Crane blueprint cam lash

Allison Winn

Veteran Member
Jan 10, 2021
457
Can't seem to find the cam spec on a reliable web page. Cam card long gone - is the hot lash .022/.022" for the crane blueprint copy of the 70 Z28 solid lift cam?
 

Mitch_Z

Member
Mar 31, 2007
235
Detroit, MI
Can't help with the Crane but this is the card that came with FM CS1145R which is suppose to be the same 1970 LT-1 cam.
2022-08-27_143324 (2).jpg
 

70lt1z28

Veteran Member
Gold Member
Oct 3, 1999
4,936
Beavercreek, Ohio, USA
Here is the cam sheet. Sorry for the scribbles on it. They are the measures from when I degreed mine in. I had to advance it 2 degrees to get it right.
 

Attachments

  • Cam setup sheet with values.jpg
    Cam setup sheet with values.jpg
    224.7 KB · Views: 58

70lt1z28

Veteran Member
Gold Member
Oct 3, 1999
4,936
Beavercreek, Ohio, USA
The cam card says 330 hp motor, shouldn't it be 360?
The same cam was used in the 71 330HP, the 72 255HP, the Corvette LT-1 370HP and the 1970 360HP. I think they just picked one. It is part number 3972182 with casting number (on the GM OEM cams, and my original cam) 2182.

original cam 2182 number.jpg


A bit more about this cam here:

If you want to learn a good way to adjust the cam with stock rockers:
 

sandlapper

Veteran Member
Oct 9, 2020
1,622
SE CSA
Although I understand a desire/motivation or perhaps even some requirement? --- to replace-restore with vintage-era spec parts --- there are many other shelf grinds that would produce better street-traffic performance (lsa 116* likes relatively high revs).
 

Allison Winn

Veteran Member
Jan 10, 2021
457
Thanks all - finally got the lash properly set at .020/.025 hot and per IOEC procedure. BIG difference! Went from a struggling pig rich plug fouling eye watering run-on mess and 19" vacuum to smooth (but chattery) idle and 26" vacuum at 750 rpm.
 




Top