It’s off to the machine shop with these cores for a hot tank & mag, hoping they're both buildable cores. I do prefer the 4-bolt main blocks but would build a 2-bolt in a pinch.
Now’s a good time to mention that there is a third block in the mix. Snagged another 4-bolt main block that's been slated for this Camaro build back when we built our 489 for my 72 K30.
http://67-72chevytrucks.com/vboard/s...&postcount=602 Don’t know much about this 3rd block other than it was available from the machine shop at the time. It's been bored just under .030 thou so the final bore and hone would take place when we’re ready to build. It's a 10069286-casting number (same as my K30 btw) which is a 90-91 454 4-bolt, Mark IV, Short deck, build date stamping is T1025FCJ T=Tonawanda, October 25th, FCJ= 1990 Truck 454 MT L-19 TBI These blocks were only cast as a 4-bolt main and are some of the very last factory Mark IV’s produced.
What’s the point of all this, my goal is a 496 or bigger (perhaps a 4.375 stroke 509-511?) for the Camaro, and another 489 for our C10 shorty project. I’ve had some great small blocks, super LS’s (including turbocharged) but I just love my big blocks!
