280's With 800+hp
#21
VIP Member
VIP Member
Pat,
I think you're mixing crankshaft and prop shaft HP ratings. The HP500EFI/HP500 is 470 HP at the prop (not 500 HP) so you're looking at +55 HP which is more like +4 MPH gain - not 7 MPH to 8 MPH. The 500EFI set up will cost you a lot more then HP500 as you'll need belt drive fuel pump/water pump set up(to feed the EFI pump) and CMI headers ($$) to match the ECU mapping.
I think you're mixing crankshaft and prop shaft HP ratings. The HP500EFI/HP500 is 470 HP at the prop (not 500 HP) so you're looking at +55 HP which is more like +4 MPH gain - not 7 MPH to 8 MPH. The 500EFI set up will cost you a lot more then HP500 as you'll need belt drive fuel pump/water pump set up(to feed the EFI pump) and CMI headers ($$) to match the ECU mapping.
So do you think an extra 85-90HP gets me running over 75mph?
It would be nice to here from someone that has a 280 with a 500HP.
I have Stainless Marine manifolds which should flow plenty for a 500HP; they flow not much less than the small CMIs. As for the EFI system, I have an AZ Speed intake, the TB, and fuel injectors from a 500EFI. I also have the Crane/Merc 500EFI roller cam, roller lifters, and roller rockers. The heads I have are from a HP500 carb engine so I'll need to change the valve springs. The wiring harness and MEFI III ECM I also have in stock, but the ECU will need to be remapped. I have a water cooled double electric fuel pump setup that should flow plenty and I have an adjustable fuel regulater. I even have a K&N spark arester/filter for the the system.
What I need is the parts to build a good quality stroker short block out of my Gen VI 454.
__________________
Patrick
Patrick
#23
VIP Member
VIP Member
Now I just hope I'll have the $$ after doing our taxes...
__________________
Patrick
Patrick
#25
VIP Member
VIP Member
I plan to do Block at least twice this summer; once with the wife and kids and once with the big boyz.
Same with Claudio's, that a great day trip for us.
As for the engine, the next step will be to find a stroker kit for my gen VI 454; most seem to be for gen IV engines.
later all,
__________________
Patrick
Patrick