Chevrolet Automotive Racing 305 Cast iron Small Block Cylinder Heads
Start Winning More Races with our "UnderCover Ported" Cast Iron 305 Heads!
Let’s face it: Stock Chevrolet 305 heads do not perform very well on a race engine.
When we perform our magic to 305 castings air flow on a stock head is improved from 165 cfm at .400" lift to 195-200 to cfm with our “UnderCover Porting” techniques specially designed for the 305 heads. This is an amazing 35 cfm improvement at .400" lift.
Exhaust air flow on stock 305 heads is 115 cfm at .400" lift. With our “UnderCover Porting” this is increased to 140 to 150 cfm. These air flow improvements have gained over 22 horsepower on the dyno
We use a variety of 305 heads like the ‘601, ‘450 & ‘416 casting numbers. Some circle tracks require the use of a specific casting number head while in road racing the ‘081 head is often required. Our bare 305 heads start as quality, pressure tested and magnifluxed castings. They are machined for screw-in studs, pushrod holes opened, new guides are installed and sized with a Sunnen diamond hone, “UnderCover Porting” and a Serdi valve job designed specifically for the 305 heads is performed.
Note: If your rules do not allow screw-in studs or the opening of the pushrod holes,we can supply a set of heads without this work performed.
Our complete 305 heads start with all the same machining and “UnderCover Porting” as described above and are assembled with the 5000 series Ferrea valves, flat tappet springs, steel retainers, machined locks, ARP rocker studs and guide plates.
For more information on our complete head assemblies click here. Use this link for a list of options for our complete heads.
Running a 305 engine and want to win some races? Our heads are the way to fly!
| Part# | Description | Price |
|---|---|---|
| LMS-305-UC | Complete 305 heads with "305 UnderCover Porting". Assembled with Ferrea 5000 series valves, flat tappet springs, steel retainers, machined locks, rocker studs and guide plates. Flat surfaced to your specifications. | 2,195.00 |
| 305-UC | 305 castings machined for screw-in studs, pushrod holes opened, new guides & "305 UnderCover Ported". Bare, pair. | 1,495.00 |
Free Custom Camshaft: Now, with your purchase of a complete set of modified heads and a matching, modified intake, we will supply a custom ground flat tappet camshaft designed specifically for your application. The custom flat tappet camshaft, which normally would cost $185.00, will cost you nothing!
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.
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
 - Click here to sign up for the Brzezinski Email Newsletter - New! Combination SBC and LS1 Slider. We combined the bolt pattern on these 2 popular sliders to give you 2 Sliders for the price of one. - New "Look-A-LIke" retainers for the '604 Crate Motor. - New Crate Motor “Look-A-Like” Replacement Valve Springs  |