More Horsepower for your ‘604 Crate Motor
‘604 Crate Cylinder Head Modifications – The Fast Burn, Vortec Bow-Tie style aluminum heads on the ‘604 are excellent flowing stock heads. Unlike the heads on the ‘602 & ‘603 crate motors, which improve tremendously with “UnderCover Porting“, this head will not benefit from “UnderCover Porting” modifications.
Early Style “Look-A-Like” Replacement Valve Springs
More horsepower and eliminate the valve train breakage, which was common with the early style ‘604 springs. They look like the original springs, have more spring pressure and last a few thousand laps vs. a few hundred for the stock spring. #604S – 16 “Look-A-Like” valve springs for the 604 Crate Motor – $349.00.
Early style “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. #604R – 16 “Look-A-Like” retainers for the ‘604 Crate Motor – $100.00
“Look-A-Like” Machined Valve Locks #604L – 16 pair of machined valve locks. Fit ‘602, 603 & ‘604 Crate Motor – $65.00
“Look-A-Like” Bee Hive Replacement Springs The newer ‘604 crate motors have an updated Bee Hive style valves spring. Our “Look-A-Like” Bee Hive spring is made from better material and increased the spring pressure 25 lbs at .500″ lift. 16 “Look-A-Like” Bee Hive springs. $229.00
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. #604CAM3 – New Crate Master ‘604 camshaft – $475.00
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 Assemblies. Cylinder Head FAQs
Sending your cylinder heads to us for modifications? Check out our head shipping tips.