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23.06.2021 0:08:48
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While the Hydra-Rev solution does work, the reality with hydraulic roller tappets, whether factory or aftermarket, is that they are heavy. And any heavy component in the valvetrain is inherently bad with the possible exception of pushrods. The real question is: Why would you want to invest in a heavy valvetrain if you are trying to make highRPM horsepower? The best solution is to convert to a mechanical roller camshaft. Mechanical rollers do not suffer from a moving lifter cup position because, as a mechanical lifter, this position is mechanically fixed. The only possible negative to mechanical roller tappets for street use is the fact that they require periodic lash adjustment. However, this is not as much work as you might imagine.
For example, several years ago, Jack Chisenhall, the owner of Vintage Air, took his 700-ci big-block Chevy-powered Studebaker on the Hot Rod magazine Power Tour. The car performed surprisingly well for the first portion of the Tour. However, after perhaps a thousand miles of highway cruising, the Rat motor succumbed to several broken valvesprings. At first, it appeared that weak springs were to blame, but the engine was originally designed to run 200 mph at Bonneville, so it was built around a race mechanical roller camshaft. The race roller’s aggressive lift profile probably contributed more to the broken valvesprings than any other factor. Street mechanical roller cams tame much of the abuse out of the velocity curves, requiring less spring pressure since their highRPM limit is generally lower.
From left to right is an OEM-style hydraulic roller lifter, an aftermarket retrofit hydraulic roller lifter, and a mechanical roller lifter. more
Starting in 1988, GM began using a hydraulic roller cam in their production car engines. This required a cam thrust plate on the front of the block. The step in the nose of this cam (left) identifies it as a cam intended for use in a production roller cam block. here
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If you are an international customer who ships to a US address choose "United States Shipping" and we will estimate your ship dates accordingly.
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I am in the United States more
If you are an international customer who ships to a US address choose "United States Shipping" and we will estimate your ship dates accordingly.
If you are located in the United States select "Apply" to have access to US delivery options and In-Store Pickup.
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It would be a lot cheaper to just run an electric fuel pump with a regulator to set fuel pressure to a level that would work for carb inlet pressure (5-7 psi). more
"I'll take a guess and say machining for the fuel pump pushrod is probably 200 bucks or more if the shop even wants to do it."
Loc: foresthill CA
Reg: 05-08-05
here
Loc: TRAFFORD, PA. USA
Reg: 10-11-02