<BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR>Originally posted by MK -IV J6:
Mark
What do you feel is safe for my 427?
I've use 7000 for years without any problems.
Roller cams etc.
Best<HR></BLOCKQUOTE>
Jim, I'm not as familiar with the 427 as I am with the small-block engines. Yours is a side-oiler, right? Screw-in core (freeze) plugs? Tunnel-port heads with the nearly circular intake ports? I would also guess that your engine uses the "LeMans" connecting rods that are also used in the 427 SOHC, notable in that they use cap screws (12-point head with undercut shank) instead of the bolts and nuts used on most production 427 FEs.
As you know, the self-imposed redline on the 427 at LeMans was something like 6,200 rpm. The 427 SOHC was good for up to 7,500 rpm, and it uses the same block (with cross-bolted mains) as the 427 FE. Therefore, I would think that short bursts up to 7,000 rpm are fine but I would keep sustained engine speeds at or below 6,000 rpm.
Lyn, I've never seen anyone rev a hydraulic cam much past 7,000 rpm.