Remove the oil pan and count the bolts on the main caps.
The 2 end ones will only have 2 bolts each in them no matter what.
If it's a 4- bolt main, then all the middle caps will have 4 bolts per cap.
A real LT-1 had a four bolt main block.
can be both ,i have a 350 010 2bolt main
A 350 with four bolt main caps is known as the "double-oh ten block." The last four numbers on the casting are 0010.
The main bearing caps will have four ( 4 ) bolts instead of two ( 2 ) they will be side by side. A four bolt 350 engine is more common in the bigger truck series ?
Almost certainly would be a four bolt main block.
Are you referring to the main caps? If you are some had two bolt mains, and some had four bolt mains.
There are no castings that were used exclusively for 4 bolt main applications.
yes it will bolt to a 350
There isn't a way to identify a 4 bolt main block without looking inside the oil pan.
None. The four bolt main block is thought to be more rigid at higher loads.
Only if the transmission has a dual bolt pattern. Chevrolet and Buick 350 engines have the same bolt pattern. Oldsmobile and Pontiac 350 engines have the same bolt pattern. There were some TH 350 transmissions that have dual bolt patterns.
Most Chevy 350 4 bolt engines will bolt into a 1979 Corvette.