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#5
11-24-2025, 04:45 PM
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I suspect the fact that they couldn't sell the 455 in the F bodies was a reason they didn't make a true high-performance version of the 1970 455. Also, the long stroke of the 455 on the stock bottom end of the 1970 455 wasn't compatible with the high rpm characteristics of the RA IV cam and valve train.
The closest to that was the 73-74 455 SD, it doesn't take much to imagine what 25% more compression and the high lift duration of the RA IV valvetrain would have done to the power band.
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My Break Away Squad 1969 Fbird (base OHC, 350, 400HO & Sprint Cvt’s - 400HO & TA ht’s) 1969 Custom S 2dr ht 1969 LeMans (2dr & 4dr ht & Cvt) 1969 LeMans Safari wagon 1969 GTO (2 Cvt, 2 ht & Judge ht) 1969 Cat (3 Cvt’s & a 2dr ht) 1969 Ventura wagon 2 seat 1969 Exec 4dr post 1969 2 Bonnie Cvt's & 2 wagons 1969 Bonnie Brougham (4dr ht & Cvt) 1969 Grand Prix 2 SJ’s 1969 2+2 2dr ht (Canadian) |
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