what ta dooo...what ta dooo

[tpodwdog]

ok...im getting a bug up my you know what to hypo my stock 383 automatic 70 roadrunner. my 1st roadrunner i went all balls out on building the engine...it also was a 383 and when i was done..IT WAS A SCREAMER. i dont want to get into all that again but heres what i want it to do:

1. i want to put a cam in it but i dont want to have to change all the pistons...rejet the carb...get a new intake bla bla bla.......because it runs great now, i just want a bit more

2. i want to put a throatier exhaust on it but i DONT want to dikk around with headers,,,from what i remember theyre a pain in the ***.

3. what are the new cams out there ( i been out of this for 30 years) that i can put in and thats all i have to do, and still have it run great???

i am not 100% sure i am even going to do this,,,,but i might if all i have to do is change the cam. any and all input would be great.ottytrain3:

 

[68sportsatelliteragtop]

You know how it works, 1 thing leads to another. If you just want a rough idle stick in a small purpleshaft. If you are going for a cam, may as well change out the intake while you got it apart.If you want it to run strong, open up the exhaust with headers and/ or high flow mufflers. Its really a disease, once you get started it's hard to stop! New cars are easy, add an air box and a programmer and dial up the HP!

 

[Budnicks]

Yep

You know how it works, 1 thing leads to another. If you just want a rough idle stick in a small purpleshaft. If you are going for a cam, may as well change out the intake while you got it apart.If you want it to run strong, open up the exhaust with headers and/ or high flow mufflers. Its really a disease, once you get started it's hard to stop! New cars are easy, add an air box and a programmer and dial up the HP!

:iamwithstupid: Very well said...

 

[Meep-Meep]

In keeping with your requirements of not changing pistons or adding headers you are pretty limited in cam selection if you want a really nice driver. Any time you put in a high overlap cam your compression should go up as well or your bottom end and throttle response will suffer. All I can say is be conservative on the cam selection. Keep the lobe separation at 112 or higher and the cranking compression at 175 PSI to handle pump 91. With manifolds, a split pattern cam usually works best. Also run larger than stock exhaust pipe like 2.5" with 2.25" tails. A cheap .4 - .5 point of compression increase can be done by substituting the composition head gaskets for steel shim. Adding a set of factory closed chamber heads will bump it another .5 point but that's not cheap!

 

[tpodwdog]

You know how it works, 1 thing leads to another. If you just want a rough idle stick in a small purpleshaft. If you are going for a cam, may as well change out the intake while you got it apart.If you want it to run strong, open up the exhaust with headers and/ or high flow mufflers. Its really a disease, once you get started it's hard to stop! New cars are easy, add an air box and a programmer and dial up the HP!

yeah...i know how it is 68 dude...but being that i have not built an engine since i was 20 and did it in the bedroom of my trailer (true story yes i was poor white trailer trash in my yout ),,,i thought MAYBE that there was a CHANCE that PERHAPS there might be something modern that could give me what i was looking for , but i DO know that everything is connected to everything else, and i just dont want to get into all that again, thanx guyz for all the input...'presheeate it !:headbang:

 

[bigmanjbmopar]

What about a bigger CFM carb? no cam change?

 

[Meep-Meep]

What about a bigger CFM carb? no cam change?

The stock carb has plenty of total CFM, however a carb that is designed for today's fuel will be a benefit. 600 - 650 CFM on a stock 383 should be plenty. Or if you really want to have the ultimate in drivability go with a fuel injection setup.

 

[Budnicks]

yep

In keeping with your requirements of not changing pistons or adding headers you are pretty limited in cam selection if you want a really nice driver. Any time you put in a high overlap cam your compression should go up as well or your bottom end and throttle response will suffer. All I can say is be conservative on the cam selection. Keep the lobe separation at 112 or higher and the cranking compression at 175 PSI to handle pump 91. With manifolds, a split pattern cam usually works best. Also run larger than stock exhaust pipe like 2.5" with 2.25" tails. A cheap .4 - .5 point of compression increase can be done by substituting the composition head gaskets for steel shim. Adding a set of factory closed chamber heads will bump it another .5 point but that's not cheap!

:iamwithstupid: well said.... great advise...

 

[tpodwdog]

What about a bigger CFM carb? no cam change?

right now as it sits, there is a holley 4 BBL on it. it works perfect with the air grabber hood and gasket. i believe the holley is a 650 cfm and its brand new put on by the dude i bought it from. this engine is set up perfectly and thats why i am apprehensive to F*$@ with it. the fast idle is perfect and i doubt the starter turns even once when starting hot or cold. absolutely no issues what-so-ever. it fires right up everytime ! maybe i will just leave well enough alone. i got all my ya-ya's out when i was a kid ...i just wanted to see if there was anything available that was modern ! thanx a million guyz!:headbang:

 

[iraqivet01]

Only updated things you can do is to upgrade to fuel injection or roller cam.
But if it not broke, and your happy with what you have, I would leave it alone.

Both can be pricey, and you might not be happy with the performance results, compared to with what you have now.

 

[Meep-Meep]

I'd be inclined to not make any big changes if it runs that well. However I would want some data out of it. Do a compression check and plot the timing curve. Almost any engine can do better by dialing in the timing. Focus on maximizing what you have.

 

[bigmanjbmopar]

After building my stroker 440 to 493 and spending ALL SUMMER getting it dialed in I would say just leave it alone and go freakin enjoy the **** out of it I am finally getting to enjoy long drives in my beast lol good thing we have good dry weather here right now.

 

[tpodwdog]

yeah...thanx for the input guys but i think i will leave well enuff alone! "if it aint broke,,,,,dont fix it"

 

[Finallygotmine]

ok...im getting a bug up my you know what to hypo my stock 383 automatic 70 roadrunner. my 1st roadrunner i went all balls out on building the engine...it also was a 383 and when i was done..IT WAS A SCREAMER. i dont want to get into all that again but heres what i want it to do:

1. i want to put a cam in it but i dont want to have to change all the pistons...rejet the carb...get a new intake bla bla bla.......because it runs great now, i just want a bit more

2. i want to put a throatier exhaust on it but i DONT want to dikk around with headers,,,from what i remember theyre a pain in the ***.

3. what are the new cams out there ( i been out of this for 30 years) that i can put in and thats all i have to do, and still have it run great???

i am not 100% sure i am even going to do this,,,,but i might if all i have to do is change the cam. any and all input would be great.ottytrain3:

when I bought my 69 RR I was told that the engine was stock. Come to find out it had a 509 Purple cam in it. The rest was stock. It didn't run that well. No vacuum. A well running engine needs a good combo of stuff. Simply changing one piece may not give you what your after. However, after lots of reading, if I were to change only one thing, It would be getting the heads done to let it breath better.

 

[MarPar]

plugs, wires, new dist., and more timing! cheap and quick....and if you bump the timing a bit and don't like it, dial her back! :headbang:

 

[kdtjb]

From the looks of things that car doesn't need any help. It's gorgeous. And if I spelled gorgeous right i'll eat my hat.

 

[tpodwdog]

if i do say so myself....it is gorgeous...and dead *** bone stock ..(except for the superbird decals that i just HAD to have)...and it does run great too. i doubt theres a hot cam in it.....but there might be,,,i never checked. thanx for the help guyz!!!