There was a great variety of solid replacements for hydraulics, Freeman,...
Not only aluminum pushrods instead of the more desireable steel, but various "slugs" and adjustors that replace the hydraulic unit were sold over the years, and care must be taken to assure the pushrods match the lifter replacements:
LFTRCUPS.jpg
(Early OEM on left..)
LIFTERS.jpg
(Left to right: Early OEM tappet and pushrod with hydraulic (not shown) at top of pushrod;
An aluminum pushrod with the adjustor in the "slug";
An aluminum pushrod with the adjustor in the pushrod;
and the OEM hydraulic assembly with a steel pushrod.)
Colony produced quality 'slugs' for the late OEM pushrod, but other aftermarket replacements should be inspected closely:
SLUGWEAR.jpg
(Note the extreme differences in contact wear on a matched set!)
And please inspect the top of the pushrods as well; I have found Shovelhead replacements crammed into a Pan...
Looking forward to your observations,
....Cotten
Not only aluminum pushrods instead of the more desireable steel, but various "slugs" and adjustors that replace the hydraulic unit were sold over the years, and care must be taken to assure the pushrods match the lifter replacements:
LFTRCUPS.jpg
(Early OEM on left..)
LIFTERS.jpg
(Left to right: Early OEM tappet and pushrod with hydraulic (not shown) at top of pushrod;
An aluminum pushrod with the adjustor in the "slug";
An aluminum pushrod with the adjustor in the pushrod;
and the OEM hydraulic assembly with a steel pushrod.)
Colony produced quality 'slugs' for the late OEM pushrod, but other aftermarket replacements should be inspected closely:
SLUGWEAR.jpg
(Note the extreme differences in contact wear on a matched set!)
And please inspect the top of the pushrods as well; I have found Shovelhead replacements crammed into a Pan...
Looking forward to your observations,
....Cotten
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