Thread: are roller tipped rockers worth the investment?

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Originally Posted by pat mccarthy

i had 1.6 harland sharps on a 4.3 this was my driver i bet they had 10.000 on them and still where ok when i soild it so matt like dave S said this is on places to get cheap sorry dave i can not help here but to say i not a big fan of the new trend for super big rocker ratios was talking to a guy that was running 1.8?? on some killer small block i just do not know how they keep the valve springs in them

We never went that big, just 1.6 and 1.7 on the exhaust side. For whatever reason (exhaust scavenging manybe) seemed to extend the hi torque range by about 800 RPM on the dyno. Probably nothing that would ever matter on the street.....???? Coil bind does become an issue, along with tipping the rocker past the center of the valve stem.....

Originally Posted by Dave Severson

We never went that big, just 1.6 and 1.7 on the exhaust side. For whatever reason (exhaust scavenging manybe) seemed to extend the hi torque range by about 800 RPM on the dyno. Probably nothing that would ever matter on the street.....???? Coil bind does become an issue, along with tipping the rocker past the center of the valve stem.....

Yes,Dave the increased rocker arm ratio on the exhaust side will help to wake it up if your intake to exhaust ratio is a little off.

A little somthing from left field.Rather than useing more lift why not more duration and leave your lift at 5.1

Originally Posted by cffisher

A little somthing from left field.Rather than useing more lift why not more duration and leave your lift at 5.1

from my understanding, a turbo would work best with a shorter dururation with a lot of lift, that's why I decided on going with 1.6 or 1.65 rockers.

Originally Posted by cffisher

A little somthing from left field.Rather than useing more lift why not more duration and leave your lift at 5.1

for a turbo you have to watch the duration on the ex side

Don't know if you don't ask

Originally Posted by pat mccarthy

for a turbo you have to watch the duration on the ex side

yep, just as an example, the old Isky 144-200 Turbo cam has a 260 intake dururation and a 248 exhaust dururation.