We receive these 6-bolt, cathedral port heads as porter castings from Brodix and put them through our machining processes imparting our own designs at each stage. Brodix has incorporated a 13.5 degree valve angle with the Brodix steel intake and Inconel exhaust valves sized at 2.100 and 1.600 inches respectively. The Made in USA castings are produced from virgin A-356 aluminum alloy and have a thick deck to handle nitrous and blown applications. They also make great power naturally aspirated as you can see in this ad's video.
While some head porters chase maximum flow numbers, we are more interested in finding optimum power without compromising the head's strength and durability. For example, we leave more metal around the valve guide to ensure longevity. The machining steps we do include more than just the 5-axis CNC work. Our Newen CNC seat & guide machine does a precision valve job and bowl blending in a single step.with incredible precision. Our Berco mill ensures a perfectly flat deck with hand touch up steps of chamfering and deburring.
The finished head has port volumes of 290cc on the intake and 109cc on the exhaust. By our measurements, intake flow is 335cfm at 0.600 inch lift with exhaust at 224cfm. We have a single technician perform all our flow testing to reduce test variability Air flow results will vary based on operator, flow bench and other variables. We therefore advise against using anyone's reported numbers as a precise means of comparison. Our results are used primarily for internal comparisons with the true performance arbiter being our engine dyno.
The Borowski-Manley dual LS valve spring kit includes:
- dual Manley NexTek valve springs with 1.340 in. outside diameter, 394 lbs./in. rate, and 1.050 inch Coil Bind Height,
- Manley titanium valve spring retainers - Dual, Tall Style, 7 Degree, Titanium, 1.200 in. Retainer O.D,
- Manley valve spring locators - ID: .567", OD: 1.320", Thickness: .035", Shoulder Diameter: .715",
- Manley machined bead valve locks with valve stem seals.
Click BUY NOW to get over to our website for more info or to place your order. Please call us at 815-725-2727 If this spring kit is not exactly what you need. We will look to get you a different set that better suits your needs. We would also be happy to answer any questions.
BUILT BY PEOPLE WHO LOVE MOTORSPORTS FOR PEOPLE WHO LOVE MOTORSPORTS
