CHI’s Ford pro Series cylinder heads represent the ultimate in small block Cleveland cylinder head performance! With an intake port a full ½” higher than existing 3V head,s only Ford Yates D3 or Sc1 heads can compare on performance. With various port and chamber volumes available there’s a CHI Pro Series Head to meet your needs.
The latest addition to our range of Cleveland cylinder heads represents a significant increase in power potential. The knowledge gained from this testing and developing our range of 3V heads has been fully exploited resulting in the 3V Pro Series high port range of cylinder heads. This brings to you the customer the very latest in Ford race head technology, making it the most advanced Cleveland cylinder head on the market today.
The Pro Series Cleveland head comes in 2 fully CNC ported versions. At this level of performance CNC porting gives you the repeatable results needed to make the high horsepower level these heads are capable of achieving. The 245cc Pro Series has a 2.650″ minimum cross sectional area on the intake port and the 268cc version has 3.0” minimum cross sectional area. The 2.650″ is designed to work with our 3V 3.5″ 4500 manifold and is suited to 408+CI engines aiming for horsepower levels between the mid 700s to the low 800s. For horsepower levels beyond this, the 3.00″ port is designed to work with existing SC1 and D3 Ford intake manifolds.
The 3.00″ C-400 flows 400cfm by just .750″ valve lift with almost 350cfm at .500″ lift.
To achieve these exceptional results, the 3V Pro Series comes with our tried and tested Kaase 45cc combustion chamber as well as intake and exhaust port layouts. Both the inlet and exhaust ports have been raised. The exhaust port is just a further .100″ higher than our 3V exhaust whilst the intake is .500″ higher. The chamber is a very shallow and extremely efficient design with a total volume of just 45ccs. Valve angles remain standard Cleveland but the valve positions have been moved to optimize their location. These changes require a custom piston with at least a 1.200″ compression height. Most piston manufacturers have digitized the new chamber profile and we have custom pistons readily available. The relocated valve positions also require longer intake and exhaust valves. Using our custom valves will net valve spring installed heights in the 2.100″ range, dependant on the choice of collets and retainers.
Although this cylinder head is designed with shaft mounted rockers is mind, standard Cleveland roller rockers will work with this cylinder head and stud girdles will need slight modification on the intake side for them to fit.
Valve sizes are 2.190″ on the intake and 1.650″ on the exhaust. Our standard valve guide size for the Pro Series is .3125″ (5/16), but the heads can be ordered with 7MM and or 11/32 valve guides if necessary.
So when you’re looking for the ultimate SBF or Cleveland cylinder head look no further than CHI 3V for proven results and outstanding performance.
|Head Model||Part No.||Assembled||Chamber||Valve Sizes|
|Exhaust Pattern||Intake Manifold||Application|
|3V Pro Series||SBF3VRICAST-45||Bare||45cc||2.190/1.650||2V or 4V||CHI 3V|
|SBF3VRICAST-60||Bare||60cc||2.190/1.650||2V or 4V||CHI 3V|
|SBF3VRICAST-45-1||Bare||45cc||2.190/1.650||2V or 4V||CHI 3V|
|SBF3VRICAST-60-1||Bare||60cc||2.190/1.650||2V or 4V||CHI 3V|
|SBF3VRI268B-45||Bare||45cc||2.190/1.650||2V or 4V||CHI 3V|
|SBF3VRI268B-60||Bare||60cc||2.190/1.650||2V or 4V||CHI 3V|
|SBF3VRI268B-45-1||Bare||45cc||2.190/1.650||2V or 4V||CHI 3V|
|SBF3VRI268B-60-1||Bare||60cc||2.190/1.650||2V or 4V||CHI 3V|
|SBF3VRI268C5-45||Competition||45cc||2.190/1.650||2V or 4V||CHI 3V||Competition Solid Roller|
|SBF3VRI268C5-60||Competition||60cc||2.190/1.650||2V or 4V||CHI 3V||Competition Solid Roller|
|SBF3VRI268C6-45-1||Competition||45cc||2.190/1.650||2V or 4V||CHI 3V||Competition Solid Roller|
|SBF3VRI268C6-60-1||Competition||60cc||2.190/1.650||2V or 4V||CHI 3V||Competition Solid Roller|