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07-31-2020, 09:38 PM | #1 |
Senior Member
Join Date: Jul 2015
Location: Phoenix, AZ
Posts: 1,333
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1974 454 rebuild questions
I've run a bunch of searches on this topic as there's been many a 454 rebuilt, and none seem to give me any specifics on what I'm looking to do. Basically, I'd like to get about 400 HP out of it while keeping it mostly stock, which I've read is pretty easy. Just seems like there's a ton of HP left on the table with these engines. Except I haven't seen how to actually accomplish this.
As far as I can tell, the engine is completely original to my 74 C20, so it's a stock 454. I don't really want to do a stroker and end up buying aftermarket heads, intake, etc. So what do I need to do for the following:
Sadly, as always cost is an issue, so I'd like to keep my costs within reason. I appreciate the help and sorry for another 454 rebuild post. |
07-31-2020, 09:52 PM | #2 |
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Join Date: Dec 2012
Location: Temple City
Posts: 3,573
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Re: 1974 454 rebuild questions
A comp 268 cam, and full bolt on make a 454 a 400+hp engine.
I would heavily consider a roller cam for use with today's oils, and using the new style blue gaskets. Which helps with oils leaks vs old style gaskets. You want 8.8-9-1 compression for use with today's gas. Unless your willing to run 92 all the time. I am not the best with big blocks, but closer to a zero deck you can run the better. It keeps the quench tighter. Unless you have open chamber heads, and then I would consider getting new ones. Even peanut port heads are capable of laying down serious HP numbers, and a mountain of torque. I mentioned a while ago a friend built a engine with them till he could afford the heads he thought he wanted. He mildly ported the heads himself, and in his 468. It had to be close to 475hp/500tq. It had power from 1000-5000 rpm, and could hit rpm before it really started to roll over hard. |
08-01-2020, 11:37 AM | #3 |
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Join Date: Mar 2003
Location: Colfax-California
Posts: 8,442
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Re: 1974 454 rebuild questions
It doesn't take much to wake up a 74 engine. If I am correct the factory compression was like 7.5 or 7.8 to 1. So bumping it to about 8.5-8.8 will help a lot. Cam as suggested comp 268 with a good valve job and you're done. Unless you are going to race this and spin it up to 5-6 grand all the time, just run the stock heads with a clean valve job. Both of my 454s rarely see over 4000 rpm. All the power is in the bottom end for what I use my trucks for
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08-02-2020, 10:10 AM | #4 | |
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Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
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Re: 1974 454 rebuild questions
Quote:
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American" |
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08-05-2020, 05:20 PM | #5 |
Senior Member
Join Date: Dec 2011
Location: Moraga, CA
Posts: 809
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Re: 1974 454 rebuild questions
What these guys said. Also, check out Richard Holdnener's YouTube channel for lots of great dyno tests and discussions.
EDIT: Here is an example: https://www.youtube.com/watch?v=h9H6gv2aiVk I could spend all day on his channel.
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(Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1 http://67-72chevytrucks.com/vboard/s...d.php?t=567340 |
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