70 Judge RAIV and V continuation

[MotownMadman]

Steve,
The 427 Tunnel Port performed well as a race engine, but Fords first attempt at using the Tunnel Port design on a production street engine was the 302 in 1968. That is when all the problems had developed for street use. I would have thought that Pontiac would have taken notice to that, but possibly they already had the Pontiac V engine developed to the point of no return, based on the performance of the Ford 427 engine. For that design to work correctly it required huge cubic inches and high RPM which both the Ford 302 and Pontiac 400 were lacking for constant street use.
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[John Glasgo]

I can say from experience that the RA 5 was not the dog that everybody acts like,the 69 GTO that i did with the 5 motor,stock GTO exhaust manifolds,2.5 kinked full exhaust system,4.88 gears ran a 12.4 at 111.00,this was in a concours show car.It pulled hard to 7000 rpm,i drove it once when i first finished it with no exhaust,and 2 foot dumps,that car flat out flew,the exhaust really hurt it.I have had every Pontiac motor made,the RA5 car was definetely the neatest.the biggest flaw with the motor was that the rods were junk,and most of them let go before the true potential of the motor was realized.

[tjs44]

John,I never meant to say the V is a dog.My motor is 446CI,9.5CR and makes 555HP at 6100 with a single 950 holley.I have had a few V motors on the dyno and they all gave up around 6100 with the factory single 4.The 2-4 tunnel ram pulled all the way to 6900.What I was saying is if you put the same setup with a RAIV head with the same flo numbers as the V head,the IV would make more HP.I have not done the compare my self,just from a eduacated guess.Tom