c20 vs. F100
Senior User
Joined: Nov 2012
Posts: 225
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From: N,Ga
With 11 to 1 compression ratio I say: no way on his claimed HP numbers.
Your BBF should spank him big time "if" you could ever get it to hook up (which I seriously doubt).
With that said, it takes a lot of work and $$$$ to reach 2 HP per cubic inch.
I've been building race engines for nearly 30 years an we consistently see 650 HP on 328 (destroked 350) Chevy engines running 13:1 with alcohol @ 7500 RPM used in Nascar Modifieds.
I get goose bumps every time we run one on the dyno with a sheet of plexiglass between you and the engine.
Your BBF should spank him big time "if" you could ever get it to hook up (which I seriously doubt).
With that said, it takes a lot of work and $$$$ to reach 2 HP per cubic inch.
I've been building race engines for nearly 30 years an we consistently see 650 HP on 328 (destroked 350) Chevy engines running 13:1 with alcohol @ 7500 RPM used in Nascar Modifieds.
I get goose bumps every time we run one on the dyno with a sheet of plexiglass between you and the engine.
And it's a know fact the GM boys always add 200HP to their engines to compensate for a small *****.
The only problem I see with your motor is the carb size. Bigger is not better by no means. The last motor I built before I left the shop was a BBC. It was somewhere around 750 cubic inches and made 720hp. We only had 750 cfm Barry Grant on it. The plugs were reading good during break in and during dyno time. So by that the CFM was right. As far as the 383, maybe 350-375HP depending on heads.
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Junior User
Joined: Jun 2013
Posts: 77
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Your main problem will be getting your truck to bite. When it does your next problem will be broken parts. Until you line them up nobody knows. The Chevrolet is geared low assuming stock gears. There are many online calculators to help with gear choice. Find 1 & work out the best gear for your situation. You will launch out of the hole given superior torque. This isn't that rough Chevrolet truck with the camper shell on it that does wheelies is it?
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Junior User
Joined: Jun 2013
Posts: 77
Likes: 0
What gas is he running? Race gas? Is he running a power adder on it? What gas are you running? Have you ever been over to 460ford.com or 429-460ford.com? They will give you a good idea of what you will make. In my opinion; anything that runs solely on race gas is not street-able. Your compression seems awfully high for pump gas and iron heads; not gonna run too well on pump gas. Now if u are running race gas; you will be ok. BTW, a holly 950hp would be a much better carb on the street.
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Junior User
Joined: Jun 2013
Posts: 77
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I know the feeling! I always think " did I troq all the rod bolts?"
And it's a know fact the GM boys always add 200HP to their engines to compensate for a small *****.
The only problem I see with your motor is the carb size. Bigger is not better by no means. The last motor I built before I left the shop was a BBC. It was somewhere around 750 cubic inches and made 720hp. We only had 750 cfm Barry Grant on it. The plugs were reading good during break in and during dyno time. So by that the CFM was right. As far as the 383, maybe 350-375HP depending on heads.
And it's a know fact the GM boys always add 200HP to their engines to compensate for a small *****.
The only problem I see with your motor is the carb size. Bigger is not better by no means. The last motor I built before I left the shop was a BBC. It was somewhere around 750 cubic inches and made 720hp. We only had 750 cfm Barry Grant on it. The plugs were reading good during break in and during dyno time. So by that the CFM was right. As far as the 383, maybe 350-375HP depending on heads.
Logistics Pro
Joined: Nov 2003
Posts: 4,371
Likes: 7
From: PA
I don't see that 383 putting out that kind of Hp my buddy built a blown 383 and was only in the 600hp range I don't see it happening with a na motor unless high compression race fuel or maybe alky or nos added from the sounds of your motor you should walk all over him any day but I'm thinking your main problem will be hooking up and putting that power to the ground unless you hook that power is worthless and he will eat you
Junior User
Joined: Oct 2012
Posts: 92
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From: Aviston, Il
Just think how good you are going to feel when you smoke that supposed 650 horse 7000 rpm small block with your 450-500 horse big block.
And I don't know about the availability in your area, but if you are worried about your compression, maybe you could consider running e85. It's a heck of a lot cheaper than race gas, good for about 12-12.5 compression, runs cooler and is good for a little more torque. Some people have a bad opinion of it, but we have had good luck with it in some of our roundy-round cars.
And I don't know about the availability in your area, but if you are worried about your compression, maybe you could consider running e85. It's a heck of a lot cheaper than race gas, good for about 12-12.5 compression, runs cooler and is good for a little more torque. Some people have a bad opinion of it, but we have had good luck with it in some of our roundy-round cars.
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Joined: Nov 2012
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From: N,Ga
Edelbrock's are great for driving. I love them better then anything for just driving. But, add a good Holley, BG or Demon and it'll feel like you added 50HP. I dyno'ed the 302 in my Ranger at 394HP with an Edelbrock 750. I later added a 650 Race Demon and it was like I added 100HP. But whatever you decide it'll be good.
Posting Guru
Joined: May 2010
Posts: 1,867
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From: Alton, MO
Damn you Bobby! I keep thinking I am getting closer & closer to your engine & you throw something new in the mix. 
I would love to line them up side by side & do a video. I would expect your truck to take mine at this time but I think it would make a great video.
I would love to line them up side by side & do a video. I would expect your truck to take mine at this time but I think it would make a great video.
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