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1972 GMC 637 V-8 video
From the GMC 6066 site; a posted vid of this Kool engine
Info from Jolly's site; 
637 V8
275 @ 2800 rpm
185 @ 2800 rpm
250 @ 1550 rpm
560 @ 1550 rpm
5.125" - 3.86"
637.0 cu. in.
(10.4L)
7.5 to 1
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MusicMan70
1961 GMC Suburban
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