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The key is knowing what you have

June 17 2017 at 11:13 AM

Ross  (Login Bad427stang)

Response to Compression ratio question

Specific parts matter, and measuring those parts matters more.

10:1 with a 280-ish adv cam on 106 is fine, especially if everything is measured and a tight deck

If you are going to run a mild cam and don't know exactly which pistons, likely that you are less than 10:1 but not knowing means it's hard to predict

Bottom line though, if you cam for 4.11s in a 390, up to 10:1 and maybe even 1.5:1 "should" be good
[linked image]
- 70 Fastback Mustang, 489 cid FE, Victor, SEFI, TKO-600 5 speed, 4.11 9 inch.
- 71 F100 shortbed 4x4, 445 cid FE, headers, RPM intake, 1000 HP series Holley, 4 speed

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