IVE always prefered STEEL roller rockers over ALUMINUM for two reasons
first STEEL has a MUCH GREATER fatigue life under repeat stress than aluminum, and steel generally has far fewer clearance issures with other components, plus some STEEL roller rockers are REBUILDABLE
http://store.summitracing.com/partdetail.asp?part=CCA-1302-16&autoview=sku
http://store.summitracing.com/partdetail.asp?part=CRN-11600-1&autoview=sku
in MOST cases you can install 1.6:1 roller rockers with MINOR machine work, (I have seen on rare occasions no machine work necessary)
but in any case its easily done,
the tool comes with instuctions
http://store.summitracing.com/partdetail.asp?autofilter=1&part=PRO-66485&N=700+115&autoview=sku
and before a dozen guys start telling you they installed them with zero problems on stock heads, keep in mind most guys don,t take the time to check ALL the clearances thru THE FULL rotation of the rockers arc. and it they don,t break or bind parts ,THEY assume its fine
but the truth is the pushrod should NEVER touch either end of the slot even lightly anywhere in the arc.
more info
http://www.vetteweb.com/tech/0204vet_sm ... index.html
http://www.digitalcorvettes.com/forums/showthread.php?t=82474
http://www.centuryperformance.com/valveadjustment.asp
first STEEL has a MUCH GREATER fatigue life under repeat stress than aluminum, and steel generally has far fewer clearance issures with other components, plus some STEEL roller rockers are REBUILDABLE
http://store.summitracing.com/partdetail.asp?part=CCA-1302-16&autoview=sku
http://store.summitracing.com/partdetail.asp?part=CRN-11600-1&autoview=sku
in MOST cases you can install 1.6:1 roller rockers with MINOR machine work, (I have seen on rare occasions no machine work necessary)
but in any case its easily done,
the tool comes with instuctions
http://store.summitracing.com/partdetail.asp?autofilter=1&part=PRO-66485&N=700+115&autoview=sku
and before a dozen guys start telling you they installed them with zero problems on stock heads, keep in mind most guys don,t take the time to check ALL the clearances thru THE FULL rotation of the rockers arc. and it they don,t break or bind parts ,THEY assume its fine
but the truth is the pushrod should NEVER touch either end of the slot even lightly anywhere in the arc.
more info
http://www.vetteweb.com/tech/0204vet_sm ... index.html
http://www.digitalcorvettes.com/forums/showthread.php?t=82474
http://www.centuryperformance.com/valveadjustment.asp