hey guys I have a '69 sbc 327 w/ 2.02 heads 74cc . the piston are .40 over flat tops ; so the compression is about 8.8 :1. ; trans is a turbo 400, rearend is 3.73 gears, radiator is a brass/copper 4 row hd from walker. have a mech fan, with shroud
also a elec. pusher in front. the timing is 13 btdc total timing is 34 @ 2900 rpms
the problem:...
when I am just cruise around the engine will stay around 180, I can leave it in park & the truck can idle all day & not get hot.
but when i am driveing it down the road @ 60mph or faster the temp slowly starts going up & would go to the point of over heating, but when I slow down to 30mph the temp will drop all the way back down to 180 in less than 5 min? I have replaced the termostats, water pump no change. am I possibly running to much intial timing? (I do not know the cam specs, but the engine has a lope idle)should I retard it to 10 btdc?
does this sound like a timing problem? any help would be appreciated