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Old 11th January 2014, 04:26 PM  
doug_scott
 
Join Date: Jan 2014
Location: Ajax, ON CA
Posts: 1
Re: Gurney Weslake Head performance

Comparing current technology to technology from the 60's in regards to cylinder head design should not really show any large advancement, except in manufacturing. I think the big leap is in that part of development. Even the most advanced cylinder heads today are not doing anything that was not available since the 20's. The only advancement would be in the variable cam timing, but, that is not really head design. Big change in engine power now comes from electronics.

I recently read that Jon Kasse is developing a Windsor canted valve head that is giving good horsepower numbers. Head is called P-38. Flow numbers from his website look quite remarkable. The head supports stock intake and exhaust patterns. They do not require special manifolds.

"Equippedwith Kaase P-38 cylinder heads, a modest camshaft, and an Edelbrock Junior intake, the 302, running on pump fuel and barely 9:1 compression ratio, easily generates 500hp @ 7500rpm."

Numbers taken from his website:

P-38 Cylinder Head Specifications:
Chamber CNC machined: 60 cc
*Intake Runner Volume:*
240 cc
Exhaust Runner Volume:
86 cc
Intake Valve Diameter:
2.100
Exhaust Valve Diameter:
1.600
Intake Valve Length:
5.450
Exhaust Valve Length:
5.450
Intake Valve Angle:
8
Intake Valve Cant.:
4.5
Exhaust Valve Angle:
10
Exhaust Valve Cant.: 4
Valve Spring Diameter:
1.550
Valve Guide:
11/32
* Intake runner Volume CC can not be compared to other Windsor cylinder heads because of deeper valve bowl area. * Valve Spring Installed height up to 2.000

Flow Chart as Delivered @ 28'' Superflow SF-1020 Pro Bench

Intake
.200
156 cfm

.300
219 cfm

.400 265 cfm

.500
297 cfm

.600
308 cfm

.700
309 cfm

.750
311 cfm



Exhaust .200
111 cfm

.300
142 cfm

.400
169 cfm

.500
185 cfm

.600
199 cfm

.700
208 cfm

.750
215 cfm

Flow Chart with Conventional port work @ 28'' Superflow SF-1020 Pro Bench
(not a raised port)

Intake
.200
163 cfm

.300
232 cfm

.400 285 cfm

.500
328 cfm

.600
348 cfm

.700
350 cfm

.750
355 cfm



Exhaust
.200
110 cfm

.300
153 cfm

.400
194 cfm

.500
222 cfm

.600
233 cfm

.700
238 cfm

.750
241 cfm

Jon Kasse's website is Jon Kaase Racing Engines - Kaase P-38 Canted Valve Small Block Ford Heads
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