4.7L CNC PORTED HEADS

Knolton first starts by hand porting the first port for best possible flow, they then put that port information into their CNC machine and replicates that best port in the rest of the runners. What you get is perfect, equally balanced port flow. This inherently makes HP in itself. For the economy heads, the stock valves/springs/retainers are inspected and replaced or reused in order to create an affordable high performance head. Dont let the stock valves/springs/retainers kid you, all parts are inspected to be within factory tolerances. These heads are no joke and will make outstanding HP gains.These heads flow so well, a custom tune is mandatory to even run right. The factory PCM can not keep up with added air flow.

Our CNC’ed ported Economy heads include:

• STOCK VALVES & STOCK SEATS
• STOCK SPRINGS – REPLACE WORN SPRINGS
• STOCK LOCKS & RETAINERS
• COMP VALVE JOB
• MILL HEAD FOR FINE FINISH
• HONED GUIDES
• CNC STAGE II PORTS

Our CNC’ed ported Race Prepped heads include:

• LARGEST STAINLESS STEEL VALVES POSSIBLE WITH STOCK SEATS
• INTAKE: 1.94 / EXHAUST: 1.50
• COMP CAMS BEEHIVE SPRINGS
• COMP CAMS RETAINERS
• COMP VALVE JOB
• MILL HEAD FOR FINE FINISH
• HONED GUIDES
• CNC STAGE II PORTS

The BOOSTED / NITROUS Heads use:

We offer the option for Boosted or Nitrous applications. These heads have all the same great stuff as the RACE PREPPED HEADS however come with a few additions specifically geared to the those who want to make the most out of their boosted 4.7L engines. The additions are, new valve seats and Inconell exhaust valves to help deal with the extreme heat caused from boost and we increase the exhaust valve size to 1.535. These heads are come ready for boost!

• LARGEST CUSTOM VALVE’S POSSIBLE NEW SEATS
• NEW HARDENED SEATS
• INCONELL Exhaust valves
• INTAKE 1.94 / EXHAUST 1.535
• COMP CAMS BEEHIVE SPRINGS
• COMP CAMS RETAINERS
• COMP VALVE JOB
• MILL HEAD FOR FINE FINISH
• HONED GUIDES
• CNC STAGE II PORTS

Check out the flow numbers below. Remember the ECONOMY HEADS get the same port work as the RACE PREPPED HEADS, the only difference between them is the RACE PREP HEADS receive larger valves and 7+ percent more then the CNC Economy heads.

STOCK HEADS HEAD

• LIFT    INT________EXH
• 10054—————50
• 200 110-————-87
• 300   146————-17
• 400 195————-135
• 500  220————-141
• 600226————-144

ECONOMY PREPPED HEADS flow approximately 12% more than the stock heads.

• LIFT     INT_______EXH
• 10058—————50
• 200 117————–91
• 300 167————-120
• 400212————-144
• 500238————-157
• 600257————-166

• LIFT     INT________EXH
• 10063—————-57
• 200117—————98
• 300175————–138
• 400233————–166
• 500262————–184
• 600271————–194

CORE PROGRAM:

If a core charge is applicable to you please make sure you select it, we will NOT ship heads without either the core charge up front. If the customer ships his/her own heads then no core charge is required. Customer is responsible for SHIPPING both ways if they chose to send their own heads for porting.

Cores MUST BE RETURNED within 3 months (90 days)of receipt of your ported heads. If we do not receive the core returns or do not hear from you within 90 days, we WILL use your core payment to replace the heads we sent to you. Effectively you lose your core deposit if this happens. Please keep us posted and make every effort to return cores in a timely manner.