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Discussion Starter #1
Hey y’all, new guy here. My dad, brother and I just finished building our first Big Block Chevy that we will be putting in a '57 Bel Air. Here’s a list of parts we used:

454 4-bolt main block with main studs
AFR 290cc heads
Comp custom hyd. roller (237/241 @.050; .671” / .676” lift / 106 LSA)
L2465-F Pistons, deck clearance between .002 and .005; 10.5:1 compression ratio
Forged crank and connecting rods (ARP rod bolts)
Holley 950 Ultra XP carb
Edelbrock RPM Air Gap intake manifold
Scorpion roller rockers; 1.7 ratio

I don’t have the sheet from the first run when it made 598 HP. The second run it made 595 HP so we switched from the 850 Holley to a 950 Ultra XP and bumped the timing up by 1.5 degrees. It really surprised us by making 623 HP @ 6000 RPM and 604 ft-lbs @4900 RPM. Hope y'all like it!
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1957 Bel Air sport sedan
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That will certainly make your car move!
 

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I like a low LSA they make for great power but rough low vacuum idle. I would like to hear a video of it when its in the car running! I'm sure you know that and don't care . Let us hear that beast!
 

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Hope you are planning on a manual or hydraboost brakes wont have much vacuum with that much overlap out to be fun
 

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The narrow LSA does make for a pretty lumpy idle, but also helps with HP. I'm amazed at what a difference a cam, and good heads do to any 454 Chevy. Add a good piston, and this is the result. And it doesn't need to be stroked to 500 c.i. or more to get big HP either!
Really nice build!
 

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I have a 595/621 solid cam shortblock with those pistons and 2.19/1.85 valve 781 castings good for 11.14 in 1/4 in a 3400 pound car,[no driver], RPM intake and 800 dp.
 

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Discussion Starter #10
Here's a few videos for you guys:
With mufflers:
Without mufflers:
Dyno pull:

In the dyno video, the engine stumbles when the vacuum secondaries open. We sent that carb back to Holley and put on 950 Double Pumper. The engine picked up 35.8 ft-lbs and 35 HP from that change alone.
 

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Discussion Starter #11
I like a low LSA they make for great power but rough low vacuum idle. I would like to hear a video of it when its in the car running! I'm sure you know that and don't care . Let us hear that beast!
Yep! It makes a whole 7 inches of vacuum at idle.
 

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Sounds good! I have a very similar spec’d 489, but with iron 781 heads. I was estimating 550-575 HP, but based off your Dino experience it may be closer to 600 HP. Best quick carb tuning yielded about 7.5-8 inches of vacuum so I too am researching hydro boost units.
 

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Ya know what I heard on that dyno video? Well, I used an audio enhancing app to translate 454 grunt into English....

It was saying, "blower, I need a blower!"

Sincerely,
The Big Block Whisperer

😆
 

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Nice! That's some serious power with a small cam. I'd drop that dual plane intake and put a single plane on it...no need for that with such a big motor. I bet you'd pick up 25+ horsepower easily. That aint a 350 SBC!
 

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Discussion Starter #18
Nice! That's some serious power with a small cam. I'd drop that dual plane intake and put a single plane on it...no need for that with such a big motor. I bet you'd pick up 25+ horsepower easily. That aint a 350 SBC!
I think we'll pass for now... we're ready to start shoehorning this thing in the car!
 
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