Automotive Small Block Chevrolet Racing Crate Engine Heads
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Home : Cylinder Heads : Crate Heads
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Wake Up Your Crate Engine
Vortec Cast Iron Heads
The '062 or the '906 Vortec heads are standard equipment on the part number 88958602 350/350 Crate Engine.
Recently, we reworked a couple sets of these heads. We flow tested the heads with the stock Chevrolet valves before and after our "UnderCover Porting". Here are the results:
Lift |
Stock Exhaust |
"UnderCover" Exhaust |
Stock
Intake |
"UnderCover"
Intake |
.100 |
45 |
42 |
64 |
60 |
.200 |
96 |
97 |
122 |
122 |
.300 |
131 |
138 |
175 |
175 |
.400 |
145 |
158 |
209 |
211 |
.450 |
148 |
162 |
206 |
217 |
.500 |
153 |
167 |
202 |
222 |
.550 |
154 |
170 |
203 |
224 |
More improvements will be gained with aftermarket valves.
Part#434PRO-VT - "UnderCover Porting" to 1 bare pair of Vortec heads - $835.00
Part#434PRO-VT-C - "UnderCover Porting" to 1 complete pair of Vortec Crate Engine heads. Includes disassembly, grinding valves, surfacing heads, "UnderCover Porting", cleaning all parts, and assemble. $995.00.
Part#LMS-VT-CRATE - Complete Vortec Crate heads with "UnderCover Porting".
Assembled with all of the stock Chevrolet parts. $1595.00.
ZZ4 Aluminum Heads
These heads are found on the 350/355 Crate Engine, Chevrolet Part# 88958603. This engine is supplied with a .474" intake / .510" exhaust lift camshaft.
At .450" lift 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 a bit over 200 cfm at .450" lift.
Part#434PRO-ZZ4 - "UnderCover Porting" to 1 bare pair of ZZ4 heads - $835.00
Part#434PRO-ZZ4-C - "UnderCover Porting" to 1 complete pair of ZZ4 Crate Engine heads. Includes disassembly, grinding valves, surfacing heads, "UnderCover Porting", cleaning all parts, and assemble. $995.00.
Other performance ideas for the crate engine:
Ferrea light weight hollow stem valves and Acid Porting to your intake manifold.
Call us toll free at 866-236-6300
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