Anyone know what stock HP is on an '86 454? Also, anyone running the Edelbrock or Holley MPI kits that they have for the 454 or even the 350 for that matter? Thanks.

I believe that it would be around 210 HP and 325lb/ft of torque for an 86.

You wanna look for the "LS6" type 454 they had the REAL HP:eek: :beer:

No, see I already have a '86 454 and want to know what it puts out. I am looking to put either the edelbrock or Holley MPI system on it and rebuilding it with a towing cam, port and polish the heads, headers and high flow exhaust. One of the other problems I'm running into is I don't know what diameter exhaust to go with. Also, If anyone has any imput on either of those MPI systems, I would love to hear it. Thanks.

Can't help with the injection, but in '86 that engine (like most other American powerplants in that era) was severely handicapped by low compression. When you go through it, your biggest gains will be realized directly from increasing the compression ratio; and since you mentioned polishing the heads you should have NO trouble running 9.5:1 on pump gas, sea level alt. and expect this to give ca. 75% power boost over what you've got now - compression and cam were the principal differences between the LS6 and the more mundane motors. Where I work (Los Alamos is 7200 ft.) people run 11:1 on 88 octane. Check http://www.speedomotive.com for stroker kits for that engine if you want to couple the compression increase with a few extra cubes, and longer crank throw for more low end. A mild stroker setup will easliy double your current output, and some of these can get pretty wild (just how fast can you afford to go?) For header diameter you first need to know how you plan to cam the engine and what rpm range you want. For most streetable/offroad type applications the smaller tubes will help keep exhaust gas velocity up and give better low end. If you're building for a +3000 rpm powerband go for the big-tube headers. For the rest of the exhaust system, the magic formula is 2.2 cfm per horsepower. It's not the diameter of the pipe that's restrictive, it's the mufflers themselves; one approach is to put big-tube mufflers in a smaller exhaust system. Holley is one of the only manufacturers to publish cfm numbers (for their new Aero-Chamber mufflers) and they compare them to Flowmaster and others. You should be able to find an exhaust shop with a flow bench that can give you more information.

Lloyd,
Thanks for all of your help. However, I should have stated this earlier. I'm not looking for a racy, high r's engine. I have an '86 Chevy 4x4 Dually that will most likely need a rebuild before to long. What i'm looking for is not a whole lot of power, the 454 is a lot for what I have already, what i'm really looking for is some ways to get some Mileage out of the engine. I have a Comp Xtreme energy cam in mind, with fresh rebuild, port and polish heads, high flow exhaust (consisting of 2.5 or 3" pipes, Jet-Hot coated headers, high flow dynomax cats, and Dynomax Ultra Flo SS mufflers, Dual all the way back), Jacobs Ultra Team Ignition, and one of the Injection systems mentioned above, and I'm thinking about throwing in a 4L80E tranny to give me the OD. I really need some advice on the Injection systems if anyone can help.