rpm loss problem.. help!
i was running a cleveland with 2v oc heads heavely ported,weiand x-cel, a hyd tapped cam .560 lift and 245 duration, my valve springs are 337lbs the car would twist to 7000rpms and reliably built power to 6500+rpm.
i just recently converted to oc 4v heads, new stainles valves same valve springs and edelbrock torker intake and portplates on the exhaust side only. same cam, same everything. all ports are portmatched for best flow. problem is
it only twists to 5600rpms and then cuts out like its hitting a rev limiter. i played with them timing some but i live in a residential neighborhood and cant scream up and down the street and the track to too far away to go if evrything is not working well.
anyone have any ideas? also, i have a msd pro-billet dist. if anyone else has a msd dist. and a relatively close set up could you tell me what spring combos you use and what color over-all advance bushing.