Offered here is the best fitting,
easiest to install Lumps on the market. These lumps will add 10% flow over any
other modification done to your head. This will show in the Torque and HP
achieved across the entire RPM range. Better mileage!
It is recommended to use at least a 1.84-1.94 intake valve in combination with these lumps for best effect.
Standard HI-FLOW Bolt in lump kit
Lump Port Kit
Each lump is hand fit
into a intake port.
This is a complete bolt in lump kit, fits
194/215/230/250/292. Included is:
3 1/2" head
3 bolt boss
3 8/32 bolts to secure
and video instructions.
Inline Cylinder Head Flow
Here are 3 flow tests, first on stock head with 1.72
intakes, second on
bolt boss removed with 1.84 intake valve, third is
same port with a bolt in
This is a head with 1.84 intake
valves . It has had valve unshrouding done to it and the guides have been coned
First port is a intake that has had the bolt boss removed and has
a cap screw sitting in the bottom, like it would be in use. 1.84 intake @28"
on a superflow lift flow open port no lump .100 62.1cfm .200
115.3cfm .300 168.7cfm .400 184.3cfm .500 195.6cfm .600 202.0
same port with bolt in lump .100 lift 59.3 cfm .200 lift 112.9
cfm .300 lift 166.9 cfm .400 lift 203.9 cfm .500 lift 215.6
cfm .600 lift 226 cfm
Bolt in lumps work! Even with what some
people say are small valves, these heads flow very well. Flow tested at a
reputable performance shop. This head shows excellent flow at midlift and full
lift values. The I/E ratio is 72% which is also nice to have in a naturally
So you want to really know what all this AIRFLOW does for your engine. Look
at the chart to the right. The graphs are made up of real dyno runs made on a
The Bolt in Lump Kit is equal change in power as a cam change. When combined
with a cam change, gains of over 100 hp can easily be achieved with a mild cam.
To compare the blue lines(stock head) to the green lines (lump port head.
Stock head was 1.72/1.5 valves , no porting.
Lump port head was , 1.94/1.6 valves, ported and lumped.
Same cam was used on both runs. See the tq increase at low RPM? See how the
HP was much higher and over a longer RPM?
The other graghs represent the same thing with a performance camshaft.
6.00 shipping to USA
lower 48 states. Out of country Brazil and Canada look below