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START WINNING MORE RACES
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, solid bronze 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, 1.250" o.d 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 |
| 305-UC |
305 CASTINGS, bare, machined for screw-in studs, pushrod holes opened, bronze guides & "UnderCover Ported". |
1,495.00 |
| LMS-305-UC |
Complete 305 heads with "UnderCover Porting", 5000 series Ferrea valves, 1.250" springs, ARP rocker studs, guide plates and flat surfaced to your requirement. |
1,995.00 |
Free Custom Camshaft Offer
When you purchase a set of our complete heads with a matching modified intake manifold, a
custom ground flat tappet camshaft is included at no additional charge.
Click HERE for for details.
Call us toll free at 866-236-6300
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