i need help w/duster engine
holy heck..
she is right...
"Magnum heads have stupidly designed valve guide bosses that stick up out of the head far enough that if you try to open a valve more than .530", or so, the retainer runs into the boss and won't allow any farther opening than that. (.530")
they did..they moved the whole guide up in the casting to keep it out of the port roof...
thats smart perception right there....girl....!
ill ask a few questions..
i have a very very similar engine as what you have.
they are even kb107 pistons.
***we need to know what your piston to deck hight is..(should have this data from assembly)
***we need to know if the pistons have standard as shipped valve reliefs or did someone make them bigger..you stated 2.02 intake valve.
stock length are they stock valves?
***springs dont matter to me..but installed height does..?
*** you need to find out how much "layers" in thousands of an inch were removed from the heads and block
You stated the heads are cast iron X heads? is this correct? you also stated you have .634" of lift to coil bind..so the guides have definately been cut.
i am thinking you get some spec's for a cam that you think youll want..( this will be based soley on flow graph of the ports imho)
and then put in the numbers and open the valves at these events while its assembled on the motor...(someone suggested light checking springs)
then open the valves at the extreme ends of the events...and see what your clearence is...
you may need tall valves for the proper spring heights....as roller need much more spring...although your running a solid lift flat tappit now...right..?
i am no expert..but thats a start...
cheapst.
ps ive had my fair share of carburator issues..lol......
