Chevy 602 Crate Motor

Add 36 Horsepower to your Vortec Head ‘602 Crate Motor! Turn your ‘602 Vortec head crate motor into a contender with our “Look-A-Like” parts and “Undercover Porting”.


UnderCover Ported” cast iron Vortec head from the ‘602 Crate Motor.

The ‘602 crate motor has Vortec cast iron heads that are produced in Mexico.  They are very poor flowing cylinder heads, even for this somewhat “limited” application.   However, they do respond to our “Undercover Porting” procedures. How much does “UnderCover Porting” help the cast iron Vortec head ‘602 crate?

The stock ‘602 Crate engine produced 349 horsepower @ 6,000 rpm. With our “UnderCover Porting” and “Look-A-Like” intake valves, valve springs, retainers and locks the same motor made 363 horsepower @ 6,000 rpm. Torque also increased 18 ft.lbs at 5,500 rpm. Next, we installed our Crate Master Camshaft.

The lobe centers and duration of the cam have been changed to improve performance; the valve lift was not changed. With our Crate Master camshaft the motor made 385 horsepower @ 6,000 rpm. Torque increased another 9 ft. lbs at 6,000 rpm. The combination of “Undercover Ported” heads and our ‘602 Crate Master Camshaft improved the motor 36 horsepower and 31 ft.lbs of torque.

‘602 “UnderCover” Cylinder Head Modifications: We can modify your bare or complete ‘602 cylinder heads.  Or, supply you with brand new heads that are ready to bolt on the motor.

Send us YOUR complete ‘602 Vortec heads.  We will take them apart, perform our “Undercover Porting” to the intake & exhaust ports, modify the chambers, machine the valve seats, surface and reassemble the heads with our “Look-A-Like” intake valves, valve springs, retainers and locks. Cost is $1,440.00 to totally rework YOUR complete ‘602 heads.

“Undercover Porting” to YOUR bare ‘602 castings: Includes: “Undercover Porting” to the intake & exhaust ports, modifying the chambers and machining the valve seats.  Cost is $850.00 to YOUR bare ‘602 castings.

Complete Brand New Chevy ‘602 Vortec Heads:  The same new Chevy castings that come on the ‘602 crate motor.  They are “Undercover Ported” and assembled with our  “Look-A-Like” valve springs, retainers, locks and intake valves.  Ready to bolt on.  $2,095.00.

We can also regrind your 602 camshaft for $165.00, or purchase a brand new camshaft ground on a new Chevy cam core listed below.

Bulletproof your ‘602 Crate Motor Valve Train

On the ‘602 crate motor, we are concerned about the valve spring pressure, or lack there of, on the intake valve.  Why the intake valve and not the exhaust?  Well,  the intake valve is heaver and will “float” before the exhaust.  Anything you can do to increase the effective valve spring pressure will help keep the intake valves out of this destructive “float” condition.  The “intake valve float” condition is made more problematic because the stock ‘602 valve springs tend to “go away” so quickly, especially if you are trying to run the motor over 6,000 rpm.

We have a couple solutions.  First, you can simply install our Look-a-Like ‘602 retainers and locks.  This will reduce the springs installed height and increase the effective spring pressure.  This can be done with the stock springs.  Or, a better solution is to also replace the stock valve springs with our Look-a-Like valve springs.


10 cfm air flow gain at .200″ & .300″ lift vs. the stock intake valve. Look-A-Like intake valve for the ‘602 & ‘603 Crate Motor. Same look, length and weight as the stock intake valve. 
#BRP602-194 – Set of 8 Look-A-Like intake valves – $160.00.

Look-A-Like replacement valve spring for the ‘602 Crate Motor. Same wire diameter, length and installed height as the stock spring. Our Look-A-Like ‘602 valve spring will give you a bit more spring pressure and the piece of mind of thousands of laps.
#602SSS – Set of 16 Look-A-Like valve springs for the ‘602 Crate Motor – $229.00.

The stock Chevy retainers are made out of cheap low-carbon steel. Low-Carbon steel works for production street cars but is inferior for racing applications. Our Chrome Moly heat treated Look-A-Like retainer will not break like the stock retainers have been know to do.
#602R – Set of 16 Look-A-Like retainers for the ‘602 crate motor – $95.00

Foto Space holder 
Machined locks for the crate motors
#602L – 16 pair of machined valve locks.  $60.00

4 hole rev
1″ tall aluminum 4 hole “Reversion Step” carb spacer designed for ‘602 Crate Motor – 10 ft. lbs of torque improvement over an open spacer.   111-RS – 1″ tall carb spacer – $75.00



Our Crate Master camshafts are ground on original Chevy camshaft cores. The duration and lobe centers are changed; the valve lift is the same as stock.  #602CAM3 – New Crate Master ‘602 camshaft – $329.00



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