Aluminum heads are fine. The ticking could be a lifter going bad, a rocker that is getting loose, a worn lobe on the cam (causing the rocker to be loose), a bent valve or pushrod (again causing the rocker to be loose), and more. Before you swap out heads, you need some more diagnostic work to see what might be going on. Static compression, leakdown test, check the valve lift, check the valve lash, then you can worry about pulling the intake and heads and looking for more things.
I ran unleaded with my old iron heads for years and I never saw any problems. I've been told that the problems are only for those who run the car for long periods at high load (such as racing) or high RPM. If you are driving it hard and having fun, you are probably OK with unleaded fuel. Brad Waller ([EMAIL PROTECTED]) '66 Corvette | 327/dead | 4-speed | Wilwood Brakes | 245/45/16 BFG R1 '67 Chevelle | ex-SS396 | 355/700R4 | F-Body Brakes | 275/40/17 Kumho MX > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Pelle Andersson > Sent: Tuesday, May 10, 2005 1:25 AM > To: Chevelle-list@chevelles.net > Subject: [Chevelle-list] Heads? > > Aluminium heads on a cast iron block? > Is that a bad idea? > I've got a beginning ticking sound i one of the valves so I'm > planning to either restor the heads or buying new > aluminium race prepped heads. I also want to be able to > run the car on unleaded fuel! > > Have any of you any experiences fo aluminium drive shafts? > Pros, cons? > > What is your suggestion? > > _________________________________________________________________ > Don't just search. Find. Check out the new MSN Search! > http://search.msn.click-url.com/go/onm00200636ave/direct/01/ > > >
