1987 242 ls
#11
Are you sure its not 1.32? That was a common ratio for the 454.
The 1.47/1.5 ratio needs a prop with about 2 more inches of pitch to equal the 1.32. So your 19 pitch is like a 1.5:1 with a 21 pitch.
The 1.47/1.5 ratio needs a prop with about 2 more inches of pitch to equal the 1.32. So your 19 pitch is like a 1.5:1 with a 21 pitch.
#12
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^that was what i was thinking, so if it is in fact a 1.32 or thereabouts and given the rpms he's turning with no trim, that engine must be making some pretty good power.... so, still under propped.
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