CamQuest likes the XR274R (236/
[email protected];0.564/0.570) 552HP@6000, 524 ft-lbs@5000.
Or the XR280R (242/
[email protected];0.570/0.576) 554HP@6500, 520 ft-lbs@5000.
You know about OU812's retrofit roller lifters? No block machining required, they say.
CamQuest shows your current setup as...