I would appreciate hearing from some of you about the sturdiness of the Speedway roller tipped rockers since I have installed them but not started the engine yet. For this discussion compare tests 55 and 56 of Ryans dyno runs. What this means is that if the cam is small it helps to have more lift on the exhaust but as further tests show with a longer duration cam the cam takes care of the needed scavaging. The Speedway roller tipped rockers are available in both 1.5 and 1.6 ratios. I bought two sets with initial setup using the 1.6 rockers and maybe backing off to 1.5 on the intakes for better mpg. Does anybody have any bad experience with the Speedway roller tipped rockers? Note that the stock rockers "scuff" the valve tip and this raises oil temperature while any roller tip rocker will encounter less friction so the engine should run a little cooler.

http://www.ryanscarpage.50megs.com/combos8.html

Don Shillady
Retired Scientist/teen rodder