Ok gang,
Week before last I got tied up in traffic and got my 302 hot enough to boil over. I pulled off, got it cooled down and drove it without any other problems. The truck sat all last week while I was out of town and I decided today to make a beer run in it. The closest store is 8 miles from the house.
It fired up, idled fine, but when I pulled out and stepped into it, the power seemed muted. Ran it up to about 70 or so between here and the end of the road. Leaving the stop sign, I stepped into it again, this time was greeted with the healthy small block roar I love so much.
Drove fine all the way to the store and back, no missing or popping. When I slowed to enter my drive, I started to hear a tick, That i had not heard over the exhaust earlier. It's coming from the #1 cylinder... Gave it a little rev and it sounds like a rocker arm.
Or a sticky lifter. Is it possible I jacked something up when it over heated? It's due an oil change, should I run a sea foam treatment thru the crankcase, do an oil/filter change and then do a lash adjustment? Top end was rebuilt less than 20k ago by p.o.
Any thoughts or advice? Thanks in advance

 

I'd look at the oil in the crankcase before doing anything or spending anything on it. Also check your coolant level and remove the #1 and #2 plugs and then crank it over with the distributor wire off to see if any coolant comes out of the holes. May have blown a head gasket