Engine Quest CH350I Cylinder Heads

Engine Quest CH350I Cast Iron Heads

“UnderCover Ported” EQ head will be 20 horsepower better than a stock EQ head.

The stock EQ-350I IMCA cylinder head is a good basic cylinder head from a mechanical stand point.  From a performance standpoint, on a typical circle track car, there is a ton of room for improvement.

If you want to run in the middle of the pack, bolt on a set of these heads without improving the air flow. If you want to run upfront, “Undercover Porting” is the way to go.

Stock EQ-350I heads flow 215 cfm intake and 154 cfm exhaust. With our “Undercover Porting” the flow numbers increase to 237 intake and 175 exhaust.  This air flow improvement will typically add close to 20 horsepower to your 355 small block running a 500 Holley 2 barrel carb.


Complete Brzezinski Racing Products “UnderCover Ported” 350I heads. Want a head capable of running in the top 3 at any race track in the country? If so, this is the way to go.

EQ350I with “Undercover Porting”

New EQ350I pressure tested castings, CNC machining, modifications to the intake ports, exhaust ports and combustion chambers, cover-up work, install & size bronze valve guide liners for 11/32” valves, valve seats machined to 1.94” x 1.50” or 2.02” x 1.60”.  $1,595.00 per pair of bare, new castings.

LMS-350I-UC 

A complete set of the EQ350I heads with the above listed “CNC-UnderCover Porting”, 11/32″ REV stainless valves, PAC or Isky 1.250” springs, hardened spring locators, steel retainers, machined valve locks, ARP rocker studs, guide plates, flat surfaced to your compression rule and assembled, ready to bolt on sells for $2,695.00.

EQ350I Top End Package: Above listed complete set of LMS-350I-UC cylinder heads PLUS stock 2701 Edelbrock intake manifold machined to fit heads,  intake manifold gaskets, carb adapter or spacer and a custom ground flat tappet camshaft, ready to bolt on sells for $2,995.00.

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Yes, we can modify YOUR bare EQ 350I castings

The cost to perform our “UnderCover Porting” to a bare pair of YOUR clean, ready-to-be-worked-on EQ 350I castings is $995.00 plus shipping.  This includes the CNC machining, modifications to the intake ports, exhaust ports and combustion chambers, cover-up work, install & size bronze valve guide liners for 11/32” valves, valve seats machined to 1.94” x 1.50” or 2.02” x 1.60”.  $995.00 labor only plus shipping to YOUR bare castings. Yes, we can also modify YOUR complete 350I castings.

We pickup 10 cfm @ .200″ lift & close to 20 cfm @ .500″ with our “UnderCover Porting”. This translates into a solid 15 to 20 horsepower gain on a 355 small block running a Holley 500 2 barrel.

Measurable exhaust air flow improvements start at .200″ lift and continue to a 14 cfm gain at .500″ lift with our “UnderCover Porting”. Going to a 1.60″ valve improves the exhaust air flow even more.


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