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Upgrade to 17l roller rockers on 1999 57l Mag MPI

C

cakley

New member
Is there enough valve clearanc

Is there enough valve clearance to handle the increased lift with 1.7 roller rockers.

.030 increase in valve lift is
 
valve clearance isn't a pr

valve clearance isn't a problem but spring compression and PSI of the springs can be and can cause pushrod failure. I suggest some searching on Google for 1.7 rocker 350 GM /Chevy etc.. see what you find.

Also changing things like that with an engine with a ECM/Computer means you'll need to reprogram to fully take advantage as now it will want more fuel.

You may want to go talk to a local HP engine builder too..
 
"oh.. forgot that I used a set

"oh.. forgot that I used a set of the Crane Roller TIPped Rockers (1.65:1) on my HP 350 V8.. I think they were good for upto 20-40hp I think.. also I used 1010 Steel Pushrods, but ones for Roller Lifters like yours are a different lenght.

Roller tips help reduce some of the friction and will reduce wear on the valve guide as the rocker moves it wont push/pull the valve sideways."
 
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