Your donations help keep this valuable resource free and growing. Thank you.
|
Type I, Type II and Group 19 camshaft |
Post Reply | Page <1234 5> |
Author | |||
Steve_P
AMC Addicted Charter Member Joined: Jun/28/2007 Status: Offline Points: 3805 |
Post Options
Thanks(0)
|
||
The Group 19 cam is different from the Crane Fireball cam. The duration and lift are the same, but the timing is different. I made this mistake years ago just looking at the lift and duration and was corrected, and when I looked at the timing I saw the difference. I have a NOS 68, 70 type 1, 70 type 2 cam and will someday get the specs on them and compare the .005 and .050 duration and lift profiles |
|||
purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16611 |
Post Options
Thanks(0)
|
||
|
|||
SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5476 |
Post Options
Thanks(1)
|
||
More cool drawings. Edited by SC397 - Jul/30/2020 at 12:58pm |
|||
Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7949 |
Post Options
Thanks(0)
|
||
My guess on open/close numbers at .050 are: Type 1 IO: -(11) IC: 27 EO: 31 EC: -(15) Type 2 (if it is same as 401) IO: -(7) IC: 34 EO: 42 EC: -(14)
Edited by Sonic Silver - Jul/30/2020 at 2:20pm |
|||
SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5476 |
Post Options
Thanks(0)
|
||
Reference material. The WG1115 is the stock cam. Not sure if it is 100% exact but I used the WG992 as the Group 19 cam.
|
|||
WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5799 |
Post Options
Thanks(0)
|
||
I meant to post this up yesterday with the parts catalog listing:
|
|||
I've finally given up drinking for good...........now I only drink for evil.
|
|||
Steve_P
AMC Addicted Charter Member Joined: Jun/28/2007 Status: Offline Points: 3805 |
Post Options
Thanks(0)
|
||
D'oh! You're right on the 68 and 70 type 1 being the same- brain fade on that one. I have a NOS 68, NOS 70 type 2, and also a used 401 cam as a future comparison project. But it looks like the pictures above take care of the 68-70E cam. Thanks for posting that! |
|||
ccowx
AMC Addicted Joined: Nov/03/2010 Location: Yukon Status: Offline Points: 3510 |
Post Options
Thanks(0)
|
||
The Blue Racer '992 is extremely close, but not quite the same. The Group 19 cam was installed slightly retarded while the '992 looks to be straight up. Other measurements such as duration at .050 and lobe centers are probably slightly off too.
Chris
|
|||
Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6881 |
Post Options
Thanks(0)
|
||
Edited by Trader - Jul/31/2020 at 3:54pm |
|||
ccowx
AMC Addicted Joined: Nov/03/2010 Location: Yukon Status: Offline Points: 3510 |
Post Options
Thanks(0)
|
||
The first one is the factory spec sheet for the Group 19 cam and the other one seems to be the AMA specs as issued right around the changeover from the Type 1 to the Type 2 cam in the 390 in fall of 1969.
Chris
|
|||
Post Reply | Page <1234 5> |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |