Either the RAIV was under rated or the RAIII was overrated sine there is no way only 4 HP separated the two.
I remember an old Roger Huntington article where he had the factory dyno curves for some 60's hipo engines. If they wanted to rate conservatively they pull the HP from below peak. For instance the 426 HEMI was rated at 425Hp @ 5000 rpm when it actually peaked closer to 6000 and 470HP.
Factory advertised ratings were just that, advertised.
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68 GTO,3860#
Stock Original 400/M-20 Muncie,3.55’s
13.86 @ 100
Old combo:
462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's.
1968 Pontiac GTO : 11.114 @ 120.130 MPH
New combo:
517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5” 4000 stall,3.42's
636HP/654TQ
1.452 10.603 @ 125.09
http://www.dragtimes.com/Pontiac-GTO...lip-31594.html
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