All the following flowtests are unless otherwise stated in imperial figures in increment changes of 50thou. Tests were done on a Superflow 110 machine and are cubic feet of air per minute or cfm for short. Many figures are from the Janspeed flowbench, since purchasing my own I am gradually changing the results over, You may well see quite a flow difference between the 2 benchs but the headwork remains the same so do NOT be alarmed. The Janspeed machine is 20yrs old while mine is new and each ones readings are what they are. I will state 'My bench' where the figs are from my bench.

ROVER/MG - LOTUS/CATERHAM/GTM using the K16 /KV 6, Motorsport & Vulcan heads.
Rover K series engine 14/16/1800cc. First line of figures are the standard K16 as factory produced / non VVC. Inlet flow 27.8mm valves

17.9   38.4   57.3   79.2   80.8   83.9   86.1   86.6

Rover X power figures 27.8mm valves. 1400cc only. All std parts.

19.4   38.3   57.2   75.6    87.9   91.1   92.6   93.8   94.8

Rover X power figures 27.8mm valves. 16/1800cc. All std parts.

19.4   39.7   61.3   79.9    90.5   93.7   95.2   95.2   95.2

Lotus 135R figures 27.8mm valves. 1800cc. All std parts.

18.9   39.3  58.3    76.7    88.7   93.4   94.5   94.5    94.7

Lotus S160 figures 27.8mm valves. All std parts, CNC machined. 1800cc.

18     37.4   52.6    67.7   80.9    91.7   98.7   101.8  103.4

SABRES conversion 27.8mm valves. All std parts. 16/1800cc

19.3   40.1   61.3   80.6   92.4    96.6   99.2    99.7    99.9

SABRES STANDARD conversion using longer Calsibro guides. 27.8mm valves.16/1800cc.

19.4  40.1   61.2   80.9   95.9    98.2   100.2   103.4  103.9

KR1 conversion, using Sabres own 29.8mm performance valves. My bench.

20.6  43.6   66.9   87.5  100.5  105.1  107.9   108.9   110.2

KR1 conversion, using Sabres own 29.8mm performance valves BUT fitting a larger seat insert for a touch more toplift flow. My bench.

20.3  43.5   65.8   85.9  100.5   107.2   111.4   113.4   113.5

Sabres KR1 'Half' conversion using a SINGLE 29.8mm valve per cyl. Sportomotive Elise.

20    42.3    64.8   86.1  100.8   105.2  107.9   108.7  108.7

Sabres 'Hybrid' conversion using a single 31.5 on new seat insert/27.8 std mix per cyl.

20.6  42.8   64.6   87.1  102.9    112    114.8    117.2   117.9

Sabres standard conversion 30.5mm valves + new seat inserts. Liam Crilly's Elise.

21.9  45.4   68.9    91    107.5    114.5   118     120.9   122.3

Sabres conversion using Std VVC 31.5mm valves + new seat inserts. Robin Iddons Elise.

22.1   46.1  69.9   92.8   111.3   118.9   124.6   127.4   128.8

EXHAUST flow figs, starting with the std factory produced K16 non VVC, 24.2mm valves. Due to Rovers irregular machining/casting the exh port flow can vary considerably accross just a single heads 4 cylinders let alone from head to head!!!

14.4   28.9   41.5   52.7   59.6    64.7     65.5     66.2    66.2

Rover X power figures 24.2mm valves. 1400cc only. All std parts.

16.5   34.9   53.5    64.9   69.1    72.2    72.8     73.5    74.4

Rover X power figures 24.2mm valves. 16/1800cc. All std parts.

16.6   35.9   55.1    69.1   70.2    72.1    72.4     73.1    73.9

Lotus 135R figures 24.2mm valves. 1800cc. All std parts.

16.6   34.2   47.2    64.7   72.9    75.5    77.5    78.4    78.8

Lotus S160 figures 24.2mm valves. All std parts, CNC machined. 1800cc.

14.7   29.5   43.6    53.9   62.7   67.7    70.3    73.1     74.4

SABRES conversion 24.2mm valves. 16/1800cc. All std parts. My bench. NOTE the second set of figs below first are as the Janspeed gave so you can see how they differ.

16.1   32.8   49.8    63.2   67.3   69.3    71. 4   73.9    76.1 Mine

16.3   37.5   55.1    69.7   75.3   77.3    77.7    78.5    79 Janspeed

Sabres conversion using custom 25.5mm valves. 1800cc. Robin Iddons Elise.

16.7  37.6   55.7     71.2   79.4   85.1     86      88.5    89

VVC and MOTORSPORT (Often incorrectly called VHPD)

The motorsport casting was made by mixing the Std k16 'Casing' with the VVC ports/chamber elements to create a high flowing head which is lighter/ requires no complicated/expensive blanking kits/can use simpler existing cams- the VVC Inlet No.1+6 bearing are a greater dia, needed to take the mechanism load- this adds weight, is a more expensive blank cam, plus limits using the option of fitting cheap s/hand cams. First line of figures is the Std Inlet flow. 31.5mm valves. All std parts.

19.3  39.7   62.1   82 9   97.1  106.5   109.9   112.7   113.4

Later 160hp spec VVC. 31.5mm valves. All std parts, barely improved flow over 145hp version.

21.1  43.9   65.2   84.2   98.5  104.9   111.3   113.4   114

PTP produced 'Vulcan' casting, this I had a hand in developing as talked of in homepage text.

21.3    44    67.1   87.1  103.4  111.9   115.9   118.9   120.4  120.7

SABRES standard conversion 31.5mm valves. All three casting types(Not Vulcan). All std parts. My bench.

21.7   44.5   66.5   89.9  107.6  118.7  123.6   126.8  129.3   130

SABRES conversion non R.e.c 32.5mm valves. On std seat insert.

22.6   46.6   70.4   92.6   112    126.5   136.3   139.9   143

SABRES BIG VALVE conversion using Sabres own 33.3mm valves on an 82mm bore, as used in 1900. This engine produced 250hp/170+ft torq.

23.2   46.5   70.6   94.4   114.3  130.4   140.1  145.6  150.2  153.1

SABRES BIG VALVE conversion using Sabres own 33.8mm valves on an 82mm bore, coming soon

JUDD BRITcar , yes the real thing! 34.4mm valves, tested on 82.5mm bore.

22.6   44.3   66.9   87.5   107.7  125.3   139.3  148.9  155.4  159.1

EXHAUST flow, 143hp VVC/Motorsport casting. Std flow- 27.4mm valves. All std parts.

17.1   35.3   52.7   64.3   70.1   73.4   74.7   76.4   78

Later 160 spec VVC. 27.4mm valves. All std parts. Barely improved flow over 145 version.

17.2   36.7   53.5   66.4   73.4   76.8   78.4   79.1   80

Vulcan casting, 27.4mm valves.

16.9   36.2   51.8    67.4   78.1    83.5    88.2    89.8   91.2   92.3

Sabres standard conversion, 27.4mm valves. All three casting types(Not Vulcan). All std parts.

19.1   41.1    59.3   77.1   88.2    94.5    98.7  100.3  100.9  101.7

SABRES BIG VALVE conversion using R.e.c's 28.5mm valves on an 82mm bore, as used in a 1900. This engine produced 250hp/170+ft torq.

20.9   43.3    61.9   78.1   91.4   100.2   105.8   109.8   112   112.7

JUDD BRITcar, 28mm valves, tested on 82.5mm bore.

19.5   40.1    56.9   71.3   80.1     89.3    95.2    99.47   102.2  105.26