454 mag mpi cam help NOT Tyler Crockett
10-23-2019, 08:47 AM
#42
Registered
iTrader: (1)
No, that's not the cam.
Originally Posted by sb
Mag BBC 454/502 Flat Tappet (rect heads)
.004” 296*, 296*
.006” 286*, 286*
.050” 224*, 224*
.200” 130*, 130*
Valve lift with 1.7 .510”, .510”
LSA 115.5
Merc Part#431-9830 / GM#14096209
ICL 114 ATDC
ECL 117 BTDC
=============================
For reference sakes, the carbureted 7.4L Merc 400 / 420 / 425 's
came with the following flat tappet cam:
Crane Part#132561 Grind # H-228/312-2S-14 T1.2
Duration at .004” : 298, 306
Duration at .050”: 228, 236
Lift with 1.7 rocker: .530”, .551”
LSA 114LSA
ICL 109 ATDC , ECL 119 BTDC
.004” 296*, 296*
.006” 286*, 286*
.050” 224*, 224*
.200” 130*, 130*
Valve lift with 1.7 .510”, .510”
LSA 115.5
Merc Part#431-9830 / GM#14096209
ICL 114 ATDC
ECL 117 BTDC
=============================
For reference sakes, the carbureted 7.4L Merc 400 / 420 / 425 's
came with the following flat tappet cam:
Crane Part#132561 Grind # H-228/312-2S-14 T1.2
Duration at .004” : 298, 306
Duration at .050”: 228, 236
Lift with 1.7 rocker: .530”, .551”
LSA 114LSA
ICL 109 ATDC , ECL 119 BTDC
10-23-2019, 10:15 AM
#43
Well Im going to attempt the cast crank. The engine is 385 hp to the prop but the engine is limited to 5100 RPM. As far as being easy on it Ill try to take it somewhat easy. I have to ask HOW WHAT and please tell the story and what boat was this in? Looks like cast internals but why was it not happy with your build? Did this crank break under high RPM because with that I would expect much more damage....to the point water is leaking into the boat.
10-23-2019, 10:57 AM
#44
Well Im going to attempt the cast crank. The engine is 385 hp to the prop but the engine is limited to 5100 RPM. As far as being easy on it Ill try to take it somewhat easy. I have to ask HOW WHAT and please tell the story and what boat was this in? Looks like cast internals but why was it not happy with your build? Did this crank break under high RPM because with that I would expect much more damage....to the point water is leaking into the boat.
04-23-2022, 05:01 AM
#45
Registered
Hello, I have built several MPI engines and have lots of parts left over from my build.
I have bored out throttle bodies 68 MM https://www.tpis.com/pages/11_7_12
Ported upper intake to match throttle bodies
Cut down intakes for higher RPM.
Extra wiring harness
MEFI computers
Cool fuels
distributors
etc
I have bored out throttle bodies 68 MM https://www.tpis.com/pages/11_7_12
Ported upper intake to match throttle bodies
Cut down intakes for higher RPM.
Extra wiring harness
MEFI computers
Cool fuels
distributors
etc
The following users liked this post:
articfriends (04-23-2022)
Platinum Member
04-28-2022, 12:53 PM
#47
Geronimo36
Gold Member
Pretty much sums it up and it reaches further than just OSO. It's everywhere... The answer these days is to get a center console with 12 400's or a lightweight cat with 450's that are reflashed and then ad a big stereo system and you have your sound...lmfao
04-28-2022, 12:55 PM
#48
Geronimo36
Gold Member
Ouch, who built that? Looks like all Scat parts?
