what motor is it? If it is the 3.0 then it is a single overhead cam (one per bank of cylinders). The 3.0 is a non interference engine which means you won't damage valves if you time it wrong. The 3.0 is prone to head gasket problems and it appears that Toyota is still willing to fix or replace engines from about 89-95 so you might want to check with a dealer to see if your truck has been done. Some people report getting new blocks as there is sometimes etching of the deck that causes problems.
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1968 Chevy - 292 with a powerglide
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