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| | | | Joined: Apr 2009 Posts: 431 Shop Shark | | Shop Shark Joined: Apr 2009 Posts: 431 | is scratching their head about this
'older' engine stuff/crank bearing cap shims and bearings. and, was the poor wear pattern that we saw on all the bearings due to an error on the previous rebuild? the books show diff cranks at the '54ish mark. but only a .001 diff.
'only', he said
my block is def a '58-'62/3769716. but what about this crank? 3701488; anyone have a year/specs for that number?
and the lifters still have re-grind?
'cross-hatching' on the outer edges, and are no longer convex. recent rebuild? by national engine & parts co. 08 I9M
going up to the shop tomorrow after some fact finding between they and 'us'
what say ye? | | | | | Joined: Apr 2006 Posts: 506 Shop Shark | | Shop Shark Joined: Apr 2006 Posts: 506 | rednate,
Your crank first appeared in 1953 in full pressure 235's....
and is used in all full pressure 235's thru 1962.
The same crank is also for the 261 engine with the same specs listed below.
The Main Bearing Journal Diameter
listed in the Motor's Truck Manual as:
No. 1 - 2.6835-2.6845"
No. 2 - 2.7145-2.7155"
No. 3 - 2.7455-2.7465"
No. 4 - 2.7765-2.7775"
Main Bearing Clearance:
.001-.003"
Main Bearing Cap Bolts torque:
100-110 Ft. Lbs.
Also, your block has a date code, if you want to narrow down the date.
-Tom
1950 Chevy 3100 w/ 1956 235
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