Hello All,
I have a Shelby Aluminum 484 with Keith Craft CNC stage II edelbrock 6008 heads and edelbrock victor efi 4500 intake. I was wondering if anyone has suggestions on primary header tube diameter and length as well as the collector diameter and length.
This is a Hydraulic roller motor with FAST XFI 2.0 with ITC. This is going in 67 Fairlane 500 with C4 auto and gear vendors coupled to a 9' 3.70:1 35sp Detroit locker rearend.
When on Dyno with the Wilson 4150 throttle body and large dyno headers, the engine made 553HP @ 5600 and 555TQ @ 4900. I expected the HP to be over 600 for this build. I am hoping with the upgraded intake and throttle body as well as good flowing headers, I can get to 620HP or so. Duration on cam @0.050 was 242/248.
Exhaust valve size is 1.75".. Please let me know if you have any suggestions or need any more info. This is a 4.255 bore, 4.25" stroke motor at ~10.6:1 compression.
Thanks, Josh