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383 build for daily driver. Power/fuel mileage #1025459 07/03/11 11:19 PM 07/03/11 11:19 PM
Joined: Mar 2003 Posts: 4,923 Tri-Cities, Washington V VITC_GTX OP master
VITC_GTX OP master V Joined: Mar 2003 Posts: 4,923 Tri-Cities, Washington	Looking to rebuild the 383 for my �71 SSP. I want this car to be a daily driver with A/C so pump gas, good vacuum and decent fuel mileage is a must (I know not to expect much on fuel mileage but I would like to get 15+ mph if possible). In fact, I don�t want too much horsepower (is that possible?) because if I have it I will want to use it!!! Heads will be stock 906's. Thinking of a stock-ish engine build but was hoping to take advantage of newer technology. What do you suggest for a decent build (pistons, cam, carb & manifold)?

Re: 383 build for daily driver. Power/fuel mileage [Re: VITC_GTX] #1025460 07/03/11 11:42 PM 07/03/11 11:42 PM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	I guess you'll want a nice light weight piston...so That's be a diamond or Wisco. (not cheap) Then it's all on your machine work. for cam a new custom grind would be best but off the shelf the MP 528 solid is a really good cam for a stockish motor. I think you need to decide how much motor you want and how many MPGs you want. I'd think a good tune on a stockish 383 could net 18-20mpg hwy. [IMG]http://i66.tinypic.com/pui5j.jpg[/IMG] Coming soon!!!!

Re: 383 build for daily driver. Power/fuel mileage [Re: Mr.Yuck] #1025461 07/04/11 07:05 AM 07/04/11 07:05 AM
Joined: Nov 2009 Posts: 2,275 Desert Tracker H HYPER8oSoNic top fuel
HYPER8oSoNic top fuel H Joined: Nov 2009 Posts: 2,275 Desert Tracker	"Stupidity is Ignorance on Steroids" "Yeah, it's hopped to over 160" (quote by Kowalski in the movie Vanishing Point 1970 - Cupid Productions)

Re: 383 build for daily driver. Power/fuel mileage [Re: HYPER8oSoNic] #1025462 07/04/11 10:15 AM 07/04/11 10:15 AM
Joined: Jan 2003 Posts: 28,067 Irving, TX feets Senior Management
feets Senior Management Joined: Jan 2003 Posts: 28,067 Irving, TX	A 528 solid cam is not going to be very street friendly in a pump gas 383. It surely won't get decent mileage. Talk to the cam grinders. They can come up with a better and more modern grind than that old MP stick. We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon

Re: 383 build for daily driver. Power/fuel mileage [Re: Mr.Yuck] #1025463 07/04/11 01:27 PM 07/04/11 01:27 PM
Joined: Mar 2003 Posts: 4,923 Tri-Cities, Washington V VITC_GTX OP master
VITC_GTX OP master V Joined: Mar 2003 Posts: 4,923 Tri-Cities, Washington	I have to say that I am confused. I never would have thought a solid cam with that much lift and duration would work well at all for my needs. I have a 284/484 cam in my 440 and it has no vacuum and a very choppy idle and poor fuel mileage. I guess I just don't understand cams well enough... I was thinking something a little less money on the pistons as well. Any others have cam/piston suggestions?

Re: 383 build for daily driver. Power/fuel mileage [Re: VITC_GTX] #1025464 07/04/11 01:38 PM 07/04/11 01:38 PM
Joined: Nov 2008 Posts: 1,565 tennessee P pushbutton pro stock
pushbutton pro stock P Joined: Nov 2008 Posts: 1,565 tennessee	Quote: I have to say that I am confused. I never would have thought a solid cam with that much lift and duration would work well at all for my needs. I have a 284/484 cam in my 440 and it has no vacuum and a very choppy idle and poor fuel mileage. I guess I just don't understand cams well enough... I was thinking something a little less money on the pistons as well. Comp XE-268 Any others have cam/piston suggestions?

Re: 383 build for daily driver. Power/fuel mileage [Re: pushbutton] #1025465 07/04/11 01:50 PM 07/04/11 01:50 PM
Joined: Feb 2003 Posts: 10,200 Someplace you aren't S SomeCarGuy I Live Here
SomeCarGuy I Live Here S Joined: Feb 2003 Posts: 10,200 Someplace you aren't	A new grind that is close to HP specs should work great. 15+ MPG won't be hard at all. Pistons are an issue. Seems like most are a compromise. Might be worth it in the long term to spend a few hundred extra and get a custom set. If you don't get the CR right, it will be harder on fuel and low on power. By the time you do some milling to make everything work w/ shelf pistons, wouldn't be that much more. I want my fair share

Re: 383 build for daily driver. Power/fuel mileage [Re: VITC_GTX] #1025466 07/04/11 01:58 PM 07/04/11 01:58 PM
Joined: Nov 2004 Posts: 843 Suffolk,VA I ireland383 super stock
ireland383 super stock I Joined: Nov 2004 Posts: 843 Suffolk,VA	Quote: Looking to rebuild the 383 for my �71 SSP. I want this car to be a daily driver with A/C so pump gas, good vacuum and decent fuel mileage is a must (I know not to expect much on fuel mileage but I would like to get 15+ mph if possible). In fact, I don�t want too much horsepower (is that possible?) because if I have it I will want to use it!!! Heads will be stock 906's. Thinking of a stock-ish engine build but was hoping to take advantage of newer technology. What do you suggest for a decent build (pistons, cam, carb & manifold)? If your running HP manifolds you might run the Comps 275DEH like i'm using 235/482 it pulls 12" of vacuum at idle with power brakes. Use the KB400 pistons, mill the heads .030 to get you around 84cc. Maybe a 670 street avenger carb (i'm using a 3310 750), you should be pretty happy and still get decent mileage if you keep your foot out of it . I'm running 3.91's now, you might want to use 3.55's or less for mileage.

Re: 383 build for daily driver. Power/fuel mileage [Re: ireland383] #1025467 07/04/11 02:11 PM 07/04/11 02:11 PM
Joined: Oct 2005 Posts: 1,305 Lakewood, Colorado herkamer pro stock
herkamer pro stock Joined: Oct 2005 Posts: 1,305 Lakewood, Colorado	Fuel economy = short duration, low lift cam and small carburetor. I have a Crower 267/271 cam in my 383 which is close to the stock 4 bbl cam which is good for performance but not for economy. Look at their Baja Beast or maybe the Mileage Compu-pro cam. 250ish duration (200 at .050),.420ish lift and 112 centerline. I would go with a 500 cfm 4bbl for the ultimate in mileage. When gas wasn't garbage, a friend of mine could get 20 mpg highway out of a 440 with that combination. Matt 69 Dart Swinger 340 83 W350, Megasquirted with 46RH Old news: 72 Demon street/race mobile Latest: 70 Duster backhalf car and even more

Re: 383 build for daily driver. Power/fuel mileage [Re: VITC_GTX] #1025468 07/04/11 03:06 PM 07/04/11 03:06 PM
Joined: Nov 2006 Posts: 1,456 oklahoma F forphorty pro stock
forphorty pro stock F Joined: Nov 2006 Posts: 1,456 oklahoma	Sounds like you want something similar to a 68-70 RR engine. I don't have a recommendation on pistons. I just don't know what is out there for 383s. I would say whatever it takes to get to the 9:1 range. A cam in the 210 to 220 range at .050. I bet you would really like a 262xe Comp. I have a 268xe in a 400 and it works pretty well but i am using the 175k MP converter. If you are using a factory low stall i think the 262 would be a better choice. It's fairly similar to a stock RR cam but with a tighter lobe center and a hair more lift. Stock intake or DP4B. Perf RPM if you have the room. I like Holleys so i would use a 3310 750vs or something similar. I actually like the 4777 650 dp on engines that size but i am sure some will tell you that's a no-no for your project. A thermoquad would probably be great if you can find a good one. A bowl blend on the heads would be nice, recurved distributor, 1 3/4 headers.Could probably end up with a car that drove like a stock RR but is a good 1/2 second or more faster and and a couple MPG better too.

Re: 383 build for daily driver. Power/fuel mileage [Re: herkamer] #1025469 07/04/11 03:13 PM 07/04/11 03:13 PM
Joined: Nov 2006 Posts: 1,456 oklahoma F forphorty pro stock
forphorty pro stock F Joined: Nov 2006 Posts: 1,456 oklahoma	Quote: Fuel economy = short duration, low lift cam and small carburetor. I have a Crower 267/271 cam in my 383 which is close to the stock 4 bbl cam which is good for performance but not for economy. Look at their Baja Beast or maybe the Mileage Compu-pro cam. 250ish duration (200 at .050),.420ish lift and 112 centerline. I would go with a 500 cfm 4bbl for the ultimate in mileage. When gas wasn't garbage, a friend of mine could get 20 mpg highway out of a 440 with that combination. If fuel economy is more important than performance, this sounds like very good advice. Probably have very nice low end response too.

Re: 383 build for daily driver. Power/fuel mileage [Re: VITC_GTX] #1025470 07/04/11 09:26 PM 07/04/11 09:26 PM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	Quote: I have to say that I am confused. I never would have thought a solid cam with that much lift and duration would work well at all for my needs. I have a 284/484 cam in my 440 and it has no vacuum and a very choppy idle and poor fuel mileage. I guess I just don't understand cams well enough... I was thinking something a little less money on the pistons as well. Any others have cam/piston suggestions? 284/484 cam is awful for anything but racing. The 528 solid is way more mild. Solid doesn't = Race. I'd think a well tuned 383 w/ a 528 solid with Mani's or headers and 3.23's would get at least 16 probaly more... That said If mpg's is what you are after I'd call a cam guy and have a cam made for your application

Re: 383 build for daily driver. Power/fuel mileage [Re: VITC_GTX] #1025471 07/05/11 03:14 PM 07/05/11 03:14 PM
Joined: Jan 2003 Posts: 74,974 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,974 U.S.S.A.	383 piston choice is limited/sucks if you are going to use an open chamber head. You don't have to worry about running pump gas because the current crop of available pistons will keep you around 8.5 compression without block and head decking .

Re: 383 build for daily driver. Power/fuel mileage [Re: JohnRR] #1025472 07/05/11 11:17 PM 07/05/11 11:17 PM
Joined: Mar 2005 Posts: 3,138 Central NC gch master
gch master Joined: Mar 2005 Posts: 3,138 Central NC	A true 9.00-1 with some keith black(or cast for that matter)pistons would work well with a short duration cam like a xe256/262 or similar grind. small diameter long tube headers,dual plane intake with a t-quad or spread bore holley 650 vac secondary(or a well tuned 600 eddie),and a well curved distributor with vacuum advance. Any improvements to the head flow will return better efficiency for mpg and performance. A tight low stall converter (maybe a towing vert?)and some 2.76 gears will net you a nice highway mpg.

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