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For Sale: Dart Pro1 LS3 Heads, 6-Bolt (Bare "As-Cast" Price)

Also as CNC Ported, Fully Assembled to Suit



1545 Mound Road, Rockdale, IL View Map


Our Whipple supercharged, water-meth injected LS3 in the photo was installed in a GMC Syclone and featured by Dart on their booth at Holley's LS Fest.

Be sure to check out the video to actually look down the throat of the throttle body during a dyno pull with spray activated.

Needless to say, the Dart Pro1 heads we put on this bad boy got some CNC love before we bolted them on.

We typically have both "as-cast" and CNC ported varieties in stock for immediate shipment. We also typically have the various valve and spring combinations on he shelf so fully-assembled can go same-day as well.

Borowski Race Engines, Inc. was first in line with Dart for these heads and we have shown what they can do with big-time power adders. Give us a call to pick out your best optioned Dart Pro1 heads.

Buy your parts from people who use them!
Above Added: Sun October 23, 2016, 6:17 am EST
We have these bare heads in stock both as-cast and CNC ported. The as-cast bare price is $1,630 as shown in the ad. Our custom CNC ported version is $750 higher in price ($2,380). These heads also have been treated to a CNC valve job on our Newen Contour seat & guide machine. In our testing, this combination of additional CNC work added about 30 hp over the as-cast, out-of-the-box version.

Our preferred vendor for the valves, springs, etc is Manley. If you want the heads fully assembled, the parts and costs are:

Manley Severe Duty (Race Series) Intake valves $247.
Manley Inconel exhaust valves $482.
Manley NexTek springs, machined bead locks, steel retainers and locators $440.88.
Total Parts = $1,169.88

The assembly and shipping are no charge. We have both the as-cast and CNC ported heads in stock along with all the Manley hardware. Whatever version you want can be out the door today either bare or assembled.

To summarize, the cost for a set of these fully assembled heads, as-cast, is $2,799.88; fully assembled CNC ported heads are $3,549.88 plus any applicable tax.
Above Added: Thu November 19, 2015, 4:47 am EST
Pricing is for a pair of bare heads, as received from Dart. Please call for options regarding fully assembled or ported heads.
Above Added: Mon August 10, 2015, 8:49 am EST
Dart's long awaited 6-bolt LS3 heads have arrived! We here at Borowski Race Engines received the first set shipped, paired the heads with a Dart LS Next block and added nitrous. Engine Labs online magazine ran the story as a tech feature

Quoting the article": "By creating a cylinder head casting that performs like a ported design right out of the box, Dart has developed a serious advantage—especially when you take the price point of these cylinder heads into account, which Maskin says will hit the marketplace approximately $200 less per head than competing designs, while offering better performance."

LS3 Style cylinder head
Available Bare or Complete (call for options and pricing)
LS3 Exhaust port locations and bolt pattern
2.165-inch Intake Valve, 1.600-inch Exhaust Valve
RMR virgin heat treated 355-T61 cast aluminum material
280cc intake runners, 102cc exhaust runners
Accepts OEM or LS3 aftermarket intake manifolds
Accepts OEM or aftermarket LS3 valve-train
0.500-inch thick decks for stability in boosted and nitrous applications

Dart's all-new Pro1 LS3 cylinder head features the latest in port and combustion chamber design. The company's investment in casting and tooling capabilities allows them to produce a cylinder head design that is unrivaled in the market.

Assembled cylinder heads are available with 1.290-inch beehive or 1.295-inch dual valve springs to suit nearly any application. The valve seats feature a five-angle design for the intake valve and a three-angle design for the exhaust valves to promote excellent flow.

Cylinder heads work on LS and LS Next-style blocks with a four or six-bolt configuration for maximum clamping ability.
Racing inspired combustion chamber improves flame propagation and increases air flow.

Dart has designed these as-cast cylinder heads to perform like ported cylinder heads--maximizing performance and minimizing your investment.

Internal Borowski testing with these cylinder heads prove they are capable of well over 1,000 horsepower and 1,000 pound feet of torque.

Part Number 110300000-11030153
Material RMR virgin heat treated 355-T61 cast aluminum
Combustion Chambers 68cc
Intake Valve Diameter 2.165-inch
Intake Port Volume 280cc
Intake Port Dimensions Stock LS3 location and bolt pattern
Intake Port Location Stock LS3 location and bolt pattern
Intake Gasket OE or Fel-Pro LS3
Exhaust Valve Diameter 1.600-inch
Exhaust Port Volume 102cc
Exhaust Port Dimensions 1.750-inch x 1.550-inch
Exhaust Port Location Stock LS3 port location and pattern
Exhaust Gasket OE or Fel-Pro 1438
Flow, Intake 370 cfm @ .800-inch lift, 28” water
Flow, Exhaust 252 cfm @ .800-inch lift, 28” water


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Ad #182536238
Expires on: 10/30/2016
Posted: 10/23/2016, ad expires in 6 days
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Ad posted by:
BorowskiRace (#327877)

Borowski Race Engines, Inc.
1545 Mound Rd
Rockdale, IL 60436
(815) 725-2727

Member Since: 10/23/2008
Phone Number: 815-725-2727

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Execution Stats: 0.140 sec / 8.2 MB used / 8.3 MB peak