This lift is getting to the max so you need to check if your heads will go that far, most will.Īnother good choice especially if you don't want a rough idle or need more vacuum for brakes than the 109 LSA cam is the GM 12551142 which specs 203/210 duration with lifts of. This cam likes a 1.6 rocker on the intake which moves the lift to. This cam has a lopy idle because of the tight LSA, for a fairly modest duration so it sounds meaner than it is. 431/.451 inch lift with 1.5 rockers with an LSA of 109 degrees. GM 14097395 used on several crate motors is 196/206 degrees at.

412/.412 inch lift with 1.5 rockers with an LSA of 111 degrees. So if all you want to do is slide the old cam out and the new one in you're limited to things like the cam that is in the 元1 which is quite similar to the old 300 horse cam but ground for roller lifters it uses at. Click to expand.If you don't want to modify the valve guides for higher lift or change the springs to beehives you are limited to lifts around.