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KRE aluminum D-port heads are the most bang for your buck .If you are rebuilding a original d-port motor and you already have d-port headers. KRE aluminum d-ports are your best choice for your money. You just have to make sure your bottom end of your motor is strong enough to handle the entry power. You should at least have after market rods installed and a better than stock crankshaft is a good idea if you are going to run engine hard.
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kkre standard d-port 85cc chambers
Complete heads are assembled and ready to bolt on motor and include the following parts.
10 degree locks
steel 5/16 pushrod guide plates
Teflon PC seals
7/16 arp rocker studs
Comp 10 degree steel retainers
steel spring seats
1.437 hyd. valve springs
hardened spring shims if needed
stainless steel Ferrea valves 2.11,1.66
5 angle valve job
guides diamonded honed to exact tolerance
out of box ports flow 260 cfm @ 28 in. on kre's jkm 400 flow bench
ARP 190-3605 HEAD BOLTS FOR KRE D-PORTS OR EDELBROCK HEADS
$146.00
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ARP 190-4305 Head studs for KRE Alum. D-ports and Edelbrock
heads. 
AR
65 cc alum. D-port bare $1,245.00
74 cc alum. D-port bare $1,345.00
85 cc alum. D-port bare $1,395.00
65 cc alum. D-port complete $1,800.00
74 cc alum. D-port complete $1,900.00
85 cc alum. D-port complete $1,950.00
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C C completed ported heads
774cc Alum. ported to 290 cfm with 2.11 intake
$2,300.00
85cc Alum ported to 290 cfm with 2.11 intake
$2,350.00
74cc Alum. ported to 310 cfm with 2.11 intake
$2,300.00
85cc Alum ported to 310 cfm with 2.11 intake
$2,350.00
74cc Alum. ported to 325 cfm with 2.11 intake
$2,500.00
85cc Alum ported to 325 cfm with 2.11 intake
$2,550.00
74cc Alum ported to 340 cfm with 2.19 intake
$2,700.00
85cc Alum ported to 340 cfm with 2.19 intake
$2,750.00