The Next Generation head was designed
to be more efficient than the existing wedge configuration.
The intake runner is located 180 degrees from the exhaust
runner which provides a better path for incoming and exiting
air. The combustion chamber is designed to unshroud both
intake and exhaust valves while locating the spark plug
in a more ideal position to enhance flame propagation.
Rocker arms are positioned to give excellent valve train
geometry. The exhaust rocker is over 75% longer than a wedge
chambered head enhancing better spring life and smoother
acceleration for modern high lift cams. Most hemispherical
cylinder heads have ten ½ or 9/16 stud fasteners.
Sonny's has incorporated twenty-two ½" studs
necked down to 7/16. This allows better load distribution
and more stud stretch for better clamping force. Supercharged
applications can use straight half inch studs. We used four
extra studs in the bottom row to eliminate the stud from
intersecting exhaust ports.
Combustion chambers can have a range from 65 cc's to 95
cc without welding. Intake and exhaust runners are cast
ported and have guide spacing to accommodate a range of
2.450 to 2.700 intake intake valves and 1.880 to 2.000 exhaust
valves. With the chambers ported correctly, the intake will
flow 570 cfm @ .900 lift with a 2.550 valve and exhaust
will flow 390 cfm @ .900 lift with a 1.960 valve.
We have found that this type head will make more horsepower with
20 cfm less air flow on the intake side, on a 800 cu. in. Pro Stock
engine. This is because of better quality air on the intake side and
a more efficient chamber.
Sonny's also offers rocker arms, valve covers, valve cover
gaskets, aluminum blocks, crankshaft, 60 MM camshafts and
sheetmetal manifold. This head is available to the general
public in raw form or machined in different stages.
This type head was used Mid season on John Montecalvo's
Citgo sponsored Pro Stock engine with top M.P.H. and
#1 qualifier two times. Vinnie DeCeglie won the 2003
World
Finals in Pomona, CA in Comp. Eliminator using this
“Next Generation” hemispherical head.
First GM Pro Stock to run 6.40's (6.49 @ 214.30)
2005 Vinnie DeCeglie is currently the A/A record holder in Competition Eliminator with a 6.52 E.T.
First Race in 2006 at Pomona,CA Vinnie DeCeglie was #2 qualifier with a
6.53 @ 212 MPH in Competition Eliminator
Call for prices and availability!!!
