rgarrett

found out I have a targetmaster gm replacement engine casting #3970010 pad MH04800 made in mexico. Need to find info on timing and what spark plugs are used in this engine.

anyone know this info or where to find it?

thanks

Rick

cardo0

That casting #3970010 is for a '69-'80 vette, passenger car and truck. Don,t know what that pad (stamped?) number MH04800 means - possibly a VIN code as the 00 is not any kinda engine suffix. Take a look at the date code cast on block rear of the passenger cyl head (block casting # rear of driver cyl head).
I got a GM Goodwrench 350" in my '74 vette and it has "Hecho En Mexico" cast into the block. And there's nothing wrong with these blocks as even the new ZZ4 motors are "Hecho En Mexico". In fact i think all the Gen I small blocks are now "Hecho En Mexico". If its a earlier year block inplanted in ur '86, it maybe a rebuild and only the poeple that put it in will know whats inside it. Sorry Rick but i'd be wasting our time describing a Goodwrench motor.
Now a compression test with less than 180 psi is fairly low compression and u could follow tune-up specs for any smog year L48 350". Like my '74 say: 8* intial advance, AC R44TS plugs with .035" gap.
Hope this helps. cardo0

rgarrett

thanks, I was told the Mh04800 breaks down as m=mexico, H=august, 04 day and 800=1979?

It does have the 86 cast into the back.

it has old autolite plugs in it but there is no id on them so im not sure what to replace them with?