Converting LA 360 to roller cam

Infecteddog said

I wanted to keep the lift low- swapped over to stud-mount roller rockers but retained the 1.6 stock rocker ratio. I didn't see anything at 215-216 @ .05 in the final runners up on both, I didn't want the duration so low on the intake that the 'rango's 5.2 cam would be about as good with 1.7s. 213/219 and 221/225 were the ones I came down to. About all of them I've seen in shelf cams have a pretty steep split like that. Because of being a 408 I don't want the duration to be too low even though it's just around 8.8:1.

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The factory 5.2 cam is only about [email protected] so going to 1.7 would be no where close. The lift is only .439" on 5.2 factory. The problem is that most of those box grinds are based on GM engines or at best LA type cylinder heads with weak exhaust port/valve from 20+ years ago if not the 70's. They are not designed for strokers either meaning you are leaving a lot of power on the table. Without a proper flash, you are leaving a lot of power on the table too....both those combined together could easily cost you 75+ HP, maybe more. You need a custom grind and flash plus some larger injectors and throttle body. Then save up for some 1.97 intake valves and a bowl hog but I would step up from factory heads before I spent anything more than a valve job on stockers due to cracking.