Starting to get cold down here in the mornings.

How long should a block heater run to get it to the right temperature. Going to use a timer on the scoket but want to know how long to set it for. 30 mins?? 1hr?? 90 mins?? More.

Not even sure if I have a block heater though so i'll have to do some digging.... I imagine a 87 300sdl should have one though.

PS of block near the rear of it right?

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87 300SDL (work in progress) will be DD
92 Toyota Land Cruiser 4x4 monster (heavily modified)
build thread on mud http://forum.ih8mud.com/80-series-tech/288587-rotf-lt1fire.html

84 K1500 GMC Suburban 6.2 diesel motor...... dying to offer its engine to the Land Cruiser