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Big block question
#1570950
01/29/14 10:29 PM
01/29/14 10:29 PM
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Joined: Feb 2008
Posts: 128
West Michigan
76318dart
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Posts: 128
West Michigan
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Hey there everyone. I have a question for my brother. Im not familiar with big blocks that all I have done is smallblocks. My question is what is a good all around intake for a mild built 440?
We got his car with this motor in it. It a 69 fury, big heavy car lol. We put 3.91 gears in it. well as far as we know it has a 509 mp cam and 11:1 pistons and stock heads ( not sure what they are or if they are touched) Right now it has a stock intake on it and feel like its not working well. The carb is a holley 750 3310. The other ? is it has a stock torque converter in it and was wondering what you recommend? I appreciate your help thanks.
76 dart 318 runs 12.9o @ 103 mph with 1.78 60ft.
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Re: Big block question
[Re: sam64]
#1570952
01/29/14 10:40 PM
01/29/14 10:40 PM
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Joined: Jun 2006
Posts: 5,161
CT
GTX MATT
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master
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3000 stall converter, gears are good. Performer RPM would probably be best in his application, Holley Street Dominator if he doesn't have the hood clearance. If its a true 11:1 440 with the 509 if its got headers it should rock and roll if its tuned decent. Distributor needs a quick curve and 36-38 degrees of total mechanical advance. It should have been degreed in, but the type of people who put 509 cams in with stock converters usually don't degree their cams.  If it had 2.76s or 2.94s when he bought it I will be you money that the cam is installed dot to dot and around a 112 ICA. If it has stock manifolds still you may be better off with a cam swap to a smaller cam as far as price/ease of getting it running better. If he wants and easy low 13 or high 12 second c body fix the rest and leave the 509 in there. They're old school but MAN do they pull hard for stock headed engines when set up right.
Last edited by GTX MATT; 01/29/14 10:45 PM.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: Big block question
[Re: GTX MATT]
#1570953
01/29/14 11:02 PM
01/29/14 11:02 PM
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Joined: Feb 2008
Posts: 128
West Michigan
76318dart
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Posts: 128
West Michigan
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Okay thanks. It does have Headers and it did have 2.76 gears. I appreciate your response
76 dart 318 runs 12.9o @ 103 mph with 1.78 60ft.
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Re: Big block question
[Re: dogdays]
#1570956
01/30/14 01:22 AM
01/30/14 01:22 AM
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Joined: Feb 2008
Posts: 128
West Michigan
76318dart
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West Michigan
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Well I do agree with you guys but the thing is he doesn't make much money and is still in high school so just trying to improve on what hes got for now. but thanks
76 dart 318 runs 12.9o @ 103 mph with 1.78 60ft.
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Re: Big block question
[Re: dogdays]
#1570957
01/30/14 03:49 AM
01/30/14 03:49 AM
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Joined: Jun 2006
Posts: 5,161
CT
GTX MATT
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If you need to fix it for the cheapest cost, the big summit cam is like 120 with lifters. Whatever valve springs work for the 509 would be more than enough for it, assuming someone changed the valve springs. You should probably check pushrod length too. But, people who put 509 cams in C bodies with 2.76s and stock torque converters also don't change pushrods, probably not valve springs either but MAYBE.
Last edited by GTX MATT; 01/30/14 03:52 AM.
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Re: Big block question
[Re: dogdays]
#1570961
01/30/14 05:18 PM
01/30/14 05:18 PM
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Joined: Feb 2008
Posts: 128
West Michigan
76318dart
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West Michigan
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Honestly we were told that it was 11:1. He can't run pump gas otherwise it runs like crud and spark knocks so I'm sure that it is that much compression or more. I know the when we did a compression check it was like 220ish.
76 dart 318 runs 12.9o @ 103 mph with 1.78 60ft.
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Re: Big block question
[Re: 76318dart]
#1570962
01/30/14 05:28 PM
01/30/14 05:28 PM
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Joined: Jun 2006
Posts: 5,161
CT
GTX MATT
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If it really pumped 220 and has a 509 then it has 11:1 or more, and a healthy short block. If thats the case I wouldn't go with a smaller cam!
The converter and intake will hold you back, but that thing should still rip. If it doesn't i'd start looking at the carb and spark curve.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: Big block question
[Re: GTX MATT]
#1570963
01/30/14 05:49 PM
01/30/14 05:49 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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The problem w/a bigger cam to bleed off cyl. pressure is that you`re fighting a heavy car and the vert would have to be a bit looser in my opinion to take advantage and maybe even more gear. Race gas or a stouter/proper cam may get ya there........... 
Last edited by Thumperdart; 01/31/14 12:45 AM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Big block question
[Re: Thumperdart]
#1570966
01/30/14 06:25 PM
01/30/14 06:25 PM
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Joined: Dec 2003
Posts: 2,586
Illinois, Indiana, Louisiana
ProStDodge
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master
Joined: Dec 2003
Posts: 2,586
Illinois, Indiana, Louisiana
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As CAB pointed out, if the car has power brakes, a different cam should be used. The .509 does not make enough vacuum for the brakes. Another option could be to install an electric vacuum pump, but that would cost about the same as finding the right cam. I tried the .509 in my 70 R/T convertible in 1984. Switched back to the .484 cam after I could not bring the car to a stop.  Scott
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Not good 
) to get the best perforamnce out of that cam 
. A REAL MOPAR MAN !! MY 
