Description
Full port good for 7600-8500 rpm peak power.
500-800 rpm better spool
***Has exhaust micro polish which reduces heat transfer keeping engine cooler and further turbo response***
Typically, 5-11 psi boost reduction for the same power in the same set up. (Larger differences are possible)
Ratings below on a scale of 1-10 how good this cylinder FK8td ported head will perform for the application compared to stock.
******This does NOT apply to other companies cylinder head port work*******
drop in turbo power gains stock=5-6 Full ported =6.5-9 (not recommended for mhi stage 2 or normal kuro)
Full Frame power gains stock=5-6 Full ported=7-10
Street manners stock= 9 Full ported= 8
Drag strip use stock=3 Full ported =9
Circuit racing or autocross stock =5 Full ported =8-9
Roll racing stock=1-5 Full port =7-9 (rating relevant to turbo size)
Turbo spool and lag response on a drop in turbo stock=3-5 Full ported =9-10
Turbo spool and lag response on a full frame turbo stock=2-5 Full ported =9-10 (g25-660.72 ar works ok stock head, larger ar and larger turbos do not)
Boost reduction using stock camshafts stock=0 Full ported=6-10 psi reduction for the same hp
Boost reduction for the same power using camshafts stock=2-6 psi Full ported =10-18 psi reduction for the same hp.
Cold start manners (overnight on hondata) stock= 10 Full port=7-8
Cold start manners (overnight on Motec) stock= 10 Full port=8-9
Cold engine drivability stock=10 Full port=9
Fuel efficiency stock=10 Full port=7-8 (loses 4-6mpg when tuned properly)
Knock sensitivity reduced near timing limit stock=4 Full port= 9 (less sensitive to timing making tuning safer and easier near the limit)
Peak power capability (gains grow w turbo size) stock=3-5 Full port= 9
Minimum size turbo recommended stock=stock turbo Full ported= G25-660/equivalent or larger turbo suggested.
Typical gains per the turbo are (G25-660 60 whp, G30-770 up t0 70-90whp, G35-1050 85-100whp)
Testing with a G30-825 using stock head does not exceed 400 wheel torque until 5200-5500 rpm compared to ported head will exceed 400 wheel torque by 4200-4600 rpm using an Fk8td Ported head
Gains are mostly exponential with turbo size using ported heads
Peak power capability estimated at 1000whp. Exhaust outlet enlarged to match v-band flange volume. This is critical for big power. It’s possible to make more depending on turbo, fuel and compression. The estimation is using a heavy roller Dynojet and not a hub dyno.
Pockets are ported blended into divider
Guides were removed to ensure clean transitions and bowl shape
Intake port divider is knife edged
Heavy casting flash is sanded down through full intake port
Exhaust outlet enlarged
Full micro polish through ENTIRE internal exhaust area and pockets of the cylinder head
Bronze guides installed
Custom valve job on Serdi
fully cleaned and ready for assembly
Does NOT include any valve train
NO CORE CHARGE OR EXCHANGE
not returnable
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