Rough year for HR lifters!
Here is a picture of a friend from Germany's 455 lifter/bore failure.
The engine had JUST been re-re-rebuilt.
After the car was imported, the owner realized the engine was bad. So had it pulled and took it to a shop.
1st build, the builder installed the wrong sized bearings. Motor was toast within a few hundred miles.
2nd build, with a different builder, the valve springs were installed without checking the pressure. Turned out to have just 60-65 pounds at the seat! The lifters were bouncing on the lobes, and pulverized the cam and lifter rollers within ~100 miles.
3rd build, same builder as #2. I suspect the lifter bore was cracked during the 2nd failure, and they just did not catch it. Mild HR from Butler, as were virtually all the parts.
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'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'.
'67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust
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