Tuning 165 for SC - and ALUM Heads

[Don.F.Broadus at ucm.com]

It is very important to have the aluminum head resurfaced and checked for
hardness. In some cases if the engine was overheated the head could have
lost its temper between the cylinders that have the exhaust valves next to
each other. The head might have to be heat treated  or a replacement found
so as not to blow a gasket again. 
 
Don
> -----Original Message-----
> From:	nacelp at jvlnet.com [SMTP:nacelp at jvlnet.com]
> Sent:	Tuesday, July 06, 1999 4:55 PM
> To:	gmecm at efi332.eng.ohio-state.edu
> Subject:	Re: Tuning 165 for SC - and ALUM Heads
> 
> Had you been reading the plugs?..
> Where did/how did the gasket fail?
> If ARAP, are you doing something trick, or running MAF?
> What are you doing for reading the addition Air Flow?
> What for addition fuel (pump+injectors)?
> I have a strong suspicion that the stock ESC might be kinda blind at oil 
> enduced detonation, at higher RPM then when the ESC is tuned for.  A vary 
> slight amount from the blower, might be the oil source, don't take much at
> 
> higher rpm.  
> I'd think twice about running a syclone calibration.  That way you can go 
> way retarded with the timing at any "over boost".  
> Bruce
> >Just an update - and any comments would be great.
> >
> >I had JUST gotten the knock outta the cal by tweaking some main spark 
> >values, and was satisfied with the "base" changes I had made (spark 
> >mods only) when POOF - a head gasket goes out. (125k miles). I had 
> >not even the chance to start addressing the fuel changes for the SC 
> >addition and now I gotta think about changes to help idle and changes 
> >to accomodate/ take advantage of  the larger 200cc intake runners, 
> >and the effect that the aluminum heads will have on the whole thing. 
> >I am using GME (GREAT TOOL!) to tweak the thing and am open to being 
> >taught what areas I should address first. tips, techniques etc.. 
> >anything. the car is an 89 IROC 5.7L, if you missed the last post a 
> >month ago. ARAP bin, 165 ecm, (SC = Supercharger, 6 PSI max)
> >Dave Z. www.delanet.com/~tgp
> >