Sooo couple things..im selling my motorcycle. .i plan to use the money to pay for the motor and was planning 2 other surprises. .might as well let them out..i was planning on getting a paint job (still do)..
The other..WAS planning on getting some 1.8 roller rockers (wont mention names)Sooo not going to talk bad or say he's wrong or anything but will point out the mathematical side of it and been confirmed by comp cams..
Lets start with the 422 cam..it has a intake lobe height of .334 and exhaust of .333
Next this is where it gets technical. .there has been only one set of springs that match the specs of the 422 and will work with our heads and retainers..its the comp cams 988 springs..
The 988 have a installed height of 1.6 and a coil bind of 1.0 and need a safety cushion of .060 <<the industry standard. .
To get valve lift you multiply (cam lobe lift)x(rocker ratio)
(.334)x (rocker ratio)
Stock rocker ratio is 1.5
Math time...
(Coil bind)-(installed height)-(coil cushion)=MAX LIFT
1.0-1.6-.06=0.540 <<< max lift
Max ratio rockers with comp cams 422 i can run is 1.6(.530 lift)
They do not make any springs ive found or comp cams found that will work with the comp cams 422 OR 410 with a rocker ratio greater than 1.6
Now the do sell 1.6 ratio roller rockers but "he" should let people know 1.7 or 1.8 ONLY work with stock cams..will NOT work with a aftermarket cam....unless you change the spring height which effect the seat pressure and open pressure..or unless you go under the .060 coil space before coil bind
1.6 aint worth $880 PERIOD
Here'sa diagram they sent me confirming where to measure for safe max lift before coil bind...also confirmed the "coil bind" measurement does not include the safety margin, its just when bind/damage happens
