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merlin iii motown small block street world has taken the knowledge ... years experience manufacturing merlin blocks for competition and developed this ... such important features of the race block as reinforced bulkheads and main webs ... for street use like using the stock chevy oil pan pattern oem 2.750 mains and ... to note that world s merlin iii blocks are far superior to oem parts in terms ... of quality each block is precision cnc-machined using only ... compare this to factory-built blocks which are done on a production line and ... is known as tolerance stacking world blocks are manufactured to qs-9000 ... standard of excellence merlin iii blocks are available with 4.240 4.490 and 4. ... decks it s an excellent value in big block power made from high density cast iron ... thickness clearanced for 4.375 stroker crankshaft h-beam steel rods 9.800 deck or 4.750 ...