Blown 454 HO Crate Motor

[widowmaker]

Looking to add a blower to my motor. It is a 2002 GM 454 HO crate motor presently turning a B impeller 5600 rpms. I'm going to change up and run a AA impeller and would like to see around 600 h.p. . In stock form the motor is rated at 425 H.P. @ 5250
The motor has approximately 50 hours on it and has an MSD ignition.
I would like to consider using an intercooler for the ease of pump gas.
How much boost can this motor take on pump gas? Intercooled? Non Intercooled?
Is it safe to run a blower after 50 hours or should I do rings and bearings?
Any suggestions to get to a solid 600 h.p.?
Which blower? 6-71 or 8-71?
Whipple charger? Pro Charger? BDS?
Any feed back would be greatly apprieciated. Thank you.

[DEL51]

If it were mine I would check the parts list and make sure you have forged pistons, then find out your static compression ratio. If forged and comp ratio is les than 9 to 1 things are looking up. Next, see what the head gaskets can handle,I do not know who to ask on this.Boost on pump gas has some variables. I would like to tell you more, but without knowing more about the engine, etc. Ken duttweiller and Hot rod magazine built a H.O. 454 that made about 800hp with a roots blower and 2 850 carbs.

[widowmaker]

quick stats on the motor
4 bolt main
8.75 compression ratio
forged pistons
roller cam
Forged steel crank
7/16 forged steel rods
Iron rectangular port; 118 cc chambers,
So I'm thinking I've got a great base to build on.

[jbone]

I'm curious, What kind of boat do you have and what speeds do you see at 5600 rpm with the b imp??
J

[Liberator TJ1984]

quick stats on the motor
4 bolt main
8.75 compression ratio
forged pistons
roller cam
Forged steel crank
7/16 forged steel rods
Iron rectangular port; 118 cc chambers,
So I'm thinking I've got a great base to build on.
Yep as long as you don't get crazy on the Boost :p
I'm Running the same set up only with 3/8" rod bolts (arp )
@ 16# I pushed the stock head gaskets :crossx:

[widowmaker]

The boat is a 19' eliminator Sprint. Light layup. GPS'd at 84.6 downriver, so That's probably right around 80 on flat water. It currently has a wieand tunnel ram with dual 450's. The pump is decked out with goodies, shoe and ride plate, loader grate, stuffer plate, droop snoot, place diverter (red nozzle).
16 lbs, WOW, what is your static compression?? Intercooled?? Aluminum heads??

[Liberator TJ1984]

Was just screwing around with different pulleys to see what boost I would get :rolleyes: was aiming for 10-12# but got more than I wanted and pushed the gaskets , probably was just stacking air ? too....on GM 118 heads
as of now,
I am running the TRW pistons, I think the # is 2399 std.bore @.095dome floating pin with ProTopline Alum.320 heads = 8:75/1 comp. with a .60 thick Cometic head gaskets
sounds like the only difference in our motors is I have the smaller 3/8" rod bolts and bottom end is Studded
it's your motor :p but you should be able to run around 5-6# on good gas and maybe 10# on race fuel or av-gas ?? If you have the blower why not??
even with low boost levels the blower will add more low end grunt and Right Now power response

[Daytona100]

Hot rod mag did a big test on a HO-454 tried several different heads cams etc. Anyways the last test they ran a 8-71 with nitrous and got about a 1000 HP. Nitrous was overkill but it stayed together. Keep your boost under control in accordance with your comp ratio and you shouldnt have any problems.

[TIMINATOR]

Take the motor apart and clearance it properly for the blower. Blowers make HP, HP makes heat,heat needs more clearance. Also your cam in never going to make good power with a blower. ***boat had a "car engine in a boat?" article a few months ago, read it. TIMINATOR

[LynnsJet]

I agree with Daytona100. I have a similar Gen VI motor with a B&M 420 and I keep the pressure to 6 or 7 psi.
As for the cam I took out the 425 HO roller cam and put my hydraulic flat tappit Doug Herbert blower cam (out of my previous motor) in it. Blower cams are not wild like a NA cam and dont have the overlap that hurts a blower motor.
P.S. I now run dry exhaust because I never want to drop another valve like I did last Summer when I got some water into my motor through the exhaust.
That HO motor is a good motor to start your build from
Good Luck,

[DMOORE]

Looking to add a blower to my motor. It is a 2002 GM 454 HO crate motor presently turning a B impeller 5600 rpms. I'm going to change up and run a AA impeller and would like to see around 600 h.p. . In stock form the motor is rated at 425 H.P. @ 5250
The motor has approximately 50 hours on it and has an MSD ignition.
I would like to consider using an intercooler for the ease of pump gas.
How much boost can this motor take on pump gas? Intercooled? Non Intercooled?
Is it safe to run a blower after 50 hours or should I do rings and bearings?
Any suggestions to get to a solid 600 h.p.?
Which blower? 6-71 or 8-71?
Whipple charger? Pro Charger? BDS?
Any feed back would be greatly apprieciated. Thank you.
Since your looking at making a good running lake boat and not a race boat, no need to overkill. The 454ho is a solid motor to start with. A 6-71 will work fine for what your trying to do. Also since you have a never ending supply of cold water ,take advantage, and run an intercooler. It will alllow you to run an extra couple of psi. With that set up you might get away with 7-8psi on 91 octane. I would think that should put you right around 600HP.
Darrell.

[widowmaker]

I agree with Daytona100. I have a similar Gen VI motor with a B&M 420 and I keep the pressure to 6 or 7 psi.
Good Luck,
Are you running an intercooler??? Pump Gas???

[rpm2]

Here's something I found on ebay this morning.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=006&sspagename=STRK%3AMESE%3AIT&viewitem=&item=160067374413&rd=1,1