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#1 |
Registered User
Join Date: Mar 2013
Location: SF
Posts: 345
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Big Block vs Cummins Build
So I originally and still do want to do a cummins conversion to my 68 c10. I can find a donor truck right at around 3000, i can do most of the fab work myself. I really like the cummins motor, good mileage, great power, reliable.
Ive been thinking of the bb trucks more of late. I have strayed away from gas due to the poor gas mileage, and what seems like very high cost to have a motor built. If I were to do a mildly warmed over big block with fuel injection and a 5 spd manual, how would it stack up to the cummins? cummins would also be mildly warmed over. Things like cost, reliability, torque, street manners etc? |
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#2 |
Registered User
Join Date: Apr 2014
Location: NOR-CAL
Posts: 1,134
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Re: Big Block vs Cummins Build
Man that's a very tough comparison for sure. 3k for just an engine I imagine you will have at least half that again into a 5spd.
You going to use it as a tow rig? The gasser will be much more fun to drive for sure. No turbo lag! Heck for about the same money you can get a rebuilt 0 miles already wired 6.0 from lsx4u Big blocks have a cool factor but so do cummins. I'm sure I was lots of help |
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#3 |
Registered User
Join Date: Apr 2014
Location: NOR-CAL
Posts: 1,134
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Re: Big Block vs Cummins Build
Ok now I see whole truck but does it have the 5 speed?
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#4 | |
Registered User
Join Date: Jun 2014
Location: Glendale, Arizna
Posts: 1,642
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Re: Big Block vs Cummins Build
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#5 |
Registered User
Join Date: May 2013
Location: Central NC
Posts: 830
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Re: Big Block vs Cummins Build
I always vote for a Chevy motor in a Chevy.
Plus diesels smell funny. Just my $.02.
__________________
1972 Cheyene C-10 "Ole Green" My Grandfathers truck (early 70's to 1983) My first vehicle (1983) Original 350 (3 rebuilds) 700R4 from Bowtie Overdrives ![]() |
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#6 |
Registered User
Join Date: Apr 2014
Location: NOR-CAL
Posts: 1,134
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Re: Big Block vs Cummins Build
Now don't get me wrong I've been clammoring for small displacement diesels for a long long time. A turbocharged 4bt in a c10 with a 6sp and some high gears would make a sweet commuter
Not trying to sway your thoughts but a 6.0 LS swap would be awesome |
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#7 |
Registered User
Join Date: Oct 2012
Location: Arlington Washington
Posts: 1,808
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Re: Big Block vs Cummins Build
Gas vs diesel will never compare in my opinion. I think you nailed it on the head reliable, power, and fuel mileage vs. high cost, poor fuel mileage. I personally would never do a diesel swap unless I was wanting to build a k20 to tow with. Cummins motors are nice they just don't do it for me. Now if we were talking duramax...
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Scott 67 c10 sold 89 c1500 90 k2500 91 s10 #chevyonly ![]() |
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#8 |
Registered User
Join Date: May 2012
Location: Hickory NC
Posts: 2,351
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Re: Big Block vs Cummins Build
Cummins powered
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#9 |
Registered User
Join Date: Jan 2011
Location: Townsend MT
Posts: 1,725
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Re: Big Block vs Cummins Build
12 valve Cummins - good mileage, great power, reliable, simple, tough - what more do you want out of an engine?
400 HP with 900 ft. lbs. of torque is very easy to get and will still get just as good, if not better mileage than stock (when you're just cruising along an not using the added power of course). |
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#10 | |||
Registered User
Join Date: Mar 2013
Location: SF
Posts: 345
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Re: Big Block vs Cummins Build
Quote:
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Do you have a link to a build thread or more details? Thats pretty much exactly what I am building. Im already on PB front and will be doing the rear soon. Would love to see what they did. Quote:
I guess I should elaborate a little more on what I would use the truck for. Its not and will never be a show truck. Its my project/daily. My requirement for it is it needs to be able to drive 600+ miles in one day with 2 sport bikes in the back + gear, and a small trailer in tow. Ive had a 12v dodge in the past and loved how the motor felt. The mileage part is icing on the cake. Never been in a big block truck, but ive heard its an in between sbc and diesel. Just wondering what you guys think. |
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#11 | |
Registered User
Join Date: May 2012
Location: Hickory NC
Posts: 2,351
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Re: Big Block vs Cummins Build
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#12 |
Registered User
Join Date: Apr 2014
Location: NOR-CAL
Posts: 1,134
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Re: Big Block vs Cummins Build
I get it the ls swap might not be as sexy as a cummins but would get your power and some efficiency.
I think you've answered your own question in wanting some mileage simplicity and power if look at a diesel then. |
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#13 |
Registered User
Join Date: Mar 2013
Location: SF
Posts: 345
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Re: Big Block vs Cummins Build
Ya I think so too. Just didnt know if I was overlooking the bb option
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#14 |
Registered User
Join Date: Apr 2014
Location: NOR-CAL
Posts: 1,134
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Re: Big Block vs Cummins Build
Even at $2 a gallon single digit mpg sucks
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#15 |
Registered User
Join Date: Sep 2013
Location: S MN
Posts: 35
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Re: Big Block vs Cummins Build
Im going with a 6.2 out of a Camaro SS with the 6l80e
complete Cam kit from Mast Motorsports programmer Headers future plan supercharged or twin turbo |
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#16 |
Registered User
Join Date: Mar 2013
Location: SF
Posts: 345
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Re: Big Block vs Cummins Build
Aren't the 6.2 still considered a small block? Still based on the LS block? Your set up sounds rather expensive and not so great for hauling purposes.
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#17 | |
Registered User
Join Date: Sep 2013
Location: S MN
Posts: 35
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Re: Big Block vs Cummins Build
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#18 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Big Block vs Cummins Build
I love my bb. But I've never owned a cummins so I can really compare. I drive my bb to cruisin the coast. Get around 11 mpg and put about 700 miles on it without any issues.
Now you got me thinking of a cummins diesel swap. Lol. Keep us posted when ya build whatever you decide on.
__________________
MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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