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How can I tell if my engine's been modified? By Darel - 09/21/2002 7:22:46 AM; IP 198.81.17.37 I have a '61 T-Bird with a '66 Merc engine (390 probably). I'm pulling a steady 15 lbs. of vacuum. Everything I've seen said this should be more like 17-20. Other than a compression test (which I'll get around to eventually) how can I tell if someone's put a little bit of a cam in here, dropping the vacuum, before I start looking at a rebuild? I will do a compression check shortly, but for now I'm just wondering if there's anything else I can check. I'd really rather not pull the cam. Darel

This thread, so far...

Skip Navigation Links. How can I tell if my engine's been modified? -- Darel, 09/21/2002  Late cam or igntion timing -- mutangoldtimer, 09/21/2002  RE: How can I tell if my engine's been modified? -- John, 09/21/2002  RE: How can I tell if my engine's been modified? -- Darel, 09/22/2002

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