OLD Modified Corvettes

Mike Taylor 3601 · 12-19-2013, 04:41 PM

Dick,
I agree with you on keeping cranks from getting crazy,alum rod I don't see as issue,a good high quality steel rod cost more than alum rod does,so don't see it as money issue,personally if this class existed,and I was'nt allowed alum. rod I would probaly spend $300-500 more on steel rods I would trust @RPM I would be cranking.
Randy,
Stud mounted rockers vs.shaft are toss up, if starting with nothing cost is not much different,on these engines shafts would not be expensive,first off no offsets would be need so that cost less. Shafts are easier to get on engine like we are talking about if has long valves ,stud mounted have to buy $400.00 ish rocker that has clearance for anything over 1.500 spring or clearance some that cost 250 ish then add 75ish for best arp stud,150-250 for stud girdle,you are right at shaft price.

One thing that could be possibly good ideal is limit lift @ valve to .630-.660 lift that eliminates reason for having valves over .100 longer,don't need all the extra installed height to get springs on heads that will work with bigger lifts,and that eliminates problems of getting rockers to work. If you ever have put .200-.300 longer valves in sbc w/stud rockers you know what I talking about,as rocker is higher up stud,pushrods get longer, rocker body gets closer to retainers,roller gets moved to outside tip of valve,this also happen on shafts,but all you do is get set of stands that moves rocker back toward intake,and has material added to bottom of stand so you don't need .150'' worth of shims.

Also if shafts was allowed that would be level for all three brands on valvetrains.
All rules look good to me,I would maybe add if not covered,material, bore spacing,deck height, maybe say deck has to be 9.00-9.500 that will cover sbc,mopar,and ford,or some how keep short deck exotic stuff out. I know this elimnates 8.200 (302) based windsor,but it's is probaly too short and could give advantage of lighter rotating assm to that combo over the others.
Mike Taylor 3601

12-19-2013, 04:41 PM	#11
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,369 Likes: 348 Liked 292 Times in 101 Posts	Re: OLD Modified Corvettes Dick, I agree with you on keeping cranks from getting crazy,alum rod I don't see as issue,a good high quality steel rod cost more than alum rod does,so don't see it as money issue,personally if this class existed,and I was'nt allowed alum. rod I would probaly spend $300-500 more on steel rods I would trust @RPM I would be cranking. Randy, Stud mounted rockers vs.shaft are toss up, if starting with nothing cost is not much different,on these engines shafts would not be expensive,first off no offsets would be need so that cost less. Shafts are easier to get on engine like we are talking about if has long valves ,stud mounted have to buy $400.00 ish rocker that has clearance for anything over 1.500 spring or clearance some that cost 250 ish then add 75ish for best arp stud,150-250 for stud girdle,you are right at shaft price. One thing that could be possibly good ideal is limit lift @ valve to .630-.660 lift that eliminates reason for having valves over .100 longer,don't need all the extra installed height to get springs on heads that will work with bigger lifts,and that eliminates problems of getting rockers to work. If you ever have put .200-.300 longer valves in sbc w/stud rockers you know what I talking about,as rocker is higher up stud,pushrods get longer, rocker body gets closer to retainers,roller gets moved to outside tip of valve,this also happen on shafts,but all you do is get set of stands that moves rocker back toward intake,and has material added to bottom of stand so you don't need .150'' worth of shims. Also if shafts was allowed that would be level for all three brands on valvetrains. All rules look good to me,I would maybe add if not covered,material, bore spacing,deck height, maybe say deck has to be 9.00-9.500 that will cover sbc,mopar,and ford,or some how keep short deck exotic stuff out. I know this elimnates 8.200 (302) based windsor,but it's is probaly too short and could give advantage of lighter rotating assm to that combo over the others. Mike Taylor 3601