[eloc431962]

Back to the orignal question. I ran a 670 avenger also and was very pleased. This was on my 355. And i really like the 3310 vac secondary also always had good luck with it as already stated.JMO


Cole

[355ci]

Originally Posted by eloc431962

So your speedo reads 145 and you are still pulling hard Hummmm!!!!!!!!!, how fast are you going then? You think and do you think your speedo is correct at that ?


Cole

I dont know.I know that the 86 IROC-Z did 150mph stock. WITH a 190hp 305ci. An a TPI that would only rev to 4500rmp. These are GM and ROAD&TRACK numbers. I dont know if the speedo is right, I dont get stopped on the highway. I run 75-78mph. Speed limit is 70mph

[sqzbox]

I had an 88 formula with a 305 and 700R4 and the rpm at speed was the same as yours, 70 mph in 4th at 2000 rpm converter locked up with the same size tires. Rear end ratio was 2:73:1.

[355ci]

Originally Posted by sqzbox

I had an 88 formula with a 305 and 700R4 and the rpm at speed was the same as yours, 70 mph in 4th at 2000 rpm converter locked up with the same size tires. Rear end ratio was 2:73:1.

Thank you SQZBOX

[355ci]

Originally Posted by eloc431962

Huh say what i am running a Holley 830 p Series carb and it was a official nascar carb at one time anyway. Hummmm has something changed? Where you at Cobalt ?



Cole

OK sorry. THE BUSCH series run 575hp limit @390cfm your carb is NEXTEL CUP 890cfm limit some series run 500cfm.But 575hp from 390cfm! SOMEBODY TELL ME HOW?

[AndersonRacing44]

Originally Posted by Madmax305

Huh, say what! I did not know that was possible.

correct me if im wrong but didnt the 440 come with a 6-pack? mabye its 3 390cfm carbs.

[AndersonRacing44]

Originally Posted by 355ci

what size is it?750-800cfm?hows the low end idle-3000rpm,mine has hesitations and flat spots.

Idk what CFM it is, all i know is that it was off a 454 BBC from an RV. and when i rebuilt it i think it had jet size 72's in it? some where in that region.

it had a little bobble with the stock exhaust manifolds on it, but after i installed the headers its great, just keeps pulling and pulling.

[eric32]

I have had different carbs over the years between holley, edelbrock and barry grant. I had both good experiences and bad with all three carburetors. Nowadays I have learned to take apart your carburetor and look it over and clean it and maker sure its safe to put on.

Bottom line I prefer holley style carburetors as I feel they are easy to rebuild and have more options to fine tune them as compared to edelbrock. I like the simplicity of the edelbrock carbs to do basic tuning wise but for anything performance I like holley style hands down. Reason I say holley style is I have a proform holley style carb on my other truck and it runs excellent.

I also have a holley 1850 600 cfm carburetor on my everyday driver and one shot of gas and it fires right up and makes my 350 with my other parts run like a raped ape. Have read good things about Q jet carb but have never used one. There the best for fuel mileage from reading about them.

Eric

[355ci]

Originally Posted by eric32

I have had different carbs over the years between holley, edelbrock and barry grant. I had both good experiences and bad with all three carburetors. Nowadays I have learned to take apart your carburetor and look it over and clean it and maker sure its safe to put on.

Bottom line I prefer holley style carburetors as I feel they are easy to rebuild and have more options to fine tune them as compared to edelbrock. I like the simplicity of the edelbrock carbs to do basic tuning wise but for anything performance I like holley style hands down. Reason I say holley style is I have a proform holley style carb on my other truck and it runs excellent.

I also have a holley 1850 600 cfm carburetor on my everyday driver and one shot of gas and it fires right up and makes my 350 with my other parts run like a raped ape. Have read good things about Q jet carb but have never used one. There the best for fuel mileage from reading about them.

Eric

Well put eric, My carb exprerience has been the same