[FordGtMan]

Ive got a motor that is from a 1975 mustang and i need to know what cylinder head cc chambers were used. Got a set of e7's for free and need to know if there will be a substantial compression loss. I researched but couldn't find any info on any mid 70's heads. Thanks for your time.

[clint]

snapshot from the 1975-76 car shop manual. Pic is for -75 specifications

[Dave]

If that '75' motor is still stock you might drop only .02 in compression ratio. The stock heads were 58.2 cc, C/R was a low 8:1. '73-76" motors had a higher deck height by .022-025" and deck clearance was different also by .018, might want to mill the heads a bit, maybe .020". I's sure check with an experenced Ford machine shop first.
Dave