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My 493 is a .030 over 440 with a 4.15 crank. I use the basic Indy EZ heads as when I built this eng in 2011 there was no TF heads for the BB Mopar. I run a 727 with a Dynamic 9.5 converter and 4.30's with a 30" tall tire. My 850 is about 20 years old so its an older one. Once I jetted it for...

Just run a vented gas cap. Ron

I run the basic Holley 850 DP. Its on my pump gas 493 in my 63 Sport Fury. Has run 10.70's with the 850 and was no faster with a 950. I have a few mods done to the 850 and its has great driveability and works nice at the track. The car drives so good with the 850. Ron

Hence the reason to drill the throttle plates. Thanks for the good pics "Sweet5ltr" The setup is that you want the throttle transition slot as shown in the pic at about a square. Once its set there if you change the idle speed by the idle speed screw it changes the transition slot. And if you...

I dont have any problem with my 850 Holley doing that. I run 92 and 93 pump. Course I also run an electric fuel pump which helps. But it fires up right away unless pretty cold out as I dont wait for the fuel pump to run long I crank it right away. Ron

None for me as I still tune as I did all my life on my carbs. Ron

I run the TTI 3" exh system out to the rear bumper. I use an X-pipe and Dyno-Max Ultra-flow mufflers. Its not really all that loud until I nail it then its a bit louder. I love it though as its just right for me since at 65 I dont need it to loud for my old ears. Ron

You know I grew up in the 60's and 70's and I have been around muscle cars since about 1970 and I just got used to wanting to hear that electric pump run when the car was running. So a little noise from an electric pump makes me smile because I know its working. :thumbsup: Ron

Bob I bought my roll of aluminum line from Mancini about 20 years ago as it was listed as fuel line. And its worked fin all these years but I dont use A-N fittings on it as I have heard that the aluminum can crack at times when tightened down with A-N fittings where the line is flared some in...

Its best to mount pump lower then gas tank if you can and as close to the tank as you can. Also today they make in the tank electric pumps for carb cars which is actually the best way to do it but I have run Holley pumps since the 70's with no problems at all. Myself I run the Holley black pump...

Myself I never waste my time with a mech fuel pump on my hotrod. The electric pump is better in everyway when fuel is being pushed up to the carb and not pulled under a vacuum. Electric helps fight vapor lock also much better then a mech pump so if you get real hot summers and run pump gas as...

This is right. That emission valve just would advance the ign timing on hard decell by sending manifold vacuum to the vacuum advance on hard decell to help with emission's. As someone said most just dont use it but if your restoring a car back to 100% original then you will want to use it...

Thats true as many older carbs in some of my older books have anti-siphon's listed in them and in many respects they look to do just what an air bleed does and it looks like many can act as both. Ron

They are basically where the main air bleeds mix with the fuel. Its alot more to them but thats the function they do. And I agree as most said for basic normal to mild combo's you dont have to get crazy into them. All the older Holley's like my 850 are not adjustable as they have no jets in...

I also dont run a choke on my hotrods. But I like and always use Holley Double Pumper carbs which are easier to start in colder winter weather with no choke since it has 2 accel pumps. I live in Md where the winter can average from about in the 20's F to in the 40's or 50's on real sunny days...

Actually that hole is to vent the top side of the pump diaphram. If not and the top was sealed it would cause some pressure and vacuum to build on the topside of the diaphram. Course if the diaphram sprung a small leak much of the fuel can go out the hole but the diaphram may push more fuel...

Actually a stock type carb choke will even be closed all the way on an 80 to 90 degree day if the eng is cold and has not been started all night. But its tension will be much less then a very cold eng. If you step on the gas a tad the choke will close but on very hot weather will have less...

Yep as said thats the external bowl vent. And it should be open at curb idle which is why the accel pump arm lifts it off its seat at curb idle. Then once on the gas it should close so all bowl venting is dont by the internal bowl vent when driving on the gas. Ron

Well said. Ron

Never mind as I read your post wrong.