Heads Iron Vs alunimum
01-18-2017, 07:02 PM
#32
Registered
I think we messaged about my build.
454 bored .060 over
L2399 pistons- 8.75 compression
Crane 134561 Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 3,000-6,000
Intake Duration at 050 inch Lift: 236
Exhaust Duration at 050 inch Lift: 246
Duration at 050 inch Lift: 236 int./246 exh.
Advertised Intake Duration: 296
Advertised Exhaust Duration: 306
Advertised Duration: 296 int./306 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.553 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.571 in.
Merc HP500 heads. 2.25 intake 1.88 exhaust
525sc/177blower
dominator carb
Made 572@5600 on the dyno. That was with the engine on the cool side. After the blower got warm, the pulls flattened out to 550-552hp on the later pulls. I have 60 hours on the setup. Runs great all the time, runs even better on cool days. I suspect a chiller is needed on a 177.
454 bored .060 over
L2399 pistons- 8.75 compression
Crane 134561 Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 3,000-6,000
Intake Duration at 050 inch Lift: 236
Exhaust Duration at 050 inch Lift: 246
Duration at 050 inch Lift: 236 int./246 exh.
Advertised Intake Duration: 296
Advertised Exhaust Duration: 306
Advertised Duration: 296 int./306 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.553 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.571 in.
Merc HP500 heads. 2.25 intake 1.88 exhaust
525sc/177blower
dominator carb
Made 572@5600 on the dyno. That was with the engine on the cool side. After the blower got warm, the pulls flattened out to 550-552hp on the later pulls. I have 60 hours on the setup. Runs great all the time, runs even better on cool days. I suspect a chiller is needed on a 177.
01-18-2017, 07:28 PM
#33
Registered
iTrader: (7)
I think we messaged about my build.
454 bored .060 over
L2399 pistons- 8.75 compression
Crane 134561 Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 3,000-6,000
Intake Duration at 050 inch Lift: 236
Exhaust Duration at 050 inch Lift: 246
Duration at 050 inch Lift: 236 int./246 exh.
Advertised Intake Duration: 296
Advertised Exhaust Duration: 306
Advertised Duration: 296 int./306 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.553 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.571 in.
Merc HP500 heads. 2.25 intake 1.88 exhaust
525sc/177blower
dominator carb
Made 572@5600 on the dyno. That was with the engine on the cool side. After the blower got warm, the pulls flattened out to 550-552hp on the later pulls. I have 60 hours on the setup. Runs great all the time, runs even better on cool days. I suspect a chiller is needed on a 177.
454 bored .060 over
L2399 pistons- 8.75 compression
Crane 134561 Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 3,000-6,000
Intake Duration at 050 inch Lift: 236
Exhaust Duration at 050 inch Lift: 246
Duration at 050 inch Lift: 236 int./246 exh.
Advertised Intake Duration: 296
Advertised Exhaust Duration: 306
Advertised Duration: 296 int./306 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.553 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.571 in.
Merc HP500 heads. 2.25 intake 1.88 exhaust
525sc/177blower
dominator carb
Made 572@5600 on the dyno. That was with the engine on the cool side. After the blower got warm, the pulls flattened out to 550-552hp on the later pulls. I have 60 hours on the setup. Runs great all the time, runs even better on cool days. I suspect a chiller is needed on a 177.
Those cams sound good on 454/468. Get as much air in and out of there as possible. You have scoops or enough clearance without. Install extra vents if need be. Intercooler pros and cons.
01-18-2017, 07:57 PM
#34
I think we messaged about my build.
454 bored .060 over
L2399 pistons- 8.75 compression
Crane 134561 Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 3,000-6,000
Intake Duration at 050 inch Lift: 236
Exhaust Duration at 050 inch Lift: 246
Duration at 050 inch Lift: 236 int./246 exh.
Advertised Intake Duration: 296
Advertised Exhaust Duration: 306
Advertised Duration: 296 int./306 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.553 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.571 in.
Merc HP500 heads. 2.25 intake 1.88 exhaust
525sc/177blower
dominator carb
Made 572@5600 on the dyno. That was with the engine on the cool side. After the blower got warm, the pulls flattened out to 550-552hp on the later pulls. I have 60 hours on the setup. Runs great all the time, runs even better on cool days. I suspect a chiller is needed on a 177.
454 bored .060 over
L2399 pistons- 8.75 compression
Crane 134561 Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 3,000-6,000
Intake Duration at 050 inch Lift: 236
Exhaust Duration at 050 inch Lift: 246
Duration at 050 inch Lift: 236 int./246 exh.
Advertised Intake Duration: 296
Advertised Exhaust Duration: 306
Advertised Duration: 296 int./306 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.553 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.571 in.
Merc HP500 heads. 2.25 intake 1.88 exhaust
525sc/177blower
dominator carb
Made 572@5600 on the dyno. That was with the engine on the cool side. After the blower got warm, the pulls flattened out to 550-552hp on the later pulls. I have 60 hours on the setup. Runs great all the time, runs even better on cool days. I suspect a chiller is needed on a 177.
Howsmit running with that static compression? what kind of fuel?
01-18-2017, 08:11 PM
#35
Registered
01-19-2017, 05:47 PM
#40
Registered
My 242 is an 86. It has about 2.5 inches of clearence. If your boat is an 87 or newer, the hatch is a few inches taller than the 86 and older boats.
