120-125 psi sounds about right.
> IMPORTANT <
Be sure to blow the spark plug pockets out well with compressed air before removing them. As you will notice, the pockets are upward facing and often filled with debris. Saw a lot of these GMC v-6 for fleet service at the shop back in the day and scored cylinders from dirt was the demise of many.
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1969 c-10 Step Side Long Bed. I-6 250cid = = 1969 Pontiac GTO hard top. 400, 4-speed.
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