Hey guys. Long time member, rare poster. I'm the guy with the 460 Crown Vic. We got this dyno on Friday and I'd like opinions! I have a couple of questions, after the picture.
First, my combo:
1983 460 Short Block bored .40 over
1983 OE spec pistons & rods
1968 C8 Ford Heads, home ported as per Scott J.'s website
factory '68 valve train w/locking nuts
Custom cam per Scott's design - .492 Intake lift, .523 exhaust lift, 217.7 intake duration, 230.1 exhaust duration
Adjustable roller timing chain set to o*
Stock 83 Ford truck water pump
Stock 83 Ford truck (4x4) oil pan
Edelbrock Performer Aluminum Intake
Holley Street Avenger 770 w/ 72/72 jets
Dura Spark distributor w/Scott's advance curve 14* initial timing.
Mallory Hy-Fire VI-AL ignition box
Mid length tubular headers headers from Fordpowertrain.com (Shorty II's)
True dual exhaust with straight pipes, custom H. 2.5" Dynomax Super Turbo mufflers, to side exit exhaust.
Mallory 4110, 110 GPH electric fuel pump, dead headed and self regulating at 7 psi.
31x19 Aluminum Radiator
1995 Taurus electric cooling fan and shroud
PSM variable fan controller
'78 Lincoln C6 Transmission with "F" apply servo
'78 Lincoln factory stall converter
Dyno image here:
My dyno simulations all show this combo should make peak horsepower at 6000 RPM. Any idea why it would be peaking at 4500?
Any other suggestions, questions or recommendations?