High Performance Volkswagen Modifications

16 Valve Volkswagen Heads are HERE!

Street Driven 56’ oval window, 16v Superpower. Sleeper-------- yeah right.

Street race VW owned by Tom Luna. ARAO 16v 2332cc motor, twin turbo, Air to Air intercooled, 4 throttle bodies.

360 HP at 15 lbs boost. Over 500 HP available at full boost. Shows Twin Airesearch Turbos, Arao Eng. Air to Air tube intercoolers, 4 Mikunis, and plenum intake manifold.

Shows heads installed in vehicle. Spark plugs go through valve covers. Use “HEMI” spark plug wires. Valve covers use no gaskets, but a face “O” ring and spark plug tube “O” rings. Covers secured to heads with four bolts. Note standard exhaust headers and pushrod

Shows intake and exhaust ports. Standard intake manifolds bolt on or in this case a special 4 bolt pattern intake has been installed. This is a drag head with minimal fins for alcohol use. Street heads have full fins.

Exhaust port flow at 28”
Lift	CFM
.100”	79
.200	125
.300	176
.400	204
.500	217
.600	225

Intake port flow at 28”
Lift	CFM
.100”	105
.200	189
.300	232
.400	263
.500	271
.600	265

Valve cover with valve train. Uses “O” rings for spark plug tubes and an endless “O” ring on face.

4150 Chromoly rocker arms are light and strong for high speed operation. Valve train uses all standard high performance camshafts for 1.1:1 ratio rockers. 4v heads do not require high lift and ratio rockers. Lower rockers open lower valves, push on upper rockers which operate upper rockers.

16v combustion chamber side. Dual 35.5 intake valves equal the curtain flow area of a single 70mm intake valve. (curtain flow area is defined as area of perimeter of valve multiplied by the height of the lift multiplied by 2 valves). The dual 32mm exhuast valves have a curtain flow area equal to a single 64mm exhaust valve. This huge valve area combined with a good port, is the reason for the huge gains in horsepower and torque.

Heads fit 94mm bores or larger, with standard bolt pattern. Standard flat top pistons can be used.

Valve spring side, shows dual springs and chromoly retainers, just twice as many. Standard pushrod tubes, pushrods and camshafts can be used. Standard big tube headers bolt on, and standard intake manifolds bolt on. Standard sheet metal fits with trimming.

Heads come with everything needed to convert to 16valves. Pair valve covers, rockers, and heads completely assembled.

Introductory price $4400.00 per pair

Arao Engineering Inc. has been in the high performance Volkswagen industry for over 20 years. Starting with the manufacture of the infamous VW Hemi heads of the 70’s (pictured above), high performance street, sand and drag racing engines of the 80’s and 90’s, to the type IV killers of today. Continuing today, offering The most state of the art, full high performance machining services and racing engine building. With existing and new products being constantly researched and developed. If not local, your machined heads and cases can be shipped anywhere in the country, via UPS or Fed Ex. I am proud to be involved, and continually innovating the lasting, strong industry of Volkswagen high performance.

Thank you,
Russ Arao