Circle Track Crate Engine Technical Manual - Chevrolet Performance

Tech Inspection Procedures Continued
One of the earliest series to embrace the circle track crate engine program was the USPRO Series,
now known as the ASA Late Model Series. GM Racing and GM Performance Parts has worked
with them to provide some of the procedures listed below. Refer to the actual instructions from
each manufacture for 100% accuracy of the test procedures. These are only guidelines.
P&G Procedure: www.precisionmeasure.com
The P&G tester is one of the best “on site checks” of checking engine displacement. It provides a
means to check engine displacement without tearing down the engine.
Note: Engine temperature is critical with this test.
Whistler Procedure: www.katechengines.com
The Whistler is used to check compression ratio. It’s a tool used to check compression ratio of
completely assembled engines at the track.
Note: Engine temperature is critical with this test.
Valve Spring Inspection: www.moroso.com
Valve springs are an area that teams try and increase the spring pressure to increase PRM limits of
the engine. This sheet covers a quick way to check spring pressures on the engine. Refer to the
spring chart for proper specifications. Moroso P/N 62391 spring rate checker.
Rocker Arm Testing: 604 engine only. Contact local GM dealer
GM sells a rocker arm checking fixture. It’s a simple fixture for testing the roller rockers on the
604 engine. This page covers how to check for correct rocker ratio. The p/n for the fixture is
88958663.
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