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Geo Storm was manufactured from 1990-1993. Two engines were available the 1600cc SOHC and the 1600cc DOHC while it is possible to switch between one style engine for the other it is rather involved. Other sources for these engines are the Isuzu Stylus for the SOHC or the DOHC or the Isuzu Impulse XS for the DOHC. The Isuzu Impulse RS was a DOHC Turbo which requires considerable modification to install.
Answer: The ignition timing on a 1990 Geo Storm is 10 degrees BTDC. This applies to both the SOHC and DOHC 1.6L engines.
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The cam timing on a 4.6 SOHC engine is set by aligning the timing marks of the timing chain to the cam sprocket. This sets the initial timing based on factory settings.
The Ford 4.0 liter SOHC engine has ( 3 ) timing CHAINS
The Ford 4.0 liter SOHC - V6 engine has ( 3 ) timing CHAINS
Chain
The Explorer 4.0 does not have a timing belt. Both the regular 4.0 or SOHC model have timing chains. The SOHC, I think has the timing chain at the back of the engine.
The 4.0 L - SOHC - V6 engine has ( 3 ) timing chains
The Ford 4.0 liter SOHC V6 engine has ( 3 ) timing chains , and if it is a 4x4 there is also a chain for the balance shaft of the engine
not gospel but 4.0 sohc engine is an interference major damage if timing chain or timing chain tensioner breaks
for the 2.3 sohc its on the back of the valve cover