Post your cruising rpms @60mph - The 1947 - Present Chevrolet & GMC Truck Message Board Network

eray92 · 08-29-2013, 09:48 PM

Post your set up,

383 small cam headers intake q-jet 3" exhaust
200-4r
3.08
29.4" tires 255/45/20

Getting roughly 16.5 mpg

Rpm@60= 1300 roughly
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bilfman · 08-29-2013, 10:27 PM

454 781 heads
Edelbrock 750 and Performer
Headers
Torque ground cam and roller rockers
4L80E
3.73
32" tires
1850@60

jitteryguy · 08-29-2013, 10:48 PM

don't have the tach hook'd up yet but it sound's like 12000 at 60 MPH, I need overdrive and a 3.73 gear bad !

TwoFiftyShifter · 08-29-2013, 10:58 PM

Stock 305 smokes and burns oil. 31 inch tires. SM465 creeper box with 3.08 gears. 2000 at 60
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INSIDIOUS '86 · 08-29-2013, 11:28 PM

26.5 tires and 3:73 gears and th350. 3000rpm at 60mph 3500 at 70mph which is where I cruise at haha. I need a nice 200r4
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Mikec10 · 08-29-2013, 11:36 PM

28" tires 3.73 gears and a nv3500, roughly like 2200-2500 rpms around 70-75

izzy_Britton · 08-30-2013, 12:42 AM

Stock 305
Edelbrock 1406
700r4
No clue rear gears
235/75/15
1750 @ 60
1950-2000 @ 72
about 22 mpg

eray92 · 08-30-2013, 04:45 AM

My 200-4r was free ha, I have an older friend and he can not stand o/d auto trannies. He is a hot rod guy and... MOPAR. Any way I'm thinking of swapping gears to raise my rpms. I think 1200-1400 is too few rpms for a first gen sbc.

Keep posting them up!
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Keith Seymore · 08-30-2013, 08:22 AM

Quote:

Originally Posted by eray92

My 200-4r was free ha, I have an older friend and he can not stand o/d auto trannies. He is a hot rod guy and... MOPAR. Any way I'm thinking of swapping gears to raise my rpms. I think 1200-1400 is too few rpms for a first gen sbc.

Keep posting them up!
Posted via Mobile Device

Tell him about the MOPAR A833 manual overdrive trans that you could get in these trucks....

http://www.customclassictrucks.com/t..._transmission/

K

TwoFiftyShifter · 08-30-2013, 08:26 AM

Quote:

Originally Posted by izzy_Britton

Stock 305
Edelbrock 1406
700r4
No clue rear gears
235/75/15
1750 @ 60
1950-2000 @ 72
about 22 mpg

3.42

TwoFiftyShifter · 08-30-2013, 08:29 AM

My father had an 87 short bed 2WD, 4 speed manual with OD. He loved it.

Ski-me · 08-30-2013, 08:53 AM

Just tested out this morning:

60 MPH
1,600 RPM's
350/700r4
4.10 gears
35" Tires

70 MPH
1,900 RPM's

*cleansquare* · 08-30-2013, 10:15 AM

60 mph
350 with vortec heads
4L80e
4.10

2000 rpm
Posted via Mobile Device

eray92 · 08-30-2013, 01:36 PM

Quote:

Originally Posted by Keith Seymore

Tell him about the MOPAR A833 manual overdrive trans that you could get in these trucks....

http://www.customclassictrucks.com/t..._transmission/

K

I didn't know that, I think he has a couple of these laying around. Right now he is building a t-bucket powered by a 283 with corvette intake with 2 4 barrels and a Saginaw 4 speed.

I have 2 sets if gears, 3.08 and 4.56. Everyone says no to 4.56 but my rpms will be at 2100 at 60 and furthest I drive the truck is like 45 miles and the speed limits are 55 around here.
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Skunksmash · 08-30-2013, 03:48 PM

At 65mph I'm only doing 1400 RPM so at 80:

87
TBI 5.7L
2.73's
700R4
.7 final drive gear
80mph@1800 RPM
17mpg Highway 14 city

I used to think something was wrong with my RPM gauge.

SilverMiner · 08-30-2013, 06:33 PM

This is a useful thread, as it caused me to notice a discrepancy in my rig:

1980 K10 Suburban
350/TH350 & NP205
32" Cooper Disco STT's
~2400 rpm @ 60mph
~2700 rpm @ 70mph

The SPID says its supposed to have 3.42 gears, but the tach doesn't lie and it sure looks like they are actually 3.73's
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Tom · 08-30-2013, 06:42 PM

My old 79 had 3.08's and a 2004-R so I was about 1500@80mph. With a stock vortec 350 with RPM intake, 600 edelbrock carb, 2" ramhorns with 2.5" exhaust I'd get 16mpg freeway when I was lucky. I never did get the carb dialed in.

My 78 has never gotten anything other then 10mpg combined, and thats with 3 different engines.

eray92 · 08-30-2013, 09:29 PM

I don't ever get on the interstate, all my driving is on a 2 lane highway and small towns. I live in a rural area woo! The 16.5 mpg is a combined amount between city and highway.
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Skunksmash · 08-31-2013, 01:21 AM

Quote:

Originally Posted by SilverMiner

~2700 rpm @ 70mph

The SPID says its supposed to have 3.42 gears, but the tach doesn't lie and it sure looks like they are actually 3.73's
Posted via Mobile Device

What's your final gear in the trans? That will tell you

dieseldawg142 · 08-31-2013, 01:49 AM

haven't had my truck up to 60 in awhile, for fuel sake i cruise at 55 & my tach hangs at 2800
'85 crew, 454 (efi), t400, 205, 4:56's, 38.5" tires

eray92 · 08-31-2013, 02:01 AM

Quote:

Originally Posted by dieseldawg142

haven't had my truck up to 60 in awhile, for fuel sake i cruise at 55 & my tach hangs at 2800
'85 crew, 454 (efi), t400, 205, 4:56's, 38.5" tires

I was just looking at your sound proofing the other day, you have a nice truck!
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Blackpony · 08-31-2013, 03:30 AM

Ls1, 4l60, 3.73 with a 29" tire I'm around 1800 ish at 60. Cruising at 75 I was averaging 19.5...
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eray92 · 08-31-2013, 04:01 AM

Quote:

Originally Posted by Blackpony

Ls1, 4l60, 3.73 with a 29" tire I'm around 1800 ish at 60. Cruising at 75 I was averaging 19.5...
Posted via Mobile Device

No need to come in here and make us feel bad! Haha
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Skunksmash · 08-31-2013, 07:23 AM

Quote:

Originally Posted by Blackpony

Ls1, 4l60, 3.73 with a 29" tire I'm around 1800 ish at 60. Cruising at 75 I was averaging 19.5...
Posted via Mobile Device

How much would you say that your conversion cost you, in the end? I'm trying to gather up data on what I should pay for my 5.3 swap next year.

Blackpony · 08-31-2013, 09:56 AM

Quote:

Originally Posted by eray92

No need to come in here and make us feel bad! Haha
Posted via Mobile Device

Hehe

Quote:

Originally Posted by Skunksmash

How much would you say that your conversion cost you, in the end? I'm trying to gather up data on what I should pay for my 5.3 swap next year.

Ehhh I probably have around 4k in it. My biggest expense though was I bought the parts little by little as I had the cash and found a deal. I completely rebuilt my engine, new pistons, rods, crank, cam, springs etc. it was a new engine when I installed it. Also I bought a fully built trans and new converter. If you go 5.3 take out and can get say an engine and trans with the accessories and wiring, you should easily come under 2k total. I was just picky and wanted the aluminum 5.7 rather then an iron block so they tend to me a bit more expensive.
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08-29-2013, 09:48 PM	#1
eray92 Registered User Join Date: Dec 2012 Location: Batesville Indiana Posts: 126	Post your cruising rpms @60mph Post your set up, 383 small cam headers intake q-jet 3" exhaust 200-4r 3.08 29.4" tires 255/45/20 Getting roughly 16.5 mpg Rpm@60= 1300 roughly Posted via Mobile Device

08-29-2013, 10:27 PM	#2
bilfman Registered User Join Date: Dec 2011 Location: Regina, SK, Canada Posts: 622	Re: Post your cruising rpms @60mph 454 781 heads Edelbrock 750 and Performer Headers Torque ground cam and roller rockers 4L80E 3.73 32" tires 1850@60 __________________ 1979 Chevy Dually Crew 4X4 454, D60 Tru-trac, D70 Detroit Locker, 3.73, 4L80E/NP205 1971 GMC 3/4 Ton 4X4

08-29-2013, 10:48 PM	#3
jitteryguy GoatLube Experss Join Date: Oct 2009 Location: clarksville, Tn. Posts: 1,337	Re: Post your cruising rpms @60mph don't have the tach hook'd up yet but it sound's like 12000 at 60 MPH, I need overdrive and a 3.73 gear bad ! __________________ *Goat Lube Express*, locations in Qalat,Afghanistan & Clarksville, Tn. '87 R30 dually 454/TH400 '85 1/2 ton CCSB '92 S10 350/350 '84 MonteCarlo 383/PG/9"ford '78 Malibu wagon 350/350 '78 Cutlass (project family car) '96 S10 Jimmy (Moma's)

08-29-2013, 10:58 PM	#4
TwoFiftyShifter Registered User Join Date: Nov 2008 Location: Gwinnett GA Posts: 1,803	Re: Post your cruising rpms @60mph Stock 305 smokes and burns oil. 31 inch tires. SM465 creeper box with 3.08 gears. 2000 at 60 Posted via Mobile Device __________________ 1982 K10 SWB 1987 V20 - Sold - Doh!

08-29-2013, 11:28 PM	#5
INSIDIOUS '86 Registered User Join Date: Jul 2009 Location: washington Posts: 4,178	Re: Post your cruising rpms @60mph 26.5 tires and 3:73 gears and th350. 3000rpm at 60mph 3500 at 70mph which is where I cruise at haha. I need a nice 200r4 Posted via Mobile Device __________________ 377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511

08-29-2013, 11:36 PM	#6
Mikec10 Registered User Join Date: Apr 2011 Location: Cleveland, Ohio Posts: 293	Re: Post your cruising rpms @60mph 28" tires 3.73 gears and a nv3500, roughly like 2200-2500 rpms around 70-75 __________________ 1980 C10 SWB Yukon 5.3/5 speed 3.73 gears.

08-30-2013, 12:42 AM	#7
izzy_Britton Registered User Join Date: Apr 2013 Location: Nor-Cal Posts: 632	Re: Post your cruising rpms @60mph Stock 305 Edelbrock 1406 700r4 No clue rear gears 235/75/15 1750 @ 60 1950-2000 @ 72 about 22 mpg __________________ WHO_DCTC - Wifes 05 Z-71 Build - Now defunct as she decided she wants an Escalade too Cream Puff - LS'd Square - Slow going on the back burner Tripple Threat - 3 Wrecks for the price of one build thread Project Delongdium - Step-Sons Plastic Clad 2003 Avalanche - DONE and Delivered.

08-30-2013, 04:45 AM	#8
eray92 Registered User Join Date: Dec 2012 Location: Batesville Indiana Posts: 126	Re: Post your cruising rpms @60mph My 200-4r was free ha, I have an older friend and he can not stand o/d auto trannies. He is a hot rod guy and... MOPAR. Any way I'm thinking of swapping gears to raise my rpms. I think 1200-1400 is too few rpms for a first gen sbc. Keep posting them up! Posted via Mobile Device

08-30-2013, 08:29 AM	#11
TwoFiftyShifter Registered User Join Date: Nov 2008 Location: Gwinnett GA Posts: 1,803	Re: Post your cruising rpms @60mph My father had an 87 short bed 2WD, 4 speed manual with OD. He loved it. __________________ 1982 K10 SWB 1987 V20 - Sold - Doh!

08-30-2013, 08:53 AM	#12
Ski-me Registered User Join Date: May 2012 Location: Colo Springs, CO Posts: 870	Re: Post your cruising rpms @60mph Just tested out this morning: 60 MPH 1,600 RPM's 350/700r4 4.10 gears 35" Tires 70 MPH 1,900 RPM's __________________ - Jeff 89' K5 Blazer, 2.5" lift, 35" tires 04' GMC Yukon XL, 3/4 ton, 8.1L

08-30-2013, 10:15 AM	#13
cleansquare Account Suspended Join Date: Mar 2013 Location: lumberton tx Posts: 575	Re: Post your cruising rpms @60mph 60 mph 350 with vortec heads 4L80e 4.10 2000 rpm Posted via Mobile Device

08-30-2013, 03:48 PM	#15
Skunksmash Registered User Join Date: Sep 2012 Location: TX Posts: 1,014	Re: Post your cruising rpms @60mph At 65mph I'm only doing 1400 RPM so at 80: 87 TBI 5.7L 2.73's 700R4 .7 final drive gear 80mph@1800 RPM 17mpg Highway 14 city I used to think something was wrong with my RPM gauge. Last edited by Skunksmash; 08-30-2013 at 03:53 PM.

08-30-2013, 06:33 PM	#16
SilverMiner Registered User Join Date: Oct 2005 Location: North Idaho Posts: 335	Re: Post your cruising rpms @60mph This is a useful thread, as it caused me to notice a discrepancy in my rig: 1980 K10 Suburban 350/TH350 & NP205 32" Cooper Disco STT's ~2400 rpm @ 60mph ~2700 rpm @ 70mph The SPID says its supposed to have 3.42 gears, but the tach doesn't lie and it sure looks like they are actually 3.73's Posted via Mobile Device __________________ 1980 K10 Suburban Silverado, original 350 w/Qjet swapped to 406sb, TH350C swapped to TH400/205

08-30-2013, 06:42 PM	#17
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,713	Re: Post your cruising rpms @60mph My old 79 had 3.08's and a 2004-R so I was about 1500@80mph. With a stock vortec 350 with RPM intake, 600 edelbrock carb, 2" ramhorns with 2.5" exhaust I'd get 16mpg freeway when I was lucky. I never did get the carb dialed in. My 78 has never gotten anything other then 10mpg combined, and thats with 3 different engines. __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

08-30-2013, 09:29 PM	#18
eray92 Registered User Join Date: Dec 2012 Location: Batesville Indiana Posts: 126	Re: Post your cruising rpms @60mph I don't ever get on the interstate, all my driving is on a 2 lane highway and small towns. I live in a rural area woo! The 16.5 mpg is a combined amount between city and highway. Posted via Mobile Device



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08-31-2013, 01:49 AM	#20
dieseldawg142 Registered User Join Date: Jul 2011 Location: back 40, bc Posts: 3,809	Re: Post your cruising rpms @60mph haven't had my truck up to 60 in awhile, for fuel sake i cruise at 55 & my tach hangs at 2800 '85 crew, 454 (efi), t400, 205, 4:56's, 38.5" tires

08-31-2013, 03:30 AM	#22
Blackpony Registered User Join Date: Feb 2013 Location: Aubrey, TX Posts: 308	Re: Post your cruising rpms @60mph Ls1, 4l60, 3.73 with a 29" tire I'm around 1800 ish at 60. Cruising at 75 I was averaging 19.5... Posted via Mobile Device

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