Redtop,Blacktop,Longblock, please explain somebody...
I wonder what's the differense between for example redtop and blacktop on the SR20DET. Does it have something to do if it's an egine from S13 Silvia or S14? I would like to buy an engine to put into a S13 Fastback, or to buy a car ready fixed. The idea is later to take out about 4-500hp.
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