383 runs like a giant turd WTF

roadrunnerh said
More info is needed. Who built this motor? Did they know what they were doing? what is the compression ratio? Was the block machined properly?
A 509 cam and 750 DP is not 1970 "stock specs".

That is because everything else is except the cam and carb. Which the pair are well known to make stock engines into turds.

383 runs like a giant turd WTF
So i have a 383 built to stock 70 specs with a mopar 509 cam and edle tourqer intake. I cannot for the life of me get this car to run good it idles great no burbles nothing smooth as can be crisp response running 750 dp. I checked the cam timeing its good, checked comp it was 140psi across the board. I even tried a 2 differnt carbs and same thing.

I talked to one guy and he said that the 509 sucks in a 383 now i could see it not working as well as some other cams but i not jokeing, a good running caravan could give this car a run for its $$$

car is around 3300lbs
4speed
3.55 gears

Which 70's 383 spec slug is in there. The HP 383 had a high compression slug. The "509" cam should see a honest 10-1 at a min. The torquer intake is killing all bottom end. Your idle issue's are caused by 2 things I can see up front. Single plane and big overlapping cam.

MoPar put out a second series of cams on a wider centerline in order to smooth idle and increase the street friendly-ness of the cam. The C-lines are 110 and recommended to be moved down (Installed) @ 108. The newer one is a 112. Big difference.

What size tire with the 3.55's?

An old buddy of mine had a dead stock except headers 383 RR (1970) and IMO, it was slow.