Cosworth head
Lift L/D Intake
.100 .71 80.00
.200 .141 150.00
.300 .212 203.00
.400 .282 245.00
.500 .353 250.00

ISP Street CNC head
Lift L/D Intake
.100 .71 106.00
.200 .141 171.00
.300 .212 231.00
.400 .282 261.00
.500 .353 287.00

ISP Race CNC head
Lift L/D Intake
.100 .71 108.00
.200 .141 190.00
.300 .212 255.00
.400 .282 282.00
.500 .353 295.00

 

Inches of water or mercury and how much of either?

 

28 inches of water

 

How much with no cams just the hardware?

 

are these CNC machined? or hand ported?

are the runners still relatively small? or is this a hogged-out drag race only application?

 

Jasil
dont have final prices yet.
Jbrown
Yes these are cnc machined heads. Runners are still relatively small. we wanted his head to make as much velocity as possible. that way you dont loose midrage power. believe or not midrange power is very important on big turbo cars such as the ones that we are working on.
Peter

 

Core needed?
Seats?
Which valves available?
Valvetrain/spring/retainers options?

Very interested in details.

 

Is that because thats where all your spool up characteristics are determined?

 

These are the numbers that I have

Intake flow at 28.0"

Lift_________Stock________Cosworth
.050________47.5__________47.4
.100________87.5__________93.6
.150________130.9________139.0
.200________168.7________178.9
.250________199.2________211.2
.300________219.3________238.8
.350________230.1________258.3
.400________220.9________268.9
.450________224.2________274.6
.500________226.5________277.6

 

How soon before "before and after" dyno numbers? I know you listed a "street" head but ideally what's the minimum turbo size needed to realize substantial benefits/ flow enough air to this head?

 

we can reuse your core or new one its up to you. we use supertech valves, springs, and retainers.
thanks for your interest

 

Most of the spool up characteristics are determined by the turbo you use. having well designed head can help you with the spool up. I'll post dyno graphs tomorrow comparing different heads
Peter

 

Amazing work - I am looking forward to seeing your car back in action this year

is Job from Turbo People still tuning it ?

 

did you test the cosworth head yourself, or did you get the stats somewhere

 

DynoFlash
thanks we are finally ready for next year season!
we have in house tuner now but Job still helps me along the way.


socalmr
cosworth and our heads were tested on the same flow bench.

Peter