crusapr
06-18-2013, 01:36 PM
CARTERSVILLE, GA - Effective immediately NeSmith Chevrolet Dirt Late Model Series Technical Staff has announced there is an update on the Chevrolet Performance Parts CT400 (604) valve spring update released June 12, 2013, and have issued the following Technical Bulletin:
604 Valve Spring Technical Bulletin #2
After a long conversation with officials of Chevrolet Performance Parts, NeSmith Dirt Late Model Series officials were informed of a miscommunication internally, and the series were given some wrong specifications. On the 604 cylinder head, Manufacturing specifications call for the heads final machine work to have a minimum install height of 1.780” minimum.
Therefore the corrected install height is 1.780”, with the install seat pressure being 98lbs. +/- 5 pounds. Please note the chart below. The only specification changing is the install height, and seat pressure. This will be rule going forward which should make the conversion even simpler for race teams and engine builders.
“We apologize for any inconvenience or confusion this may have caused teams,” NeSmith Chevrolet Dirt Late Model Series Competition/Technical Director Tim Sims said. “As a series we strive to put out the most current and correct information that is available to us, and we hope this update gives a clearer picture of the new Chevrolet Performance Valve Spring specification. If there are any questions regarding this matter, they can be directed to me at 334-864-0805 or 256-794-4047.”
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) 1.780"
Pressure @ Installed Height (+/- 5 lbs) 98 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, or visit the series on Facebook at NeSmith Racing. 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.
604 Valve Spring Technical Bulletin #2
After a long conversation with officials of Chevrolet Performance Parts, NeSmith Dirt Late Model Series officials were informed of a miscommunication internally, and the series were given some wrong specifications. On the 604 cylinder head, Manufacturing specifications call for the heads final machine work to have a minimum install height of 1.780” minimum.
Therefore the corrected install height is 1.780”, with the install seat pressure being 98lbs. +/- 5 pounds. Please note the chart below. The only specification changing is the install height, and seat pressure. This will be rule going forward which should make the conversion even simpler for race teams and engine builders.
“We apologize for any inconvenience or confusion this may have caused teams,” NeSmith Chevrolet Dirt Late Model Series Competition/Technical Director Tim Sims said. “As a series we strive to put out the most current and correct information that is available to us, and we hope this update gives a clearer picture of the new Chevrolet Performance Valve Spring specification. If there are any questions regarding this matter, they can be directed to me at 334-864-0805 or 256-794-4047.”
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) 1.780"
Pressure @ Installed Height (+/- 5 lbs) 98 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, or visit the series on Facebook at NeSmith Racing. 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.