V8 in 6 cylinder position??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mas09ts · 02-05-2009, 12:55 PM

Is it ok to leave a v8 in the six cylinder position???

Any info appreciated. . .

68gmsee · 02-05-2009, 01:06 PM

I used mine like that for many years because I wasn't comfortable with how close the distributor was to the firewall. The only thing I noticed was a slight weight shift towards the front. Also, my drive shaft yoke was engaging the 350 transmission by only 1-1/2 inches.

On my next rebuild I'm thinking of moving the mounts back about 1 to 1-1/2 inch and redrilling the bolt holes. That will still give me plenty of clearance on dis and shift the weight more to the back.

mas09ts · 02-05-2009, 01:19 PM

Well, mine is closer to the firewall see the pics below

Is it alright sitting like this??? I believe so what do you guys think??

**special-K** · 02-05-2009, 01:23 PM

You mean when the V8 is mounted back in the 6cyl position?Where the transmission is in the position for a 6cyl,right?.Yes,it`s ok.I don`t,I always set a V8 forward so it`s not all stuffed back into the firewall and sits the way the factory did.

mas09ts · 02-05-2009, 01:38 PM

But I shouldn't have any problems with it like this should I?

TDs6t9 · 02-05-2009, 01:44 PM

The only thing I have noticed is in that position with a single core radiator is the truck seems to run a little warmer, if you don't have a fan shroud. Everything else on mine has been great.

caminokid · 02-05-2009, 02:14 PM

So let me get this right...Its ok for the 8 to sit in the 6 position? I am getting ready to this swap. I have everything to do it...but dont want to rip everything apart.

mas09ts · 02-05-2009, 02:24 PM

So I probably need to get a fan shroud, I'll track one down.

**MikeN** · 02-05-2009, 03:00 PM

I've done the 230-I6 to 350-V8 swap on my 64 C10. My truck is a 3-speed manual, and I left both the engine mounts and the bellhousing side mounts in the original, I6 location. Works like a charm. Distributor is a little tight to the firewall, but no big deal.

**too much stuff** · 02-05-2009, 03:07 PM

You shouldn't have any problems other than being snug with the dist. I used a 4x4 fan shroud which fit nicely and ran fairly cool...

**special-K** · 02-05-2009, 04:17 PM

Yeah,1/2 the swaps are done that way.

Longhorn Man · 02-05-2009, 05:20 PM

that's where the small block goes on a 4X4... you'll be fine.

bobbo · 02-05-2009, 05:24 PM

My 283 is mounted in the 6 cyl position. A bit close on the dizzy but there is enough clearance. I have driven mine like this to TN, CO, Kansas City, and hundreds of miles in between with no problems. I installed an electric cooling fan so I don't have any issues with the shroud/fan. I also have the HEI dizzy which is a bit larger than the points or other ones. Have about 1/4" between the firewall and the cap. As long as your motor mounts are good, you shouldn't have any problems.

68gmsee · 02-05-2009, 05:42 PM

[QUOTE=68gmsee;3126708]I used mine like that for many years (and then moved it forward) because I wasn't comfortable with how close the distributor was to the firewall. The only thing I noticed was a slight weight shift towards the front....
QUOTE]

Sorry left words out. That's what happends when you get old and get distracted...

I mentioned the weight shift and drive shaft problem in case you decide to move it forward to give you more clearance. I had the original 6 cylinder front springs and someone mentioned to me that there was a difference between those and the V8 springs when they came out.

caminokid · 02-05-2009, 05:47 PM

Now i wonder if my headers are going to fit...and if my exhaust is going to fit off my old 69? I can put electric fans in.

Blue71LWB · 02-05-2009, 06:14 PM

Quote:

Originally Posted by Longhorn Man

that's where the small block goes on a 4X4... you'll be fine.

Makes sense why the 4x4 shroud works better.(I learn something on here every day)

bigsnookmaster · 02-05-2009, 07:16 PM

It works better in the six cyl. position if you're racing. Better weight transfer.

1969K10 · 02-05-2009, 07:45 PM

Quote:

Originally Posted by caminokid

Now i wonder if my headers are going to fit...and if my exhaust is going to fit off my old 69? I can put electric fans in.

I ran headers on my V8 in the I6 position. Had to run the Z-bar for the clutch thru the header, between 5 & 7. Ran like that for nearly 100K until some lady felt like shortening my '72 by pulling out in front of me...

mas09ts · 02-05-2009, 07:49 PM

Well thanks guys, I didnt think about moving the mounts when I done the v8 swap. I thought you could do it this way though. But thanks for everyting, I just wasnt sure if it would be alright.

john02fxdl · 02-05-2009, 08:53 PM

OK, since we're on the topic, I am also doing a I6 to V8 conversion and a 3spd manual to TH350 swap. Already took out mid-mount crossmember. I thought someone said on here to swap the I6 perches(left to right, right to left) and put them in the front holes. I tried that, doesn't line up. Do I have to bend the bottom of the perch to get it to line up with the holes on the crossmember? Since I'm doing a complete swap, I want the 350 in the front holes and I'll install the tranny crossmember where it lines up with the trans. Or just search the boneyard for V8 mounts already in front holes, that way I know I'll get the right ones. Sorry to bust in on your dilemma, just that I had a similar question and no sense posting a new thread for the same topic.

mas09ts · 02-05-2009, 09:02 PM

Hey thats alright john02fxdl, maybe this thread can help alot of people. My question has done been answered.

02-05-2009, 12:55 PM	#1
mas09ts Registered User Join Date: Jul 2008 Location: Gate City VA Posts: 576	V8 in 6 cylinder position??? Is it ok to leave a v8 in the six cylinder position??? Any info appreciated. . . __________________ Mitch 22yrs. Young 1970 GMC Short-Step 350/TH350 Combo. . . . Sold Dec 2011 Current Project 68 Gmc "Second Chance" Go to my 68 GMC Shorty Rebuild Thread http://67-72chevytrucks.com/vboard/s...39#post6341739 Last edited by mas09ts; 02-05-2009 at 12:55 PM.

02-05-2009, 01:06 PM	#2
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: V8 in 6 cylinder position??? I used mine like that for many years because I wasn't comfortable with how close the distributor was to the firewall. The only thing I noticed was a slight weight shift towards the front. Also, my drive shaft yoke was engaging the 350 transmission by only 1-1/2 inches. On my next rebuild I'm thinking of moving the mounts back about 1 to 1-1/2 inch and redrilling the bolt holes. That will still give me plenty of clearance on dis and shift the weight more to the back.

02-05-2009, 01:19 PM	#3
mas09ts Registered User Join Date: Jul 2008 Location: Gate City VA Posts: 576	Re: V8 in 6 cylinder position??? Well, mine is closer to the firewall see the pics below Is it alright sitting like this??? I believe so what do you guys think?? __________________ Mitch 22yrs. Young 1970 GMC Short-Step 350/TH350 Combo. . . . Sold Dec 2011 Current Project 68 Gmc "Second Chance" Go to my 68 GMC Shorty Rebuild Thread http://67-72chevytrucks.com/vboard/s...39#post6341739

02-05-2009, 01:23 PM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,862	Re: V8 in 6 cylinder position??? You mean when the V8 is mounted back in the 6cyl position?Where the transmission is in the position for a 6cyl,right?.Yes,it`s ok.I don`t,I always set a V8 forward so it`s not all stuffed back into the firewall and sits the way the factory did. __________________ "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 ~

02-05-2009, 01:38 PM	#5
mas09ts Registered User Join Date: Jul 2008 Location: Gate City VA Posts: 576	Re: V8 in 6 cylinder position??? But I shouldn't have any problems with it like this should I? __________________ Mitch 22yrs. Young 1970 GMC Short-Step 350/TH350 Combo. . . . Sold Dec 2011 Current Project 68 Gmc "Second Chance" Go to my 68 GMC Shorty Rebuild Thread http://67-72chevytrucks.com/vboard/s...39#post6341739

02-05-2009, 01:44 PM	#6
TDs6t9 Registered User Join Date: Apr 2005 Location: Portsmouth, VA Posts: 59	Re: V8 in 6 cylinder position??? The only thing I have noticed is in that position with a single core radiator is the truck seems to run a little warmer, if you don't have a fan shroud. Everything else on mine has been great.

02-05-2009, 02:14 PM	#7
caminokid Chevy nut Join Date: Jun 2007 Location: Springfield, Illinois Posts: 2,265	Re: V8 in 6 cylinder position??? So let me get this right...Its ok for the 8 to sit in the 6 position? I am getting ready to this swap. I have everything to do it...but dont want to rip everything apart. __________________ 84 Chevy Custom Deluxe 1/2 Ton Named Fade To Black II "Remember kids there is NO replacement for displacement!"

02-05-2009, 02:24 PM	#8
mas09ts Registered User Join Date: Jul 2008 Location: Gate City VA Posts: 576	Re: V8 in 6 cylinder position??? So I probably need to get a fan shroud, I'll track one down. __________________ Mitch 22yrs. Young 1970 GMC Short-Step 350/TH350 Combo. . . . Sold Dec 2011 Current Project 68 Gmc "Second Chance" Go to my 68 GMC Shorty Rebuild Thread http://67-72chevytrucks.com/vboard/s...39#post6341739

02-05-2009, 03:00 PM	#9
MikeN Senior Member Join Date: Oct 2007 Location: Marietta, GA Posts: 776	Re: V8 in 6 cylinder position??? I've done the 230-I6 to 350-V8 swap on my 64 C10. My truck is a 3-speed manual, and I left both the engine mounts and the bellhousing side mounts in the original, I6 location. Works like a charm. Distributor is a little tight to the firewall, but no big deal.

02-05-2009, 03:07 PM	#10
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,691	Re: V8 in 6 cylinder position??? You shouldn't have any problems other than being snug with the dist. I used a 4x4 fan shroud which fit nicely and ran fairly cool... __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

02-05-2009, 04:17 PM	#11
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,862	Re: V8 in 6 cylinder position??? Yeah,1/2 the swaps are done that way. __________________ "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 ~

02-05-2009, 05:20 PM	#12
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: V8 in 6 cylinder position??? that's where the small block goes on a 4X4... you'll be fine.

02-05-2009, 05:24 PM	#13
bobbo Droppin' It Like It's Hot! Join Date: Jun 2007 Location: Battlefield, Missouri Posts: 2,934	Re: V8 in 6 cylinder position??? My 283 is mounted in the 6 cyl position. A bit close on the dizzy but there is enough clearance. I have driven mine like this to TN, CO, Kansas City, and hundreds of miles in between with no problems. I installed an electric cooling fan so I don't have any issues with the shroud/fan. I also have the HEI dizzy which is a bit larger than the points or other ones. Have about 1/4" between the firewall and the cap. As long as your motor mounts are good, you shouldn't have any problems. __________________ Robert Life Member RIP CAROL JANICE HARTMAN. BELOVED MOTHER. 01/04/53 - 03/05/09 1969 1500 Norwood, MO 2007 Big Sandy, TN 2008 Had nothing to do with the forklift! Kirkwood, MO (Midwest Meet 2009) Midwest All Truck Nationals, KCMO - 2008 - 2009 - 2010 - 2012 - 2014 SUPPORT THE SITE HERE! Last edited by bobbo; 02-05-2009 at 05:26 PM.

02-05-2009, 05:42 PM	#14
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: V8 in 6 cylinder position??? [QUOTE=68gmsee;3126708]I used mine like that for many years (and then moved it forward) because I wasn't comfortable with how close the distributor was to the firewall. The only thing I noticed was a slight weight shift towards the front.... QUOTE] Sorry left words out. That's what happends when you get old and get distracted... I mentioned the weight shift and drive shaft problem in case you decide to move it forward to give you more clearance. I had the original 6 cylinder front springs and someone mentioned to me that there was a difference between those and the V8 springs when they came out. Last edited by 68gmsee; 02-05-2009 at 05:42 PM.

02-05-2009, 05:47 PM	#15
caminokid Chevy nut Join Date: Jun 2007 Location: Springfield, Illinois Posts: 2,265	Re: V8 in 6 cylinder position??? Now i wonder if my headers are going to fit...and if my exhaust is going to fit off my old 69? I can put electric fans in. __________________ 84 Chevy Custom Deluxe 1/2 Ton Named Fade To Black II "Remember kids there is NO replacement for displacement!"



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02-05-2009, 07:16 PM	#17
bigsnookmaster Registered User Join Date: Jan 2008 Location: St.Petersburg,Fl Posts: 1,267	Re: V8 in 6 cylinder position??? It works better in the six cyl. position if you're racing. Better weight transfer. __________________ greg http://community.webshots.com/user/68406Stepside

02-05-2009, 07:49 PM	#19
mas09ts Registered User Join Date: Jul 2008 Location: Gate City VA Posts: 576	Re: V8 in 6 cylinder position??? Well thanks guys, I didnt think about moving the mounts when I done the v8 swap. I thought you could do it this way though. But thanks for everyting, I just wasnt sure if it would be alright. __________________ Mitch 22yrs. Young 1970 GMC Short-Step 350/TH350 Combo. . . . Sold Dec 2011 Current Project 68 Gmc "Second Chance" Go to my 68 GMC Shorty Rebuild Thread http://67-72chevytrucks.com/vboard/s...39#post6341739

02-05-2009, 08:53 PM	#20
john02fxdl Registered User Join Date: Oct 2008 Location: Avondale, PA. South east corner of the state Posts: 75	Re: V8 in 6 cylinder position??? OK, since we're on the topic, I am also doing a I6 to V8 conversion and a 3spd manual to TH350 swap. Already took out mid-mount crossmember. I thought someone said on here to swap the I6 perches(left to right, right to left) and put them in the front holes. I tried that, doesn't line up. Do I have to bend the bottom of the perch to get it to line up with the holes on the crossmember? Since I'm doing a complete swap, I want the 350 in the front holes and I'll install the tranny crossmember where it lines up with the trans. Or just search the boneyard for V8 mounts already in front holes, that way I know I'll get the right ones. Sorry to bust in on your dilemma, just that I had a similar question and no sense posting a new thread for the same topic.

02-05-2009, 09:02 PM	#21
mas09ts Registered User Join Date: Jul 2008 Location: Gate City VA Posts: 576	Re: V8 in 6 cylinder position??? Hey thats alright john02fxdl, maybe this thread can help alot of people. My question has done been answered. __________________ Mitch 22yrs. Young 1970 GMC Short-Step 350/TH350 Combo. . . . Sold Dec 2011 Current Project 68 Gmc "Second Chance" Go to my 68 GMC Shorty Rebuild Thread http://67-72chevytrucks.com/vboard/s...39#post6341739

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