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NeSmith Chevrolet Dirt Late Model Series Technical Bulletin: Contact – TIM SIMS – (334) 864-0805 or (256) 794-4047
FOR IMMEDIATE RELEASE:
604 Valve Spring Technical Bulletin
CARTERSVILLE, GA: Effective immediately there is an update on the Chevrolet Performance Parts CT400 (604) circle track engine. As of May 22, 2013 Chevrolet Performance Parts issued the following bulletin:
Subject: Product Changes – Circle Track Engine #88958604 (aka CT400)
Effective with engine orders and shipments made on or after May 20, 2013, the following changes have been incorporated into the subject engine:
The engine part number is superseded to #19318604, due to the following component changes:
Current Part # New Parts # Description
#88958604 #19318604 Circle Track Racing Engine Assembly
#12464298 #19300955* Fast-Burn Aluminum Cylinder head Assy.*
*Cylinder head assembly #19300955 is identified by the Chevrolet “Bowtie” logo engraved on the end surface of the cylinder head. This replaces the “GM Performance Parts” logo that was formerly used. It is also assembled with Chevrolet Performance “blue” beehive-style valve springs, part # 12625033, using compatible spring retainers, seats and split key locks. These components were changed to provide maximum durability and stability at the sustained RPM typically experienced in circle track racing.
About the changes: The new version of the CT400 (8604) incorporates small changes and upgrades made to enhance engine durability. The horsepower and torque ratings of the engine did not change. Individual engine horsepower and torque ratings will vary slightly, depending on factors such as carb size and tuning; header tube size and design; fuel; oil viscosity and temperature; air cleaner efficiency; hours of operation, and atmospheric conditions, among others. As a production engine, the CT400 (8604) is assembled with clearances and dimensions that are the result of “stack-up”, or natural net sum of manufacturing and machining tolerances. This small variance may result in some engines that are “looser” or “tighter” than others, but overall, may result in engines producing +/- 3 to 5 HP compared to a similar engine.
Retro Conversion Kit:
The retro beehive valve spring kit #19300952 – Beehive Valve spring Conversion Kit is now available through your Chevrolet Performance Parts authorized dealers. The kit contains the following part numbers:
Contents: 16 - #19301707 valve spring seat
16 - #19301708 valve spring retainer
32 - #19301709 split key locks
16 - #12625033 valve spring (blue)
Attention Racer’s and Engine Builders:
The installation specifications are a considerably different than the existing springs. You will need to carefully check your install height, and NOT just simply replace one spring with the other. Please use the below install height and pressure specification, when installing these new springs. This is not a guide line it is the RULE. Don’t be alarmed by the lighter closed pressure, this is the difference between conventional valve spring, and beehive spring, and will not affect engine performance.
Valve Spring Specifications – New (Blue) Beehive Valve Spring
Description Engine 19318604
Fast Burn Cylinder Head 19300955
Valve Spring P/N -16 12625033
Valve Spring P/N –Retro Conversion Kit 19300952
Diameter Top (+/- .008") 1.060"
Diameter Bottom (+/- .008”) 1.270”
Free Height (+/- .015") 2.122"
Installed Height (Ok to shim to proper height) 1.800"
Pressure @ Installed Height (+/- 5 lbs) 90 lbs.
Open Height 1.300"
Open Pressure (+/- 13 lbs) 264 lbs.
Coil Bind 1.210"
Wire Diameter Ovate
For more information about the NeSmith Chevrolet Dirt Late Model Series visit the series all-new web site at www.nesmithracing.com. Becoming a fan of the NeSmith Racing Facebook page will make you eligible for special prizes that will be given away each month. You can follow us on Twitter @NeSmithRacing.
NeSmith Chevrolet, Buick, GMC of Claxton, GA is the Title Sponsor of the NeSmith Chevrolet Dirt Late Model Series. NeSmith Chevrolet, Buick, GMC is the nation’s number one GM Powertrain and Performance Dealer six years running, with free delivery anywhere in the Southeast. Chevrolet Performance Parts is an Official Sponsor of the NeSmith Chevrolet Dirt Late Model Series. Hoosier Racing Tire is the Official Tire Sponsor of the NeSmith Chevrolet Dirt Late Model Series. Hedman Hedders is the Official Hedder of the NeSmith Chevrolet Dirt Late Model Series and the Hedman Husler Award sponsor. Bilstein Shocks is the Official Spec Shock of the NeSmith Chevrolet Dirt Late Model Series. Old Man’s Garage is the sponsor of the NeSmith Chevrolet Old Man’s Garage Weekly Racing Series. RockAuto.com is an Official Sponsor of the NeSmith Chevrolet Dirt Late Model Series. Racecar Engineering is the Official Parts Supplier of the NeSmith Chevrolet Dirt Late Model Series. Renegade Race and Performance Fuels are a series Associate Sponsor and fuel supplier. NeSmith Chevrolet Dirt Late Model Series Contingency Sponsors for 2013 are Dominator Race Products, Stealth Racing Carburetors, Modern Images, Mike Custom Tanks, Shorty’s Shock Service, Schoenfeld Headers, J.T. Kerr Racing Equipment, Kinser Air Filters, AR Bodies, Velocita Racewear, and Performance Rod & Custom. 2013 Chassis Sponsors are Trak-Star Race Cars, Warrior Race Cars, Rocket Chassis, GRT Race Cars, TNT Race Cars, Stinger Race Cars, and CVR Race Cars.
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