How many inches vacuum at idle?
Put in the plain silver step up springs, and pull the top of the carb and check the float adjustment. Rarely are they correct.
13-15 at idle. I can re-check this afternoon, but that's where my memory is taking me. And Yessir, beat you to that one. I pulled it apart when I got it to check floats and clean up anything that needed it. Used the drill bit technique and they were spot on. It's got the stock red/pinkish springs in there now
A short crank would make it 427 - 440 cid.
Do you have a clue how long the engine has been together?
Sounds like a 750 Holley type might fit you good. Should give you nice response. Some run larger.
HEI has limitations in factory form.
Have you adjusted the lifters?
I ran a 750 dp, accel ignition, old torquer II, same trans on a 440 cid and it ran mid to low 11's.
Definitely don't have an exact date and you know what happens when people assume...so i'm going to assume, based on cleanliness, how the rockers/springs looked, and general feeling about the car, I think this was re-done in the past year or two but not driven much. Between the awkward wiring I re-did, and how loose stuff was, I think someone had a trailer queen put together to take to shows and then unload back in their garage. For lash, I want to say they were mid .02s. Kinda embarrassed I don't remember details from only 3 months ago. Covid brain...
I did the math on carburetor size. At 460 cubic inches, if you're spinning it to 6,000 RPM, it needs 798.6 CFM at 100% volumetric efficiency.
The 750 Edelbrock is chocking it up.
And...with good heads VE can go over 100% at peak RPM!
If you're going to change the carb, an 850 Holley should work well.
> Do you have a buddy you could borrow one from?
> 850 CFM jetted correctly and 36 degrees of peak timing - all in by 2500 - 3000 RPM- you might find another 50 Horsepower.
> My assumption for 36 degrees of max timing assumes good gasoline.
> What's the compression ratio?
Keep us posted.
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I had a feeling. Thank you for running that math, that will be the next tidbit to learn what the formulas are. I'll poke around in the community here and see if anyone has an 850 out there. Either way, I haven't been a huge fan of the Eddie and was already kicking around the debate of going to a Holley or biting the bullet for the sniper since I drive the car a lot. "Good" gas is thankfully something I have access to here in SC; 93 but with 10% eth blend. Still on the hunt for a no eth station with 93.
I wish I had info on the build like CR, cam, crank, and rods. Realistically, prob in the 9s on CR...another assumption! Heads are the stock irons from a 73 Chevelle 454, I don't have a scope to shoot down the intake to see if they have been worked over or not. Eventually, i'm going to work up a nice build on the engine. But for now, ironing out this fueling and possibly considering an RPM air gap 2 for that dual plane smoothness. She's such a strong runner right now, just can't justify ripping it apart for for the few wrinkles that need to be worked out.
Either way, I know the exhaust is a choke point as well with iron manifolds, but does have 2.5 exhaust with an H pipe.
Threw in an under the hood pic, just cause!