they might have been the motor supplied for photos on cover of How to hotrod big block chevys by bill fisher an bob waar, its a 1971 publication all pics are black white except cover, alot of picks of jenkins motors, chapparrell, mcclaren, reynolds blocks. The motor on cover and a few shots inside has a cast number on front top of block right below intake manifold, its says 0394 150, looks like that too, with a space between 4 an 1, its large don't need a magnifying glass but it helps, intake looks like an L88 but a little different, has shot of heads top view too, this states the engine was a corvette option that also appeared in some 69 camaros, lists some part numbers and specifications such as cam, etc, cover photo credits are to ed sperko of GM photographic chevrolet public relations, intake shot says 3933163 but says its part number 3947083 open plenum different thatn 3947084 fully divided plenum both machined from same casting, also states zl1 cam is part number 3959180 stamped 9181 .560/.6000 lift duration 347 degreeintake 359 exhaust, there's even a fuel injection cam for the zl1 and canam blocks it has .6000 lift on both and 360/366 duration part number 3994094 also chain driven, gives just about every part number for zl1 motor.The real interesting article is on the 482 chevyturbo marine, 25 produced for kiekhaefer and destined for off shore long distance raceing, a few cranks, rods, and pistons were available for a short while but after a fully thorough search they were not able to find any for part numbers or pics but got specs to build one, a 454 crank stroked to 4.25 inch will provide 482 displacement w/ stock 427/454 bore, tests on one w/ two turbosuperchargers appear on pg. 125. I can give more info or publishers if any wants it, best engine book I've ever owned shows you how to build everything.
