is it a cost saving?
Yes.
Dart little m lightweight iron block, $3,535.95
brodix aluminum block, $5,272.95
prices from
www.summitracing.com
tradition?
Don't know.
Are they related to nascar blocks in any way?
Don't know diddley about nascar
do they start life as a stock block from a manufacturer?
They can, but the dart block is more cost effective & is of more consistant quality.
Why don't they use a sprint car aluminum 410 in sc?
Speeds are about as fast as sc cars can "safely" crash with the 355's
if they did, could you swap the engines between a sprint car and an sc car?
Probably, but i think i would want to change the camshaft because of the track length & the car weight.