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Dub Oldham 08-01-2003 05:19 PM

GM 454 Crate Motor
I just purchased a new GM 454 (425 HP) crate motor and is there any thing that I can add to this motor to give me any more horsepower?

5-7heaven 08-01-2003 08:32 PM

:cool: howziit guy!

JMO, the possibilities are mindboggling. as we speak, CHEVY PERFORMANCE and CAR CRAFT are flogging their own 454HO engines. CP'S FRANKENRAT produced 800+HP, CAR CRAFT'S supercharged Rat made 926 streetable HP!:eek: :eek:

gt2betubbed 08-01-2003 10:21 PM

Give the specs of the 454 now, detailed ones.
Compression, heads, cam, intake, carb, ignition. Then we'll see what can be done.:)

Robinson Robin 11-12-2003 06:37 PM

ya I have heard the 454 HO crate engine has enormous potential (as long as you don't mind losing the warranty)

Super Streeter 11-12-2003 09:31 PM

You can find some power with this combo for not much cash.I would tear it down to a shortblock and send the heads out for a competition valve job and bowl blend and have the springs checked.Swap out the factory cam for a 502/502 cam,or similar grind,and add a performer rpm airgap intake and 850 cfm double pumper.With 1 7/8" headers this is a solid 500 hp combo or even a tad more.All the above will cost you under $1000 and give you 502/502 performance for a few bucks less.Good luck.

firestone 11-13-2003 07:42 PM

The first thing that you can do to that motor is put a bigger cam in it. They come undercammed and that should make a sizeable difference. I would look at someting like the comp cams XR288HR 236 242 dur @.050, .521 .540 lift powerband 2500-6000. your motor already has a roller cam in it, so the lifters can be used on whatever cam you decide to buy as long as its a roller. Air gap is also a realy good idea. I would also try 1.7 rockers.


Sandflea427SS 11-13-2003 07:54 PM

I believe the big Chevy comes stock with 1.7 rockers

firestone 11-14-2003 08:56 AM

I think you are right about the 1.7's, my mistake.


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