roller rockers
11-16-2007, 11:53 AM
#3
in limbo
Join Date: Jan 2007
Location: Iowa
Posts: 7,300
RE: roller rockers
a guy that lives a couple streets down from me uses these and he spins 8k. in his 82 stang 351w
http://store.summitracing.com/partde...p;autoview=sku
and another guy i know that works at the mustang shop recommended harland 7/16 stud for high rpms because "they're full rollers and are really responsive at high rpms and have a larger slot for easy allignment and have a standered body size instead of those narrow rollor rockers which crap out at high rpms."
http://store.summitracing.com/partde...p;autoview=sku
and another guy i know that works at the mustang shop recommended harland 7/16 stud for high rpms because "they're full rollers and are really responsive at high rpms and have a larger slot for easy allignment and have a standered body size instead of those narrow rollor rockers which crap out at high rpms."
11-16-2007, 12:40 PM
#6
in limbo
Join Date: Jan 2007
Location: Iowa
Posts: 7,300
RE: roller rockers
The 1.7 roller rockers lift the valve higher and fast= more power than the 1.6 units on a given cam. The 1.7 are generally used on the stock or a small/custom aftermarket cam and the 1.6rr are used when a larger cam is used over about 206@0.50 lift.
When the cam itself has enough lift the 1.7rr aren't needed and/or won't fit. The 1.6rr have about a 300 greater rpm limit over the 1.7rr on the same valve spring for better high rpm usage.
The stock rocker arms are stamped pieces of steel without a roller tip or fulcrum which results in higher fiction causing hp loss and higher engine temp. They are also weaker and more flexable compared to aftermarket units resulting in loss of lift and are limited in high rpm reliability.
hope this helps....
When the cam itself has enough lift the 1.7rr aren't needed and/or won't fit. The 1.6rr have about a 300 greater rpm limit over the 1.7rr on the same valve spring for better high rpm usage.
The stock rocker arms are stamped pieces of steel without a roller tip or fulcrum which results in higher fiction causing hp loss and higher engine temp. They are also weaker and more flexable compared to aftermarket units resulting in loss of lift and are limited in high rpm reliability.
hope this helps....
11-16-2007, 01:08 PM
#7
4th Gear Member
Join Date: Dec 2004
Location:
Posts: 1,668
RE: roller rockers
ORIGINAL: FivePointOhh
a guy that lives a couple streets down from me uses these and he spins 8k. in his 82 stang 351w
http://store.summitracing.com/partde...p;autoview=sku
and another guy i know that works at the mustang shop recommended harland 7/16 stud for high rpms because "they're full rollers and are really responsive at high rpms and have a larger slot for easy allignment and have a standered body size instead of those narrow rollor rockers which crap out at high rpms."
a guy that lives a couple streets down from me uses these and he spins 8k. in his 82 stang 351w
http://store.summitracing.com/partde...p;autoview=sku
and another guy i know that works at the mustang shop recommended harland 7/16 stud for high rpms because "they're full rollers and are really responsive at high rpms and have a larger slot for easy allignment and have a standered body size instead of those narrow rollor rockers which crap out at high rpms."
I second those! Used them for a year with no problems at all.
