Help with GM cam timing events?specs,
 

Hi, can anyone tell me the intake/exhaust valve opening/closing specs, or where to find them for these two GM cams:
#12552296 L-29 and

#24502611 454HO

Thanks Scott

Re: Help with GM cam timing events?specs,
 

on the #12552296 duration @ .050 intake is 204 degrees with .480 lift and exhaust is 209 degrees with .483 exhaust

Re: Help with GM cam timing events?specs,
 

On the 24502611 @.050 intake duration is 211 with .511 lift and exhaust duration is 230 with .540 lift. It has a lobe sep angle of 110 degrees. I believe this is a gen6 roller cam

Re: Help with GM cam timing events?specs,
 

They are both Gen VI roller cams.
What engine are you planning to run one in?
I have run them both in my 454 with oval port heads, not much difference between the two.
I guess the HO cam is designed more for the rectangular port heads

Re: Help with GM cam timing events?specs,
 

Cam # 24502611
@ 0.050
ID 211
ED 230
LSA 112
ICL 108


IVO -2.5 BTDC (- indicates ATDC)
IVC 33.5 ABDC
EVO 51 BBDC
EVC -1 ATDC (- indicates BTDC)
ECL 116
Overlap -3.5

Re: Help with GM cam timing events?specs,
 

Cam # 12552296 listed
@ 0.050
ID 204
ED 209
LSA 118
ICL 115.5


IVO -13.5 BTDC (- indicates ATDC)
IVC 37.5 ABDC
EVO 45 BBDC
EVC -16 ATDC (- indicates BTDC)
ECL 120.5
Overlap -29.5

Re: Help with GM cam timing events?specs,
 

Cam # 12552296 measured
@ 0.050
ID 206
ED 211
LSA 118
ICL 115.5


IVO -12.5 BTDC (- indicates ATDC)
IVC 38.5 ABDC
EVO 46 BBDC
EVC -15 ATDC (- indicates BTDC)
ECL 120.5
Overlap -27.5

Re: Help with GM cam timing events?specs,
 

Thanks, just what I was looking for. Also does anyone have a used or takeout gm #24502611 cam they want to sell?

Thanks Scott

Re: Help with GM cam timing events?specs,
 

Hey rmbuilder,
Can you break down the ZZ502 cam like that for us?
I'd like to plug it into desk to dyno.
Thanks

Re: Help with GM cam timing events?specs,
 

Pat,
Cam # 12366543 measured
@ 0.050
ID 224
ED 234
LSA 110
ICL 108


IVO 4 BTDC (- indicates ATDC)
IVC 40 ABDC
EVO 49 BBDC
EVC 5 ATDC (- indicates BTDC)
ECL 112
Overlap 9