Carb Hunting

[Blowout]

So sounds like a 70 383 holly is out due to cfm. 440 Carter will do the job since rated at the 750 cfm and good comments above.  Or something new in 750-800 cfm range. Kind of leaning towards the Carter idea. But guess not sure how hard it'll be to find a 4740 or 4741.

Really appreciate the great feedback.

[JS29]

I put a quick fuel 750 on my 383, Love it, great throttle response easy start-ups.   

[moreparts]

Nice, sounds like you've got a good one. I wonder if maybe he has a bad casting or warpage somewhere. I've heard people talk a lot about these carbs being prone to carb fires back in the day, replaced under warranty with a Carter AVS, on and on. Not sure how true it all is but the rumors seem to persist.

I've got my own 383 due to escape from engine rebuild jail soon and have a Holley 4369 (1970 383 with a/c) core for it but not at all sure I want to go through with the rebuild on the carb after what my brother went through.

One thing I did notice and really like about the Holley was his car would start almost instantly after turning the key where the AVS would take a little more cranking to get it going. Same thing on my 340 with a ThermoQuad.

He ended up going with an Edelbrock AVS2 800cfm at the recommendation of Mike Bonsanti at HP Motors, a local and well-known FAST engine builder in the hobby. Engine is .030 over with a slightly warmer Lunati cam but otherwise mostly stock now, likely soon to evolve into a stroker and different pistons, cam, intake, possibly headers. But it doesn't seem over-carbed even now.

I'd bet dollars to donuts it was warped in the metering block.  Sometimes some sanding can get those back if it's done well or you could get a replacement one but it would have the right numbers.  And yeah, those start ups are really great.  It gives my Challenger an almost modern car feel to it.