake Max lift @ 112 deg. ATDC

First Design Off-Road cam, P/N 3927140
Casting #3927141
Intake 257 duration @ .050" (333 advertised)
Exh. 269 duration @ .050" (346 advertised)
Lift: .493" intake, .512" exhaust
Intake Max lift @ 108 deg. ATDC
Exhaust Max lift @ 116 deg. BTDC

2nd Design Off-Road cam, P/N 3965754
Casting #3965751
Intake 248 duration (324 advertised)
Exh. 267 duration (334 advertised)
Lift: .512" intake, .535" exhaust

(Thanks to Mark C.)

------------------
JohnZ

DEEJAY, are you saying the casting numbers are the heads? The casting numbers should end in 186 for a 1969 302 engine. And are you saying the engine assembly date suffix is CEB? Should be DZ.
« Last Edit: December 30, 2006, 10:44:30 PM by GaryL » Logged

Gary

Lemans Blue X33. DZ, M20, manual steering. Only BU code rear end is original.
Jerry@CHP
CRG Member
*****
Posts: 1445



View Profile Email
« Reply #3 on: December 30, 2006, 11:43:22 PM »

All of the factory built 302's that were installed in Z28s received the "346" camshaft.  There were actually two upgrade versions, but they had to be purchsed over the counter.

Jerry
Logged
RamAirDave
Member
***
Posts: 334


RamAirDave
View Profile WWW Email
« Reply #4 on: December 31, 2006, 01:39:10 AM »

I think I found the same post last night in which you quoted, Gary.

I was doing some searching on TC about it since the Z Im finishing now has an NOS 140 cam in it.  Probably no good for regular driving, but has a wicked sound at idle, especially through the Gardner Smiley
Logged

"Build them how the designers and engineers envisioned them to be"

www.TheMuscleCarGuys.com
hotrod68
Hero Member
*****
Posts: 520


almost finished

rusticman48@aol
View Profile Email
« Reply #5 on: December 31, 2006, 01:39:10 AM »

The "30-30" solid cam was factory. The "140" cam was over-the-counter and a lot more radical, and it sounded TOUGH. There was the 2nd-design 140 cam that Gary posted. That's what we called 'em.
Logged

HotRod'68  1968 SS350 coupe undergoing frame-off resto/rod. 386/350/4.11s
Butternut Yellow    black standard interior
Jerry@CHP
CRG Member
*****
Posts: 1445



View Profile Email
« Reply #6 on: December 31, 2006, 11:22:29 AM »

Sometimes you can get the same sound out of the 346 cam if you tighten the valves down to about .022".  What we've found in our dyno testing research is that you lose cylinder pressure when installing a higher lift camshaft such as the 140 so there are trade offs.  Bigger is not necessarily better all the time.  The 140 uses a lot of fuel on the street too.

Jerry     
Logged
JohnZ
CRG Member
*****
Posts: 4066


View Profile Email
« Reply #7 on: December 31, 2006, 11:22:41 AM »

In order to identify your engine, we need:

Block casting number on driver's side rear flange
Block casting date code on pass. side rear flange
Stampings on the machined pad in front of the pass. side cylinder head

I don't recognize the 464669 and 464670 numbers - the head casting numbers and casting dates should be centered on the heads, and the format will look like the photo below (Corvette head, not Camaro):

Logged

'69 Z/28
Fathom Green
CRG
GaryL
Hero Member
*****
Posts: 538


Marilyn and me

gandmal
View Profile Email
« Reply #8 on: December 31, 2006, 02:55:13 PM »

I think I found the same post last night in which you quoted, Gary.

I was doing some searching on TC about it since the Z Im finishing now has an NOS 140 cam in it.  Probably no good for regular driving, but has a wicked sound at idle, especially through the Gardner Smiley

Been following that one. How did you get 800 rpm idle? With full manifold vacuum advance I can not get that low because the vacuum drops and I lose the advance. Any chance of getting a sound clip?

I am changing my repro chambered system for the transverse system. I think it should sound a little crisper.
« Last Edit: December 31, 2006, 03:08:15 PM by GaryL » Logged

Gary

Lemans Blue X33. DZ, M20, manual steering. Only BU code rear end is original.
DEEJAY
Newbie
*
Posts: 14


View Profile
« Reply #9 on: December 31, 2006, 03:28:03 PM »

Head casting # is399492(inverted)
Block casting (driver rear)  3970010
Block casting date (passenger rear)  D241
Front machined head pad   CEB1244
The 464669 numbers I gave are on the interior upper section of the factory alum. valvepans.
       Thanks for replys
Logged
DEEJAY
Newbie
*
Posts: 14


View Profile
« Reply #10 on: December 31, 2006, 03:30:39 PM »

Oh and by the way engine idles at 1300rpm.SWEET!
Logged
Jerry@CHP
CRG Member
*****
Posts: 1445



View Profile Email
« Reply #11 on: December 31, 2006, 07:30:08 PM »

Once the distrubutor is set up with a short curve and light spring set on a Sun distrubutor machine, you're good to go.  Read the customer feedback on distributors on my website, www.z28camaro.com.

Jerry
Logged
RamAirDave
Member
***
Posts: 334


RamAirDave
View Profile WWW Email
« Reply #12 on: January 01, 2007, 01:25:19 AM »

Been following that one. How did you get 800 rpm idle? With full manifold vacuum advance I can not get that low because the vacuum drops and I lose the advance. Any chance of getting a sound clip?

Good question...

When I was dealing with the idle/timing issue, I was able to get it settled in in the 800s according to the timing light.  I dont know exactly where its at right now, but doesnt sound to be too far away from that.

Considering that it doesnt feel like the brakes are getting much vac assist at idle, I would doubt that the vac advance (connected to the port on the carb base) is doing too much either.  Then again, I dont think it should be doing much, if anything, at that rpm anyway.

Idle sounds good, total timing is at 34*, so I figure I'll just leave well enough alone for now.

For a sound clip, I'll try to work something out.  It will have to be a short vid clip.  I'll see what I can do.
« Last Edit: January 01, 2007, 01:27:42 AM by RamAirDave » Logged

"Build them how the designers and engineers envisioned them to be"

www.TheMuscleCarGuys.com
GaryL
Hero Member
*****
Posts: 538


Marilyn and me

gandmal
View Profile Email
« Reply #13 on: January 01, 2007, 12:52:06 PM »

This is what I did.

http://www.camaros.net/showroom/showphoto.php?photo=1204&cat=500&ppuser=11189
Logged

Gary

Lemans Blue X33. DZ, M20, manual steering. Only BU code rear end is original.
RamAirDave
Member
***
Posts: 334


RamAirDave
View Profile WWW Email
« Reply #14 on: January 01, 2007, 01:27:23 PM »

Here's a 10 sec idle clip.  Timing light was showing around 750RPM.


http://s20.photobucket.com/albums/b217/RamAirDave/GoldZ/?action=view&current=GoldZIdle.flv
Logged

"Build them how the designers and engineers envisioned them to be"

www.TheMuscleCarGuys.com
Pages: [1] 2  All Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!
Page created in 0.075 seconds with 17 queries.