Dart 351W Ford blocks are tailored to the most popular performance and racing applications, with an 9.500 deck height and a choice of 4.000 or 4.125 Siamese cylinder bores ... which can safely be bored to 4.185. Cast or steel main caps are splayed 4-bolt on the center three and 2-bolt on #1 and #5, and utilize 1/2 inch bolts. The valley is machined to accept factory roller lifter guides and retainer (spider) but may also be used with link bar lifters.
