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05-31-2010, 11:24 PM | #1 |
3/4 Ton Rodder
Join Date: Jan 2009
Location: Manlius, IL
Posts: 1,146
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383 Guys, I Need Some Input.
Hey guys. I am looking into getting a street/strip ready 383 stroker. The guy I am getting it from says I'll get 12 MPG out of it as long as I don't put it to the floor. I am needing input on what MPG you 383 guys are getting. Can you shoot me some figures please?
Thanks Benjamin.
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1981 Chevy Scottsdale C20 "Orange Crush": SOLD 1989 Chevy Silverado K2500: All Stock (For Now), 350 TBI/700R4. DD/Light Duty Toy. |
05-31-2010, 11:40 PM | #2 |
I really hate wet sanding!
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Location: Brookfield, MO
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Re: 383 Guys, I Need Some Input.
If you are putting in a hopped up motor, why the concern with fuel mileage? I doubt a healthy 383 in the squares will get that good, well u less you let it idle as you hurl it off a big cliff.
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Jeff, 68 C-10 75 C-20, now a C-10! 10 F-150 |
05-31-2010, 11:46 PM | #3 |
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Re: 383 Guys, I Need Some Input.
Depends on how street/strip the motor is. Generally, if you're doing a 383 stroker you tend to put on parts that aren't gas mileage friendly....
I would say 10 or so around town, 12-14 hwy. Like the other guy said, why are you concerned with gas mileage with a 383?
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'69 Dodge Charger R/T 440, 727, 3.55 Sure Grip '68 Plymouth Road Runner 383, 727, 3.23 Sure Grip '89 Dodge Diplomat ex cop car 408, 727, 3.55 Sure Grip '77 Dodge Monaco ex cop car 440, 727, 2.71 '79 Dodge 'Lil Red Express pickup 360, 727, 3.55 Sure Grip '12 Dodge Challenger SRT8 392, M6, 3.92 '85 Chevrolet C-10 SWB 2wd 305, TH350, 2.73 |
06-01-2010, 12:30 AM | #4 |
gets board easy.......
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Location: Colorado Springs
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Re: 383 Guys, I Need Some Input.
what gears and tires also???
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06-01-2010, 01:03 AM | #5 |
3/4 Ton Rodder
Join Date: Jan 2009
Location: Manlius, IL
Posts: 1,146
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Re: 383 Guys, I Need Some Input.
The reason I'm concerned with mileage is that the truck is daily driven. The biggest reason I'm looking at getting it is the guy made me a deal I can't pass up on the engine he's selling. Race ready 383 stroker putting out 725 HP. for $700. He's also including a Fairbanks Stage 3 Street/Strip TH 350 or TH 400. That's why I'm wondering the mileage, it's too good to pass up.
My gearing is probably a 4:11 and my tires are factory size on 16.5 steel wheels.
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1981 Chevy Scottsdale C20 "Orange Crush": SOLD 1989 Chevy Silverado K2500: All Stock (For Now), 350 TBI/700R4. DD/Light Duty Toy. |
06-01-2010, 01:23 AM | #6 |
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Re: 383 Guys, I Need Some Input.
WOW! thats pretty far out. 700+ horsepower out of a street/strip 383? That guy is crazy, unless it has a supercharger or something. But if it really does have that many horses, its not going to be very streetable at all for a dd. just my .02
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06-01-2010, 01:51 AM | #7 |
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Re: 383 Guys, I Need Some Input.
725 HP out of a street/strip 383? Surely you don't believe that. Almost 2 HP per cubic inch huh.....
I've never heard so much BS about HP figures, engine displacements etc than I have lately both on the internet and the backyard jackasses I run into at car shows and such. April Fool's is long over....
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'69 Dodge Charger R/T 440, 727, 3.55 Sure Grip '68 Plymouth Road Runner 383, 727, 3.23 Sure Grip '89 Dodge Diplomat ex cop car 408, 727, 3.55 Sure Grip '77 Dodge Monaco ex cop car 440, 727, 2.71 '79 Dodge 'Lil Red Express pickup 360, 727, 3.55 Sure Grip '12 Dodge Challenger SRT8 392, M6, 3.92 '85 Chevrolet C-10 SWB 2wd 305, TH350, 2.73 |
06-01-2010, 11:10 AM | #8 |
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Re: 383 Guys, I Need Some Input.
I have a 383 in mine and it was put on the engine dyno and I get about 5 to 8 miles to the gallon and it has 405hp and 440tq.
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06-01-2010, 11:41 AM | #9 |
3/4 Ton Rodder
Join Date: Jan 2009
Location: Manlius, IL
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Re: 383 Guys, I Need Some Input.
That figure IS NOT what my particular engine has, it is what a nearly identical engine in a mud truck is running.
The engine I am getting has 2 950 Holley double pumpers topping a tunnel ram, its had the heads worked, ported and polished, 1/4 or 3/4 solid race cam, high flow water pump, and I think he said it has Hooker headers with 2 inch primaries and a 3 inch collector. IDK much about the internals and neither does he because this engine was built by his fathers race shop about 4 years ago. He is a professional racer though. He runs in the class directly under the funny cars. Even if it doesn't live up to the numbers he's giving me, it'll still have more power than my Goodwrench "Target" 350 that has maybe 250 HP. I'll be happy with it either way cause I can guarantee it to have more power than I have now.
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1981 Chevy Scottsdale C20 "Orange Crush": SOLD 1989 Chevy Silverado K2500: All Stock (For Now), 350 TBI/700R4. DD/Light Duty Toy. Last edited by Scootin 81 C20; 06-01-2010 at 11:43 AM. |
06-01-2010, 11:54 AM | #10 | |
I know the pieces fit
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Location: MONTGOMERY, AL
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Re: 383 Guys, I Need Some Input.
Quote:
And there's no way anyone would sell a motor like that for that price in their right mind. The carbs alone cost more than that. This falls under "If it's too good to be true... " |
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06-01-2010, 12:00 PM | #11 |
3/4 Ton Rodder
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Re: 383 Guys, I Need Some Input.
Bruiser, the guy has 9 of them sitting in crates. They've been sitting for 4 years and he's almost 60 years old. The mileage can't be much worse than what I get now running down the road at 2,500rpms.
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1981 Chevy Scottsdale C20 "Orange Crush": SOLD 1989 Chevy Silverado K2500: All Stock (For Now), 350 TBI/700R4. DD/Light Duty Toy. |
06-01-2010, 12:17 PM | #12 |
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Re: 383 Guys, I Need Some Input.
You're gonna hate driving an engine like that on the street, despite what you think.
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06-01-2010, 12:39 PM | #13 |
On a budget like Fred Sanford
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Re: 383 Guys, I Need Some Input.
I don't even know where to start on this one.
You're likely going to be able to watch the gas gauge move. Who says this thing will even run on pump gas? A "3/4 race cam and worked heads" tells you zip about that motor, it could be a high compression lump that doesn't get up on the cam until 4000rpm. Just because it's a good price doesn't make it a good deal or even a good idea.......
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'85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD |
06-01-2010, 01:05 PM | #14 |
3/4 Ton Rodder
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Re: 383 Guys, I Need Some Input.
Here's my other choices, all SBC. 377, 383, and a 409.
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1981 Chevy Scottsdale C20 "Orange Crush": SOLD 1989 Chevy Silverado K2500: All Stock (For Now), 350 TBI/700R4. DD/Light Duty Toy. |
06-01-2010, 01:38 PM | #15 | |
I know the pieces fit
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Location: MONTGOMERY, AL
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Re: 383 Guys, I Need Some Input.
Quote:
Anyway, I didn't post anything to be rude or anything. Honestly, it's just flat out fishy as hell and I think he's trying to get one over on you because of your age. I'd hate to see you spend that money and end up with something that ran poorly. |
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06-01-2010, 02:28 PM | #16 |
Truck and auto performance nut
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Re: 383 Guys, I Need Some Input.
If these motors truly have massaged 700+hp parts in them...then they are probably worth more then $1 per hp.
My 383 stroker has a single holley 650 on a Holley street dominator manifold and has a small Melling cam (maybe someone somewhere might call it a 1/4 race?) and makes maybe 400hp/400+tq at the crank. With 3.73's it might get 12mpg on the highway. An overdrive (or really tall gears) to reduce cruise rpm's will do the most for better fuel economy.
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Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken |
06-02-2010, 12:20 AM | #17 |
I really hate wet sanding!
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Location: Brookfield, MO
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Re: 383 Guys, I Need Some Input.
I would say buy them all, sale the extras and have yours for free plus some coin in your pocket....I would be very skeptical, it truly sounds too good to be true. Like someone pointed out, the tunnel ram and the 2 950 carbs are worth way more than what he is asking for the complete 700+ hp engine. With those carbs you will be lucky to see anything close to 10 mpg, maybe get 5 mpg if you are lucky. Unless you are plaining on turning your daily driven 3/4 ton into a drag truck, I would say stick with the motor you got.
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Jeff, 68 C-10 75 C-20, now a C-10! 10 F-150 |
06-02-2010, 04:46 AM | #18 |
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Re: 383 Guys, I Need Some Input.
Everyone is being so negative, I think that sounds like a hell of a deal. And even if it's not 750 HP you can't pass that up. Go for it man
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06-02-2010, 09:31 AM | #19 |
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Re: 383 Guys, I Need Some Input.
They are not being negative.. They are just telling someone to watch out and make sure they are not getting in over there head... Or screwed..
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06-02-2010, 10:10 AM | #20 | |
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Re: 383 Guys, I Need Some Input.
Quote:
Personally, I don't see a naturally aspirated, non nitrous or any of that other bs, 383 making 725hp just because of a tunnel ram and a pair of Holley's plus a cam that has no real specs given. If you're confident with the guys good nature, spend the $700 and give us the result.
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'69 Dodge Charger R/T 440, 727, 3.55 Sure Grip '68 Plymouth Road Runner 383, 727, 3.23 Sure Grip '89 Dodge Diplomat ex cop car 408, 727, 3.55 Sure Grip '77 Dodge Monaco ex cop car 440, 727, 2.71 '79 Dodge 'Lil Red Express pickup 360, 727, 3.55 Sure Grip '12 Dodge Challenger SRT8 392, M6, 3.92 '85 Chevrolet C-10 SWB 2wd 305, TH350, 2.73 Last edited by 85Bowtie; 06-02-2010 at 10:10 AM. |
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06-02-2010, 12:42 PM | #21 |
Truck and auto performance nut
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Re: 383 Guys, I Need Some Input.
....comes from years and years of experience...with those that don't carry the same morals as most of us do.
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Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken |
06-02-2010, 03:28 PM | #22 |
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Re: 383 Guys, I Need Some Input.
Very true, I stand corrected
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73 Chevy k10 In progress http://67-72chevytrucks.com/vboard/s...52#post3552552 2000 Trans Am, ls1, 6 Spd http://ls1tech.com/forums/appearance...years-old.html |
06-02-2010, 06:37 PM | #23 |
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Re: 383 Guys, I Need Some Input.
Well i have a 383 in my 4wd with 35s and 307 gears i get about 10 on the city and about 15 on the free way i have about 400 hp
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06-02-2010, 07:25 PM | #24 |
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Re: 383 Guys, I Need Some Input.
Sounds more like dirt track claimer motors to me, and for $700 that is OK, but I would make sure that the compression ratio will allow for pump gas. At the very least you will want a cam swap since an all out race cam will be meant for a sustained 4000+ RPM.
Either way, I would go over any motor with a fine toothed comb before spending more than the value of a rebuildable core for it.
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06-02-2010, 08:44 PM | #25 |
I know the pieces fit
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Re: 383 Guys, I Need Some Input.
I've got major issues with this man and his claims about this engine. I've already mentioned the tunnel ram and dual 950 Holley's being worth more than the asking price. Since the thread is still alive I have to bring up the heads.
He is flat out crazy or is trying to rip you off. I'll have to make a few more logical assumptions first. If this engine had good aluminum heads, they'd cost another grand alone (on top of the dual 950 Holley's on a tunnel ram) so the math once again doesn't add up. (This critique can go on and on...) So I'm assuming that since you said the heads were ported and polished they are factory iron heads. I know for a fact that factory iron heads will support 750 hp on the dyno. I know someone personally who builds these heads and I've seen the dyno runs to back it up. But he's older now and only makes them for himself and a very few close friends. He charges $30,000 a pair. The runners are filled and ground and filled and ground until the intake runners are a straight shot to the cylinders but they still cc the same as stock heads - a NHRA requirement. He races all the NHRA meets, and has three cars. He races stock and super stock. Super stock is the only class that allows these highly modified heads. Google Bob Dennis NHRA, Bob Dennis stocker, Bob Dennis super stock. So, yeah. Iron heads can make 750 hp on the dyno. There's no chance in hell this seller is telling you the truth, and I really do hope you don't buy from him and quit talking to him. |
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