Decoding a Camshaft - Team Camaro Tech
Tech 2000 Our previous General Forum
Replies ONLY - no new topics.

LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old Dec 29th, 00, 06:17 AM Thread Starter
Tech Team
Join Date: Jan 2000
Location: Forest City, Iowa
Posts: 67

What number is cast into the casting area in between the lobes of the cam for a 69 302(DZ)? I'm trying to id the orrg cam, but I've got several to choose from. Also, what are the specs on the cams that came from the factory?
I know the decoding is a little strange, but if anyone has info, I'd sure appreciate it.

1969 Z28
LeMans Blue-White Stripes
#'s matching, P-O-P
shelbyz28 is offline  
Sponsored Links
post #2 of 7 (permalink) Old Dec 29th, 00, 10:24 AM
Join Date: Apr 2000
Posts: 21,341

The big Duntov "fuelie" cam is:

254/254 @ .050", 485"/485" gross lift, 114 LCA/111 ICA, (It needs .030"/.030" lash)

The factory advertised duration was like 345 or something wild because they rated it at .002" or something weird like that, but I think it's more like a 304 duration if rated at a .015" standard now a days. IMHO. pdq67

pdq67 is offline  
post #3 of 7 (permalink) Old Dec 29th, 00, 04:26 PM
Team Member
JohnZ's Avatar
Join Date: Sep 2000
Location: Washington, Michigan USA
Posts: 7,728

Don't know what the casting number is, but the finished camshaft part number is 3849346 for the 30-30 Duntov used in the Z28. Valves must be lashed hot, with the engine running with this cam (ramps are too long to set the valves accurately with the traditional shop manual method - that's why the shop manual specifically states "hot and running" for this cam).

'69 Z28 Fathom Green
JohnZ is offline  
post #4 of 7 (permalink) Old Dec 29th, 00, 06:16 PM
Join Date: Apr 2000
Posts: 21,341

Oh, Crane makes a duplicate of the old -346 fuelie cam if you want one that is identical to the original.

You can probably get one cheaper from Wolverine Blue Racer, though. pdq67

pdq67 is offline  
post #5 of 7 (permalink) Old Dec 31st, 00, 07:13 AM
Senior Tech
Join Date: Sep 1999
Location: Talking Rock, Ga. U.S.A.
Posts: 133

The casting # is usually one # past the part #, or # 3849347. That was the #'s that were on the original one I had. Bought a Chevelle convertible, and got an engine with it for $35. The engine had sat in a chicken house for years, and froze, and busted. I tore it down, and noticed it had solid lifters, so I pulled the cam, and it was a brand new G.M. solid lift 30/30 cam, still covered in assembly lube. The engine hadn't even been turned over. Sold it to a guy in town with the lifters for $125.

Many Used Parts for Chevelles, and Camaros- Just ask!
Doug Garland is offline  
post #6 of 7 (permalink) Old Dec 31st, 00, 04:23 PM
Senior Tech
Join Date: Nov 1998
Location: ohio
Posts: 252

One thing you can do is get a micrometer and check the lift. Just measure the base and the lobe sizes subtract and multiply by 1.5 to get the acutal valve lift. Get pretty close like this. Numbers I've seen for a stock 302 was for a .455 valve lift.

[This message has been edited by tom3 (edited 12-31-2000).]
tom3 is offline  
post #7 of 7 (permalink) Old Dec 31st, 00, 05:23 PM
Join Date: Apr 2000
Posts: 21,341

I'm sorry, the -346 cam is .486" lift. pdq67

pdq67 is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome