Originally Posted by 1955firstseries
LP = Low pressure??

If so, that's the old Babbit rod engine, either 216 or 235 truck engines form 1941 to 53. Also the Powerglide equipped passenger car 235 from 50-52. 54 235s are not "low pressure" engines. High and low pressure engine heads don't interchange- - - -there's a different number and spacing of the head bolts.
Jerry

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