1971 Oldsmobile 442 Increasing compression ratio

Tiny
OLDSW30
  • MEMBER
  • 1971 OLDSMOBILE 442
  • 7.5L
  • V8
  • RWD
  • MANUAL
I need advise on how to increase the compression ratio of the engine since it is lower than the 70s models.
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Wednesday, July 8th, 2015 AT 1:10 PM

2 Replies

Tiny
HMAC300
  • EXPERT
Shave the head will increase it by a few points or get different pistons.
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Wednesday, July 8th, 2015 AT 3:03 PM
Tiny
M_H_RITZEL
  • EXPERT
To Beef it up some you can have the heads milled. That is take a little off the head increasing the compression. You want more have the cyclinder walls shaved, but go as little as possible Seen some with walls oversized to 60, over stock. . You can get a set of domed pistons. That would increase cylinder pressure
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Tuesday, September 8th, 2015 AT 7:06 PM

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