I did a cam change on my 454 (bored .030" over) and ran into valve bounce at 5500 on the dyno. HP at 5500 was 483 and still climbing until bounce set in. I have a juice roller cam - Comp Cams 11-451-8 (230/236 @ .050", .547/.547" lift at valve, 112 deg lobe sep). I am using Comp Cams beehive springs #26120, which have been on the engine a couple of years.
Question is: I bought some .060" cups to go under these springs in the hopes that they will stiffen them up enough to allow another 300rpm or so. Will this work, and will the springs be more likely to fail with the decreased .060" installation height?
I have all the good parts in the rotating assembly to allow 6000+rpm (Manley H-beam rods, cross-drilled nitrided forged crank, forged pistons etc).
I just want to get near 6000rpm out of it - then I'm pretty sure I will have 500hp.
What other tips might anyone have for getting a few more revs - would shaft rockers do it? (kind of expensive!)
Thanks guys,
Chris