-Chevrolet
-'96 Silverado K1500
-4WD
-5.7L Vortec
-Ext cab

Just want to run my96' 1500 5.7 vortec build by some more experienced people before I commit to anything.

I Plan on running a zz4 cam, just looking for a "mild" performance improvement over stock.
Duration @ 0.050" Lift: 208/221
Lift: .474"/.510"
Lobe Separation: 112
w/ 1.5 rocker I believe

to accommodate the higher lift I was going with Competition Cams 26915 Beehive Valve Spring and 787 Steel Retainers to work around having to machine for clearance.
I'm going to have press in rocker arm studs replaced with Mr. Gasket 1076 Screw-In Rocker Arm Studs and pushrod holes drilled out to 1/2" which i'm not sure is necessary if i choose to stick with 1.5 rockers.

I need to figure out the total lift with 1.6 rockers to see if I would still be within lift constraints. I've already planned on purchasing roller rockers, I'll be well with in lift limits with 1.5 rockers. If i can in fact get away with 1.6 rockers would it be worth while? The spring retainer combo allows lift up to 0.550 inch on the Vortec heads.

between the increase lift and switching to roller rockers I'm already going to measure for pushrod length and I know that the geometry will definitely change running 1.6 rocker, how drastic is the change in pushrod length, if any if i stick with 1.5 rockers?

Did the math...so with 1.6 rocker total lift will be .505/.544 which would be cutting it close. .006" retainer to seal clearance, too close maybe? what is a desirable clearance for that? Pretty much would it be worth having the guides machined down to run 1.6 rockers?

Does anyone know how the PCM will fare with the 112 lobe separation?


Going to have my PCM tuned by PCM4less.

Just looking for a 2nd opinion or some insight. any advice would be greatly appreciated!

 

You are cutting it close with the 1.6 rockers, too close for my comfort .006 if really thin.

I don't know how the PCM will like the 112 lsa but with a custom tune it can be tweaked to dial it in.