CHRF

 

Street Rodder, Sand Car & Kit Car PRICING

HEAD PACKAGE

Includes; porting and polishing to our specs, 3 angle valve/seat grind, 4 reground cams, new HP springs, retainers, seals and intake cam sprockets redrilled  Call for pricing.  Choose the cams from the CAM page.

 

 Want a little more power?  There are some minor problems with any production head.  When the valve seats are machined, there is a sharp corner left on the short side.  We radius this corner along with doing some work in the intake port.

Take a look at the chart for flow rate comparisons.  Head work with our cams will really wake up this engine.  Figure an increase of 50 cfm will produce 100 HP.

With our hand fabricated or cast manifolds, we can open up the intake ports to flow the numbers you are seeing in the chart below. If you are going to use the stock plastic intake, the numbers are slightly less.

                             

Flow in cfm at 28"

Lift                                 Stock 4.0L                       Stock 4.6L                               Mod 4.6L                            

                                       Int         Exh                        Int         Exh                               Int        Exh

.050                                26          29.6                   39.2      28.8                             40         29.2

.100                              75.2         67.9                   81.1       67                              83.5        59.2

.150                            110.7         94.5                 121.8      98.4                         123.7        92.3

.200                            143.6       109.1                 157        122.9                        159.5       120.9

.250                            170.9       118.6                186.4     133.9                         190.5       137.5

.300                            193.3      125.7                 208.5      141                            218        150.2

.350                            207.5      130.9                 218.3      146.2                         239.4     159.9

.400                            211.6      134.1                 218.9      150                            255.5     176.3

.450                            215.1      138.5                 222.4      152.8                        265.7     182.6

.500                            217.3       42.1                 225.2      154.8                          273.2    187.2

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