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A cylinder head conversion can make holidays a pleasure!
A cylinder head conversion can make holidays a pleasurE...
Performance valves
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Cylinder Head Conversions, Modifications & Upgrades for motor cars, 4x4s, trucks / bakkies, SUVs & bikes, petrol & diesel

Cylinder Head Conversions, Upgrades & Modifications
Motor Cars, SUVs, Trucks / Bakkies & Bikes | Petrol & Diesel

View our recent most popular Stage 1 (chip, exhaust & branch), Stage 2 (Cylinder head) and Stage 3 (Supercharger) conversions.

The Cylinder Head

The cylinder head is the most important area to consider by the serious tuner. Contact the Expert at the SAC Branch near you if you have questions about cylinder head performance conversions.


Cylinder heads will always be the key component of performance enhancement packages on any normally aspirated or diesel engines on motor cars, trucks / bakkies, SUVs as well as bikes.
Its design has more bearing on the end result, performance-wise, than any other component of the high-performance engine on motor cars.
There is no way in which high horsepower can be obtained if the head won't flow efficiently, and in turn burn that air / fuel mixture efficiently.
Many tuners go to extremes, cramming as much air into the cylinder as possible, only to have a combustion chamber that wont burn the mixture efficiently.
Airflow figures tell very little about how well a head has been modified.
There is no point in getting a lot of mixture into an engine unless you can manage to burn it at the right time, and if you try too hard to get high flow figures, you can easily end up with a combustion chamber that won't burn effectively.
A gas flow rig is an aid in head development,  but it is possible to look at a port and decide whether or not air would like to flow through it.
A port that is nice and straight and has no projections will generally flow well.
Until recent times many engines had a head design so horrible that to create an improvement was relatively simple. 
It has always been thought that there is a direct relationship between high airflow numbers and high power output. 
In principle this theory sounds correct, but in practice it does not always work out that way.
At one time a factory racing department picked the best high-performance heads off the production line for modification.
After being ported, each head was flow checked.
The heads that recorded the best results were kept for the factory racing team, and the supposedly inferior heads were sold to selected privateers. 
The interesting thing is that on the dyno, the engines with the heads that produced the best airflow figures actually recorded power outputs no better than engines with average flow heads.
After this discovery the factory tested all their heads for power output, before any were released to the private teams, and they found that some of the "average" heads they had been selling produced the best power.
If the valves are enlarged and the ports are hogged out to the limit, you will get big power. It is amazing how many people are trapped by this fallacy.
The Conversion Misconception
Most people seem to think that a cylinder head conversion means fitting a different head to a vehicle or modifying the original one beyond recognition, turning a perfectly running leisure vehicle into a racecar or a unreliable lumpy idling impossible to drive monster.

Unfortunately this does happen out there but we at SAC have a completely different approach...

Read more about:
1. Cylinderhead conversions for enthusiasts
2. Heads for bikes and quads
3. Diesel cylinderhead conversions
4. The SAC power strategy
5. Performance valves
6. Popular diesel conversions
7. Popular petrol conversions

Engineering Services
- Cylinder Heads -
· Gasflowed heads for most Petrol and Diesel vehicles
· Full reconditioning of all heads
· Flowbench developed heads
· Full race heads
· Big valve head conversions 
· Solid lifter head conversions
· Motorcycle heads
· Lineboring
· Pressure testing
· Aluminium and Cast iron welding 
Cylinder head conversions for bikes as well!
Cylinder head conversions for bikes...
Gasflowed Cylinder Heads
GAS FLOWED Cylinder headS...
Gasflowed Cylinder heads >> CONVERSIONS For the Enthusiast >> conversions for diesel VEHICLES >> SAC Power Strategy >>
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Popular Petrol CYLINDER HEAD Conversions >> Popular Diesel CYLINDER HEAD Conversions >> CYLINDER HEAD CATALOGUE >>
Cylinder head conversions, modifications and upgrades are available for Alfa, Audi, BMW, Chev, Chrysler, Colt, Ford, Honda, Hyundai, Isuzu, Jeep, Kia, Mazda, Mercedes, Mini, Nissan, Opel, Toyota, Volkswagen and more...
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* All Test Figures displayed on this website were obtained at Highveld altitude. These figures may differ from vehicle to vehicle.
The power figures have been corrected back to flywheel power.

*Although we make every attempt to provide current, correct information on our website, mistakes do sometimes happen and we apologize for any confusion that may occur due to any error.
Prices are subject to change without notice and we reserve the right to uphold current in store pricing.
** All Prices quoted on this website were correct at the time of publishing and actual prices may vary.

* All manufacturer's names, numbers, symbols & descriptions are for reference purposes only.
It is not implied that any part, conversion or modification is the product of these manufacturers.

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