GM ECU 1227730/47: basic questions

[John Zarli]

sfg wrote:
> 
> I am using the 1227730 ECU and have a few basic questions:
> 1. since it is so common, where might I find the disassembled code?
>    (I'm using the EPROM 16139544 '87 K5 Blazer: manual trans, TBI)
> 2. Is the memcal a fuse-link type ROM?
> 3. Which application parameters are contained in the memcal?
> 4. I have noticed ref to a "P" suffix on the p/n. Meaning?
> 5. Is its driver circuitry capable of operating with the combined
>    load of 8 injectors wired in parallel?
> 6. Will it run a ZZ4 GM engine (24502609) (with the 10185071 camshaft)?
> I know this is a lot of info, but since this ECU is so popular, answers
> may benefit many people on this list. TIA   Steve
Steve, stay tuned....I should know #6, whether a TBI system can support
a ZZ3 (10185071) camshaft within a few weeks. roller rockers are going
in now. Almost done.  Note that the alum heads on a complete zz3/zz4
engine are the old style bolt pattern....I've heard different opinions
regarding enlarging the bolt holes on newer manifolds to fit those
heads.