12 valve swap! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70c10guy · 02-13-2016, 07:41 PM

Hi all, going to try to go for a 12 valve swap within a year. I've gone to the diesel conversion section and looked through a bunch of threads and there was a specific one that was I believe a c30 and he used auto world mounts. The mounts look pretty straight forward but I just couldn't see what he did for the perches. Are they the stock ones? Built? Bought? Someone clear this up!! Thanks a bunch.

MaxPF · 02-15-2016, 01:26 AM

Are you wanting to put a 12V in a ½ ton? If so, it is a bad idea unless you box and reinforce the frame.

**kwmech** · 02-15-2016, 01:39 AM

A cummins 12v swap in the 67-72 is a really tight squeeze requiring either firewall rebuilding or stretching the front out. PLUS frame work. If I remember right the engine pushes 1200lbs with coolers and everything

**special-K** · 02-15-2016, 10:29 AM

If we knew what thread you are talking about we might be able to answer your question. We need to see what you saw. It would help to now what truck you have and what engine it came with

**Dieselwrencher** · 02-15-2016, 09:39 PM

Quote:

Originally Posted by 70c10guy

Hi all, going to try to go for a 12 valve swap within a year. I've gone to the diesel conversion section and looked through a bunch of threads and there was a specific one that was I believe a c30 and he used auto world mounts. The mounts look pretty straight forward but I just couldn't see what he did for the perches. Are they the stock ones? Built? Bought? Someone clear this up!! Thanks a bunch.

Do you have a picture of this truck? You are correct that Auto World has a mount kit that will work for your truck. If he used auto world mounts, he used their perches. They don't use anything OEM except a modified version of a 1st gen dodge cummins engine mount. It's poly and not rubber.

MaxPF · 02-16-2016, 04:07 AM

Quote:

Originally Posted by kwmech

A cummins 12v swap in the 67-72 is a really tight squeeze requiring either firewall rebuilding or stretching the front out. PLUS frame work.

Have you read some of the swap threads in this section? B-series Cummins fit in a 67-72 chassis just fine. No firewall rebuilding, no front stretching, and minimal frame work.

Quote:

If I remember right the engine pushes 1200lbs with coolers and everything

This 1200lbs gets tossed around repeatedly on the internet. Fortunately, I have the Cummins B series shop manual in front of me. Engine weight of a 6BTA with standard accessories is 910 to 970 lbs. The 50lb variation is dependent on the exact accessory setup and whether it has a JWAC. Automotive 6BTAA's don't use the JWAC since they are air-air aftercooled, so figure 950lbs max weight. By comparison, an all-iron big block WITHOUT accessories is 685lbs and a 6.2/6.5L diesel with accessories is about 750lbs.

**Dieselwrencher** · 02-17-2016, 09:38 PM

Max, it does vary but my manual shows 1020 dry and that's with no a/c comp, alt, vacuum pump/ps pump. The 950 is not accurate for a complete engine. I've weighed them a few times trying to shed some weight off one for a car.

http://cumminshub.com/12v.html

MaxPF · 02-18-2016, 01:48 AM

My info comes from Cummins' own B-series shop manual. It says "Engine weight (with standard accessories): 6 cylinder engines ..... 410 to 440kg [910 to 970lbs]"

Perhaps "standard accessories" only means a water pump?

70c10guy · 03-24-2016, 07:03 PM

Hi guys, sorry I haven't really been on much but his username is kobush. The install looked so clean especially the mounts. My truck is a 70 c10 original with a 307/3 on the tree. Still the 307 with some goodies and a t5 behind it.

**Dieselwrencher** · 03-24-2016, 08:39 PM

Quote:

Originally Posted by 70c10guy

Hi guys, sorry I haven't really been on much but his username is kobush. The install looked so clean especially the mounts. My truck is a 70 c10 original with a 307/3 on the tree. Still the 307 with some goodies and a t5 behind it.

That's because he used auto world mounts. Ken and Dawna are great people and provide great service!

http://www.cumminsdieselrepowers.com/

70c10guy · 03-29-2016, 10:31 PM

So is that set up mounts/perches from autoworld? Or mounts are auto world and stock perches?

**Dieselwrencher** · 03-30-2016, 12:47 AM

Quote:

Originally Posted by 70c10guy

So is that set up mounts/perches from autoworld? Or mounts are auto world and stock perches?

Auto world does not use stock upper mounts. (Perches) You will get new fabricated upper mounting brackets, and a poly engine mount. Per side.

70c10guy · 04-11-2016, 01:04 PM

Cool thanks!

02-13-2016, 07:41 PM	#1
70c10guy Registered User Join Date: Feb 2015 Location: Washingtonville ny Posts: 179	12 valve swap! Hi all, going to try to go for a 12 valve swap within a year. I've gone to the diesel conversion section and looked through a bunch of threads and there was a specific one that was I believe a c30 and he used auto world mounts. The mounts look pretty straight forward but I just couldn't see what he did for the perches. Are they the stock ones? Built? Bought? Someone clear this up!! Thanks a bunch.

02-15-2016, 01:26 AM	#2
MaxPF Registered User Join Date: Jan 2016 Location: Mesa, AZ Posts: 60	Re: 12 valve swap! Are you wanting to put a 12V in a ½ ton? If so, it is a bad idea unless you box and reinforce the frame. __________________ 1991 V1500 Blazer (Silverado), 5.9L 12V P-pumped Cummins (5x .012 sac injectors, #6 fuel plate, WH1C with external 38mm wastegate running 30psi), NV4500 with 1-⅜" input shaft, SBC Con-O clutch, NP205, HAD, 4.10 D61/14BFF spinning 37" Nitto Exo's "I got a shotgun, a rifle, and a four wheel drive and a country boy can survive."

02-15-2016, 01:39 AM	#3
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,387	Re: 12 valve swap! A cummins 12v swap in the 67-72 is a really tight squeeze requiring either firewall rebuilding or stretching the front out. PLUS frame work. If I remember right the engine pushes 1200lbs with coolers and everything

02-15-2016, 10:29 AM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,862	Re: 12 valve swap! If we knew what thread you are talking about we might be able to answer your question. We need to see what you saw. It would help to now what truck you have and what engine it came with __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

02-17-2016, 09:38 PM	#7
Dieselwrencher 6>8 Plugless........ Join Date: Sep 2007 Location: Prairie City, Ia Posts: 17,133	Re: 12 valve swap! Max, it does vary but my manual shows 1020 dry and that's with no a/c comp, alt, vacuum pump/ps pump. The 950 is not accurate for a complete engine. I've weighed them a few times trying to shed some weight off one for a car. http://cumminshub.com/12v.html __________________ Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project *Tired of spark plugs? Check this out.*

02-18-2016, 01:48 AM	#8
MaxPF Registered User Join Date: Jan 2016 Location: Mesa, AZ Posts: 60	Re: 12 valve swap! My info comes from Cummins' own B-series shop manual. It says "Engine weight (with standard accessories): 6 cylinder engines ..... 410 to 440kg [910 to 970lbs]" Perhaps "standard accessories" only means a water pump? __________________ 1991 V1500 Blazer (Silverado), 5.9L 12V P-pumped Cummins (5x .012 sac injectors, #6 fuel plate, WH1C with external 38mm wastegate running 30psi), NV4500 with 1-⅜" input shaft, SBC Con-O clutch, NP205, HAD, 4.10 D61/14BFF spinning 37" Nitto Exo's "I got a shotgun, a rifle, and a four wheel drive and a country boy can survive."

03-24-2016, 07:03 PM	#9
70c10guy Registered User Join Date: Feb 2015 Location: Washingtonville ny Posts: 179	Re: 12 valve swap! Hi guys, sorry I haven't really been on much but his username is kobush. The install looked so clean especially the mounts. My truck is a 70 c10 original with a 307/3 on the tree. Still the 307 with some goodies and a t5 behind it.

03-29-2016, 10:31 PM	#11
70c10guy Registered User Join Date: Feb 2015 Location: Washingtonville ny Posts: 179	Re: 12 valve swap! So is that set up mounts/perches from autoworld? Or mounts are auto world and stock perches?

04-11-2016, 01:04 PM	#13
70c10guy Registered User Join Date: Feb 2015 Location: Washingtonville ny Posts: 179	Re: 12 valve swap! Cool thanks!



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