Carb Suggestion

[Quigley]

Working on a 401 Magnum and am going to put a 4 barrel carb on it. I am thinking a 650 Edelbrock and was wondering what some other thoughts might be? Also I am looking for a set of pristine magnum exhaust manifolds, I have a set, that have a couple of gouges in them. Thanks in advance, Dave :signthankspin:

[bigblockv6]

A 650 cfm sounds good but I would consider a cam upgrade to complement it. I do have performance specs for a regrind of your stock cam, here they are as well as anyone else that's interested:upyes:

[TJ's GMC]

650 would be a great choice....heck I used to have a 600 on my 305. :teehee: It likes the 500 eddy much better though.

[bigblockv6]

I'm pretty sure this is the regrind, I have given the specs to several members and they are using this cam grind in their 401M engines. One member didn't want to go with this grind and chose a milder grind. If you have doubts then contact someone that regrinds cams and ask them for their opinion.

[bigblockv6]

A 650 cfm sounds good but I would consider a cam upgrade to complement it. I do have performance specs for a regrind of your stock cam, here they are as well as anyone else that's interested:upyes:

The valve springs used with this cam are longer than stock due to more lift in the cam. My machinist used Competition Cams #972-16 valve springs that actually fit Ford 390 applications.:upyes:

[Firepower]

https://scontent.fdet1-1.fna.fbcdn.net/v/t1.0-9/22491636_10214071439236865_4330301035466114025_n.j pg?oh=e7eed71a8cbd1ec9fbedd32b05d49e8a&oe=5A7F891C

.425 lift seems what the factory manual calls, and open/close timing is generous, but tough to say what lash does to those numbers.

[Robert B.]

Quick question: is it necessary to replace the entire carburetor (Stromberg on my ‘63 3/4t, 305E V6) if the screw hole which retains the choke arm is stripped or incapable of holding a screw?? I believe it’s been rebuilt once.

Thank you,

Robert

[TJ's GMC]

Quick question: is it necessary to replace the entire carburetor (Stromberg on my ‘63 3/4t, 305E V6) if the screw hole which retains the choke arm is stripped or incapable of holding a screw?? I believe it’s been rebuilt once.

Thank you,

Robert

You could try a helicoil, but with how popular those carbs are I'd say find another.

[James]

Quick question: is it necessary to replace the entire carburetor (Stromberg on my ‘63 3/4t, 305E V6) if the screw hole which retains the choke arm is stripped or incapable of holding a screw?? I believe it’s been rebuilt once.

Thank you,

Robert

I would also helicoil it. I have done this many time with no problems. If you need to buy a kit be sure to also buy the correct drill bit that the kit call for.