#2 · Mar 15, 2005. It means that the cylinder block has been rebored to +40 thou over stock.

A bigger bore with a shorter stroke also allows an engine to rev higher, which creates more horsepower. Conversely, a long stroke is generally better for fuel efficiency, because it reduces surface area during combustion. That allows combustion to do once again do more work and make the engine more efficient.

Power is made in the head and cam selection. Most 350’s stock put out around 180-210hp.

So a . 030″ over 350 is actually a 355 cubic incher, and at 1HP per cubic inch for a mild build, we would get 355 HP.

No matter what application your Chevy 350 motor is in, a few simple steps can get you more better performance and higher horsepower.

1. Modify your air intake.
2. Modify your exhaust.
3. Change your camshafts and valve train.
4. Purchase new cylinder heads, or have yours ported and polished.
5. Have your motor rebuilt and blueprinted.

It reduces friction if the flat tappets used 2 hp at 5,000 rpm and the roller tappets use 1 hp at 5,000 rpm you free up 1 hp call it added if you want. If the cam is a different profile that may give a different power figure depending on the existing cam it may even be a drop in power not an increase.

Method 2 of 2: Maxing Engine Performance. Consider installing a performance camshaft. Performance cams increase the duration and timing of the valve openings during the engine stroke, increasing horsepower and making your car accelerate more quickly.

Solid lifter cams can be a good choice for a hot street or race engine. They usually have faster ramps (lobes) than hydraulic cams, but not as fast as roller cams. They also need stouter springs than a hydraulic cam, but not nearly as stiff as a roller cam.

the Lunati’s are in fact made by Morel. It’s just that the street series lifter is basically a stock replacement unit….. just step up to the next ‘up’ in price (quality) and you will be fine. Absolutely.

Consensus is Isky Red Zones or Crane Hippo as they are more reliable on the street then other roller lifters. Other companies top of line lifters are fine for drag racing as only run few seconds! Don’t feel compelled to use Lunati lifters just because using Lunati cam! Good luck with your new engine.

To adjust hydraulic lifters two fingers spin the pushrod as the lock nut is gently tightened. When resistance is felt on the pushrod, that’s zero lash. The adjuster is tightened to specs then the setscrew locks it in place. When changing valvetrain components always check rocker arm geometry.

Hydraulic roller lifters are new alternatives to the traditional mechanical lifter, and are considered by some car experts to produce less car noise and less chance of problems. In order to understand how these new devices can benefit your car, you should understand how they operate.

The most obvious symptom of a faulty hydraulic lifter is the noise it creates in your car’s engine. You can usually distinguish the faulty lifter by the distinct sound. Instead of a knock or ping, a faulty hydraulic lifter will usually make a sound more reminiscent of a tapping sound.

Another way to quickly determine solid or hydraulic lifters is to push down firmly on the lifter end of the rocker arm. Hydraulic lifters will allow for some movement, whereas solid lifters will not budge.

A hydraulic tappet, also known as a hydraulic valve lifter or hydraulic lash adjuster, is a device for maintaining zero valve clearance in an internal combustion engine. Conventional solid valve lifters require regular adjusting to maintain a small clearance between the valve and its rocker or cam follower.

You shouldn’t drive your vehicle for more than 100 miles if you have bad lifters. The damage that bad or collapsed lifters can do to the camshaft is just too great to be ignored and repairs can cost thousands of dollars.

Roller camshafts and lifters can be used in an engine that features nonroller rockers; by the same token, roller rocker arms can be used in an engine that features a flat-tappet solid or hydraulic camshaft.