The cylinder heads on the '603 crate motor really suck; they should be on something mowing lawn at your local golf course not on your race motor.  So, if you want to get a huge advantage over the guy next to you, get these "lawn mower" heads reworked.  Or, don't get them modified and run just like the rest of the field.

The stock intake port flows just 188 cfm - that is worse then stock '492 "double hump" style heads. With UnderCover Porting" the intake air flow is improved to over 215 cfm.

The ZZ4 '603 crate motor uses the camshaft, springs, retainers and locks as the '604 crate motor and valves from the Vortec '602 crate.                                                                                                                                                                                                                                                                                                                                                            '603 ZZ4 Cylinder Head / Camshaft Package: "UnderCover Porting" to your complete '603 cylinder heads. Heads will be assembled with our "Look-A-Like" intake valves, valve springs, retainers, locks and we will regrind your used '603 camshaft. If your camshaft is brand new we will simply swap it for a new '603 Crate Master Camshaft. Total package price: $1,849.00. 

	"Look-A-Like” Replacement Valve Springs More horsepower and eliminate the valve train breakage. They look like the original springs, have more spring pressure and last a few thousand laps vs. a few hundered for the stock spring.	#603S - 16 "Look-A-Like" valve springs for the '603 & 604 Crate Motor - $339.00.
	"Look-A-Like" Crate Motor Retainers No more retainer breakage with our chrome moly retainers!  Same look as the original retainers and a lot stronger.	#603R - 16 "Look-A-Like" retainers for the '603 & '604 Crate Motor - $80.00
	"Look-A-Like" machined valve locks for crate motors	#603L - 16 pair of machined valve locks. Fit '602, 603 & '604 Crate Motor - $55.00
	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.	#BRP603-194 - Set of 8 Look-A-Like intake valves for the '602 & '603 crate motor - $140.00.
	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.	#603CAM3 - New Crate Master '603 camshaft - $425.00

Cylinder Head Design Form: Fill out our online form for a recommendation and pricing on a set of heads built specifically for your application. Also, here is a link to more detailed information on our Complete Cylinder Head Assemlies.

Cylinder Head FAQ'S

Sending your cylinder heads to us for modifications?

Brzezinski Racing Products, Inc. The #1 Name in Cast Iron. Call us toll free at 866-236-6300