4 bolts per port Hooker Headers in a mustang.

Today wasn't as humid and only 80 degrees so I pulled a couple of plugs that have been running on my 850. They don't look lean maybe a bit rich nowhere near melting parts. The wideband reads 12.5-13.5:1  I don't have a data logger so that what I see when I look. I found a couple of procedures for calibrating, but I ran out of sweat. I can't explain why I saw 10:1 with the 950 but it definitely felt happier. Someone gave me a 950 so now I have one to play with.

i’m not really worried about the wide band at this point more curious as to why it likes the 950s so much more. If it needs a 950 I’ll buy one. I just can’t mess with this one cause it’s not mine.. I have my 850 back on there because I gave him his carburetor back and I got my 12 1/2 -13 to one AFR.

Hi guys been fighting a few issues with my 464 for a while. Had the Victor ported yrs ago and they broke into the push rod tubes I talked about that a few yrs ago. I resolved that by replacing all the tubes etc. SO last week I had enough of the way it ran and did a smoke test. Long story short seemed to be the carb base at the manifold. In the process of diagnosing I had borrowed a Holley hp950. I left it on there so I didn't change more than one thing at a time. I went to a car show on Sunday and the car felt amazing throttle was crisp pulled like it never did before. Idle sounded more radical. Today I put my 850 dbl pumper back on and my butt dyno and my deaf ears says its not the same. The motor was on dyno when i picked it up was supposedly 624 hp with that same 850 on it. Is it typical for these big cu in to want a lot of carb. Also the 950 was 10:1 most of the time on the wide band and the 850 was 12 or 13:1 most places in the rpm range.  I did pull some jet on the 950 but was still pig rich. Its not my carb so I didn't mess to much with it it had 74 primary and 84 secondary


       Thanks in advance
                Harry

Theres not much to a starter. Is it one with a solenoid? Bypass the solenoid is one testing option. If you took it apart does it have brushes? Check continuity with a meter. Not much else I can suggest without more info.

I have the Spal fans and they do a great job. I also had a champion radiator and it didn't cut it on 464 cu.in. I bought a Summit 3 pass rad and it stays at 180.

Can someone please tell me intake and exhaust valve sizes for Barrys CNC ported Edelbrock stage x heads. I sending my carb to Pro Systems to be rebuilt. I cant seem to find it on Barrys website. Thanks  Second question is 850 big enough or should I go 950?         Harry