Quote:
Originally Posted by SWEETJUDGE
389 cranks & ram air IV cranks are ARMA STEEL (much better) than NODULAR.
all pontiac cranks are nodular except noted above.
all or MOST pontiac blocks will have the last 2 digits cast in the valley of the motor
00 = 400 55= 455 28= 428 and so on... some are also cast into the sides of the blocks aswell.....
Heres a good tip MOST all of large journel blocks have a pyramid near the dist. THIS IS A STREET RACING TRICK... if you cant tell what the block is look for the pyramid. NOW the street racers know this & is very common for people to hack that off to appear to be a smaller motor
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Sweet Judge,
The valley 2 digit castings didnt begin until 1969 and the pyramid is on all 421-455 blocks as well as the 326's and 350's. Only the 389-400 's had no pyramid.
And yes as mentioned above "Arma Steel" is cast and no better than an "N" crank.
What this young man has is a 70-74 350 (dual - early/late motor mount holes "5" holes on all 70-76 engines) , windage trays ended after 74 (mostly 73) , 75-78 blocks are not drilled for a windage tray at all.