Order 6 pairs for 20% discount. Discount refunded after purchase.

THESE ARE BARE BILLET CNC HEADS NO COMPONENTS INCLUDED EXCEPT THE BARE BILLET BLANKS. HERE ARE THE SPECS FOR OUR ASSEMBLED HEADS . ENGINE BUILDER SPECIAL

The only billet Briggs vanguard cylinder heads on the market. We were the very first to make billet vanguard cylinder heads back in 2018 and these are our latest and best version. These heads were based on oem design that was altered for racing. Large valves, better shaped/ deeper chamber, raised/ larger ports, proper short turn radius, added material under the seats and added material for the guides as well. These heads were built for using computer engine software specs. Here are the specs:

1.41 intake valve

1.20 exhaust valve

25cc optimized chamber

1.250 intake port id

1.050 exhaust port id

stainless valves

bronze guides

.500 lift single springs with titanium retainers

These heads use the same intake and exhaust flange pattern as oem heads. .040’’ was added to the chamber vs oem specs so it can be milled if needed. We run .550 lift on our engines with these heads and still have .125 piston to valve clearance unmilled. If you mill the heads .040’’ the stock intake can be used. They cannot be used on 12.5-16hp (model 29-30) blocks. Stock stamped steel (recent dimple model) rockers can be used. Tall valve covers required.

Out of the box these flow:

122 cfm @.500 lift intake . to compare a stock head flows 81 cfm

88 cfm @.500 lift exhaust .

We ported a set of heads on our model 35 shop mower engine:

140 cfm intake— supports 70 hp

110 cfm exhaust— supports 70 hp

-lash caps are required

- as good as these ports are out of the box as stated above more gains can be made by professional porting. (we dont offer that service)

-these are generic heads and should not be treated as a bolt on part. Every head should be blueprinted for each specific engine. ( spring shimming , chamber shrouding, ports etc)

-shim springs .060’’ from max lift

-7500 max rpm with the included springs. purchase beehive springs for 10 000 rpm capability

• yes the price is amazing ! Right now we are out of stock and we have put them up for pre-sale. Purchasing this means you will get a set guaranteed but we cannot guarantee a delivery date. They sell so fast that this will help us determine how many to make. No refunds