351M???

[Mark O'Neal]

Originally posted by Daniel Jones


Yup. Before all the fancy SVO blocks were available, Jack Roush's own
Autokraft Cobra was powered by stroked 400 with SVO high port aluminum
Cleveland heads. An old Super Ford article ("The Cobra that Jack built")
gave the details. The article stated Jack wanted a torque monster and a
460 would have been his choice but no aluminum heads for the big block were
available at the time. To keep the weight reasonable, he decided to stroke
a 400 and use Motorsport 351C aluminum high port heads. Using a custom
stroker crank and boring the block 0.030" over, he was able to get 460 cubes
out of the 400 block. Adapter plates and a Motorsport high port intake,
(looked like an Edelbrock A331), were used along with a 780 Holley. The
cam was surprisingly mild, a hydraulic Comp Cams 280 with 0.530" lift (the
article mistakenly states 0.500" lift). Claimed output was 520 HP.

Dan Jones [/b]

Yet the average 427W with a set of AFR's and a middling H/R cam is in the 575 range.

And Jack doesn't have a single Cleveland for sale on his website.

For a semi purist Pantara these things make sense, 351W's just look funny sitting in there.

It's just way less expensive to do a stroker W for the power per dollar.