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Pro 158 - with Pro Swirl Technology |
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| Application |
Honda K20/K24 (CRV K24A1, Type S K20A2, Type R K20A) |
| Recommended Use |
- Pro All Motor, All Motor Street
- USAC Midget
- High HP open class Road Race
- 2.4L+ Displacement Engines with the intent to achieve 350-400 DynoJet horsepower.
- E85, Methanol, Gasoline
- Not recommended for high boost applications
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| Features and Benefits |
- Slow-cut precision porting by Weld Tech, the people who invented CNC head porting.
- Custom 50 degree intake valve that outperforms other off-the-shelf valves.
- Full length bronze manganese guide for valve stability.
- Unique power producing exhaust port design.
- Pro Swirl Intake Port Design - This is a staggered intake port design that promotes swirl into the chamber for better fuel burn.
- Need to port match to your Kinsler induction? Simple...just tell Kinsler you have a 4 Piston 158 and they will CNC match your induction to this port entry.
- Our heads are all shipped with installation tips, a sheet of desired clearances for setting up your engine, and a flow chart from your head.
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| Intake Runner Volume |
158cc |
| Intake Valve Size |
37mm |
| Exhaust Valve Size |
30mm |
**Core Required
***Check your piston spec sheet. You need a 1.500" or larger intake valve pocket diameter to run a 37mm valve. Many popular Wiseco and CP pistons come standard with this valve pocket. Call or email for further instruction.
****This port was designed to work with a 37mm valve. We can taper the bowl area to accomodate a 36mm valve, but we recommend our smaller 156cc port if you are limited to a 36mm valve.
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Pro 158 CNC Cylinder Head
-CNC Ported intake and exhaust ports
-Manganese Bronze Valve Guides (16)
-Oversized Intake Seats (8)
-Racing Valve Job
-Resurface
-NO VALVES |
$1675 |
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Pro 158 CNC Cylinder Head
-CNC Ported intake and exhaust ports
-Manganese Bronze Valve Guides (16)
-Oversized Intake Seats (8)
-Racing Valve Job
-Resurface
-Custom 37mm 50 degree Intake Valves (8)
-Ferrea 6000 30mm Exhaust Valves (8) |
$1950 |
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Copper Beryllium Intake Seat Option
Because of the cisis in Japan, these seats are now an upcharged option. When the price on the material comes back down we will adjust accordingly. We have these in stock if you prefer them over steel.
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$125 |
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| Porting and head package prices assume a disassembled and clean cylinder head. Refer to pricing below if you need your cylinder head disassembled, cleaned, and reassembled |
Disassemble |
$50 |
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| Hot Tank and Soda Blast |
$50 |
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| Assemble |
$50 |
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Ship Heads to:
4 Piston Racing
1298 E. US Hwy 136, Suite B
Pittsboro, IN 46167
Please include any special instructions and contact information. You may also send a check for payment, or it can be taken care of with a credit card or PayPal. |
Lift |
Intake CFM |
Exhaust CFM |
.200 |
164 |
134 |
.300 |
241 |
183 |
.400 |
311 |
216 |
.500 |
352 |
230 |
.550 |
360 |
231 |
.600 |
364 |
233 |
.650 |
368 |
237 |
| Superflow 600 @ 28" |
Jeff Rosario - Quickest All Motor EK - 381whp 265wtq - 10.22 @ 130
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Pejeter's EG - 2180 lbs, 10s @ 128 mph on 99x89.5 street motor
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