The later 235 had the head exposed where the spark plugs screw in. The older
motors (dippers) had the lifter cover sheet metal go all the way up to the
valve cover. These engines had full oil pressure to the conn rods, no dippers.
The full pressure engines are much better engines and have replaceable conn rod
bearings and have more hp and rev a little higher.
ALL THESE ENGINES ALONG WITH THE GMC 6's ARE VERY SUCCEPTABLE TO OVER-REVING.
DON'T DO IT. THEY WOULD JUST AS SOON THROW #1 ROD OUT THE SIDE AND KNOCK THE
GENERATOR OFF THE SIDE OF THE ENGINE. FIND OUT WHAT THE MAX REVS OF THE ENGINE
IN THE YEAR THAT IT WAS BUILT AND DO NOT EXCEED THAT SPEED!
The easiest engine swap to a more modern one is from a 51-54 Chevy car with a
Powerglide auto tranny. This has the water pump in the right place and has
full pressure bearings and more hp. Of course, if you can find a 261 Chevy, yuo
should go for it...
Dr Deuce
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