horrorbiz78

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

jimjomack

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

jimjomack

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

Pat McPherson

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

rmbuilder

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

rmbuilder

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

rmbuilder

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

horrorbiz78

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

Thanks Scott

Pat McPherson

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

rmbuilder

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