ultradyne 257/267 cam specs? [Archive] - Chevelle Tech

: ultradyne 257/267 cam specs?


BruteSBC
Dec 17th, 03, 6:36 PM
can someone give me the cam specs for this cam, or the cam thats abit higher numbers than that?

its for an SBC, sorry
as soon as ya can...thanks


i need it for my desktop dyno

UDHarold
Dec 17th, 03, 9:32 PM
The SB287/297R7-----
.020----------------287/297
.050----------------257/267
.200----------------180/188
lobe lift----------.430/.430
valve lift---------.645/.645
valve lash---------.020/.020
LSA------------------107
ICL------------------101
timing at .020---IVO 41° BTDC IVC 66° ABDC
EVO 79° BBDC EVC 38° ATDC

timing at .050---IVO 26° BTDC IVC 51° ABDC
EVO 65° BBDC EVC 22° ATDC

In November of this year, I received a dyno test of the 410 SBC that had just won the Missouri State Fair Championship. One 850 on gas, 6.128 Rod, 13.8:1 CR, 18° heads. This cam was the SB291/301R8, the SB287/297R7's big brother, exactly 4° bigger on int and exh.
4300----515 tor/422 BHP
4500----544 /466
5000----576 /548
5200----587 /581
5500----581 /609
6000----573 /654
6500----546 /675
6800----528 /684
7000----513 /683
This was in the 600 rpm/sec mode....
All the profiles in this family, the MSP III, have been very well received, making wide bands of torque and BHP....

UDHarold