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Just turned 60K miles, bone stock short block from 1971. .039 Cometic head gaskets. According to the service manual, the 383-300 stock cam has 260/268 degrees duration.
1971 383, stock bottom end with fresh 452 heads milled .020. I had the plugs out so figured I’d do a compression test. These numbers look good to me but I’ve never tested cylinder pressures on a big block before so wanted to ask ya’lls advice:
Makes sense. Honestly I’m not sure why anyone would spend the effort welding up a 452 head on a motor home and then machining the intake surface flat, since you can get a pair of them for a hundred bucks.
I pulled a 440 out of a motor home with just over 32k on the odometer, engine is super clean inside… can still see the cross-hatching in the cylinder walls. Pulled the heads and one of the walls between the intake runners has been welded. It appears to be a solid weld. Would this have been...