What is needed to installv-8 in I-6 loc? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevy2racr · 04-08-2003, 09:23 PM

do I need I-6 stands or my v-8 stands work?drill holes? what?

**passthebuck** · 04-08-2003, 09:26 PM

good question - I'll EVENTUALLY be making the same swap in my '67 GMC.

oldsub86 · 04-08-2003, 09:28 PM

What do you mean "stands"? Are we taling motor mounts?

Blackhawkdc · 04-08-2003, 09:32 PM

So, if I read you right, you've got a V8 in it right now, but wanna move it back to the I6 position. Your stands and everything stay the same, you'll just need to move them back to the I6 set of holes in the frame, they should already be drilled there. AS far as the tranny cross member, it will need to be moved back. But as for that, I'm at a loss.

chevy2racr · 04-08-2003, 09:54 PM

it looks to me that I have no lower holes for it. anyone have a pic of the lower motor tower holes??

Blackhawkdc · 04-08-2003, 10:13 PM

For the lower holes, you'll probably have to set the stands and engine down inthere, get everything lined up straight, then mark the holes, pull the engine, drill and install.

gmc67swb · 04-08-2003, 10:16 PM

hey chevy2racer, mine was originally an i-6. I now have a v-8. at the time i knew nothing of 2 different mounting locations. when i look at mine i can only see on hole in front my existing mount. so either there is only 3 holes and they share the center or one of the two holes for the v-8 location is completely covered by the mount.

crazy longhorn · 04-08-2003, 11:04 PM

the 6 & v8 stands are different. On the top of the frame, the 6 stands bolt to the rear 2 holes(v8 stands to the front 2 holes). You will find exactly 2 1/2 " cent to cent on the top bolt holes on the frame.......however, due to the shape of the stands, i 6 position gives 3 1/2" of set back from sb v8 position. At the bottom, the 6 stands bolt to the rear of the crossmember(you will see the boltholes, in a slightly recessed area). i have done 3 of them this way......trust me , you dont have to drill anything if you use the 6 /250 stands. If you are running a stick, toss the bell crossmember, & use an auto crossmember under the trans......the bell crossmembers are also different 3 times.....BB stick, sb stick, & I 6 stick. they all position differently, & are on a slope on the rails, so they cant be moved to use in a different position. Sorry, no pics of the bottom at this time, but the 383 is in i 6 position, with a 6 spd Richmond behind it( on a modified auto crossmember). good luck, crazyL

Slammed67 · 04-08-2003, 11:54 PM

I agree with Crazy.

chevy2racr · 04-09-2003, 08:29 AM

so Jay and Crazy, you both used I-6 stands? will my v-8 stands set then engine lower in the frame than a standard I-6 stand with a v-8? thanks
Bryce

crazy longhorn · 04-09-2003, 08:42 AM

I couldnt find a measurable difference on nose height with either position. If I had to give a number, i would say the v8 sits approx 1/4" lower in I 6 position( with I 6 stands & crossmember) than it does in factory V8 position. I used a 73 up long waterpump, & didnt have any issues with centering the fan in the stock sb shroud. crazyL

dubie · 04-09-2003, 10:30 AM

Here is a pic of the different mounting holes

**1971Stepside** · 04-09-2003, 12:37 PM

of I-6 stands mounted on my frame (swapping them out for BB stands). You can see that they use the back hole in the cross member and are shaped differently than the v-8 stands. They will use the same motor mount though.

crazy longhorn · 04-09-2003, 02:37 PM

Stepside, that frame is too pretty to cover up!

crazyL

dubie · 04-09-2003, 02:53 PM

I agree, that is the SWEETEST rolling chassis I have ever seen!!!

**1971Stepside** · 04-09-2003, 03:49 PM

LOL, thanks guys. Maybe instead of new patch panels in the floor I could go with plexiglass!!

*Shane* · 04-09-2003, 04:32 PM

I also agree with Crazy Longhorn .... i have both types of stands (I-6 & V-8) and plan on putting my V-8 back in the I-6 position to move the engine towards the cab. They are NOT the same peices ...

72MARIO · 04-09-2003, 05:07 PM

How close is the HEI to the firewall ?
Does it still come out easily. any other down sides ?

Thanks.

crazy longhorn · 04-09-2003, 05:38 PM

The HEI fits, with about 1 finger clearance tween the firewall & the cap(pretty snug). It will go in/out of the eng with the cap & rotor off. it hasnt been a problem, but when I upgrade Im going small cap MSD.........crazyL

one upside, the oil pan will come off with the eng mounts in place

adamls · 04-09-2003, 06:39 PM

You could always go with a crank trigger instead of the HEI

*Shane* · 04-09-2003, 08:30 PM

i dunno on the HEI ... i am running a Mallory Unilite.

gmc67swb · 04-09-2003, 09:14 PM

here chevy2racer. this is mine with the 6 stands. finger points to the front v-8 hole

chevy2racr · 04-09-2003, 11:22 PM

I know the holes on the top, I've known those for quite some time, its the lower hole on a v-8 stand. it doesn't line with any predrilled holes. thats where a i-6 stand would line up with a lower hole as well I assume. Jay, if you can get me a pic of how you shortend yours(where I can see the cut part) it may help man
Bryce

chevy2racr · 04-09-2003, 11:25 PM

71step- I just noticed something too, anyreason you didn't remove the z-bar mount beofre you had that beast powder coated?

**1971Stepside** · 04-10-2003, 09:45 AM

At the time I wasn't sure what I wanted to do there so I left it. I kinda wish I would have removed it now, but once we are put back together you won't see it. The 502 will hopefully distract your attention from that!!

04-08-2003, 09:23 PM	#1
chevy2racr So Many Ideas, So Little Money Join Date: Sep 2001 Location: Marshalltown, IA Posts: 1,610	What is needed to installv-8 in I-6 loc? do I need I-6 stands or my v-8 stands work?drill holes? what? __________________ 72 Blazer 3/4 ton running gear 4.10s NP205/TH350 350 4in lift half doors 71 C10 with 454 99 S-10 5.1L SBC 700R4 09 Malibu Marshalltown, Iowa

04-08-2003, 09:26 PM	#2
passthebuck Sisyphus was my mentor! Join Date: Sep 2002 Location: Carleton Place, Ontario CANADA Posts: 984	good question - I'll EVENTUALLY be making the same swap in my '67 GMC. __________________ passthebuck #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car

04-08-2003, 09:28 PM	#3
oldsub86 Registered User Join Date: Dec 2002 Location: Canada Posts: 695	What do you mean "stands"? Are we taling motor mounts? __________________ 1968 Chevy - 292 with a powerglide

04-08-2003, 09:32 PM	#4
Blackhawkdc 440 american Horses Join Date: Mar 2001 Location: Anoka, MN USA Posts: 470	So, if I read you right, you've got a V8 in it right now, but wanna move it back to the I6 position. Your stands and everything stay the same, you'll just need to move them back to the I6 set of holes in the frame, they should already be drilled there. AS far as the tranny cross member, it will need to be moved back. But as for that, I'm at a loss. __________________ Seth Petro 1969 Chev Short Step 425hp 350, TH400, big tires, fast truck 1979 Pontiac Trans Am 1991 Saturn SL1 - gas mileage! (and free) 1977 Buick LeSabre - for sale May America bless God, and may God bless America

04-08-2003, 09:54 PM	#5
chevy2racr So Many Ideas, So Little Money Join Date: Sep 2001 Location: Marshalltown, IA Posts: 1,610	it looks to me that I have no lower holes for it. anyone have a pic of the lower motor tower holes?? __________________ 72 Blazer 3/4 ton running gear 4.10s NP205/TH350 350 4in lift half doors 71 C10 with 454 99 S-10 5.1L SBC 700R4 09 Malibu Marshalltown, Iowa

04-08-2003, 10:13 PM	#6
Blackhawkdc 440 american Horses Join Date: Mar 2001 Location: Anoka, MN USA Posts: 470	For the lower holes, you'll probably have to set the stands and engine down inthere, get everything lined up straight, then mark the holes, pull the engine, drill and install. __________________ Seth Petro 1969 Chev Short Step 425hp 350, TH400, big tires, fast truck 1979 Pontiac Trans Am 1991 Saturn SL1 - gas mileage! (and free) 1977 Buick LeSabre - for sale May America bless God, and may God bless America

04-08-2003, 10:16 PM	#7
gmc67swb Registered User Join Date: Feb 2003 Location: Mesquite, Tx Posts: 396	hey chevy2racer, mine was originally an i-6. I now have a v-8. at the time i knew nothing of 2 different mounting locations. when i look at mine i can only see on hole in front my existing mount. so either there is only 3 holes and they share the center or one of the two holes for the v-8 location is completely covered by the mount. __________________ GM 330HP/350, Magnuson 122HH, Tremec TKO 5spd

04-08-2003, 11:04 PM	#8
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	the 6 & v8 stands are different. On the top of the frame, the 6 stands bolt to the rear 2 holes(v8 stands to the front 2 holes). You will find exactly 2 1/2 " cent to cent on the top bolt holes on the frame.......however, due to the shape of the stands, i 6 position gives 3 1/2" of set back from sb v8 position. At the bottom, the 6 stands bolt to the rear of the crossmember(you will see the boltholes, in a slightly recessed area). i have done 3 of them this way......trust me , you dont have to drill anything if you use the 6 /250 stands. If you are running a stick, toss the bell crossmember, & use an auto crossmember under the trans......the bell crossmembers are also different 3 times.....BB stick, sb stick, & I 6 stick. they all position differently, & are on a slope on the rails, so they cant be moved to use in a different position. Sorry, no pics of the bottom at this time, but the 383 is in i 6 position, with a 6 spd Richmond behind it( on a modified auto crossmember). good luck, crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

04-08-2003, 11:54 PM	#9
Slammed67 Progress = 0% Join Date: Nov 2001 Location: Kansas City, MO Posts: 2,108	I agree with Crazy. __________________ Jason - '67 GMC swb \| '57 Bel-Air 4dr hardtop \| '56 210 4dr Wagon \| 2000 GMC Sierra

04-09-2003, 08:29 AM	#10
chevy2racr So Many Ideas, So Little Money Join Date: Sep 2001 Location: Marshalltown, IA Posts: 1,610	so Jay and Crazy, you both used I-6 stands? will my v-8 stands set then engine lower in the frame than a standard I-6 stand with a v-8? thanks Bryce __________________ 72 Blazer 3/4 ton running gear 4.10s NP205/TH350 350 4in lift half doors 71 C10 with 454 99 S-10 5.1L SBC 700R4 09 Malibu Marshalltown, Iowa

04-09-2003, 08:42 AM	#11
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	I couldnt find a measurable difference on nose height with either position. If I had to give a number, i would say the v8 sits approx 1/4" lower in I 6 position( with I 6 stands & crossmember) than it does in factory V8 position. I used a 73 up long waterpump, & didnt have any issues with centering the fan in the stock sb shroud. crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

04-09-2003, 10:30 AM	#12
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,855	Here is a pic of the different mounting holes __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795 Last edited by dubie; 04-09-2003 at 10:35 AM.

04-09-2003, 12:37 PM	#13
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	here is a pic of I-6 stands mounted on my frame (swapping them out for BB stands). You can see that they use the back hole in the cross member and are shaped differently than the v-8 stands. They will use the same motor mount though. Attached Images __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

04-09-2003, 02:37 PM	#14
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Stepside, that frame is too pretty to cover up! crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

04-09-2003, 02:53 PM	#15
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,855	I agree, that is the SWEETEST rolling chassis I have ever seen!!! __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795



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04-09-2003, 03:49 PM	#16
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	LOL, thanks guys. Maybe instead of new patch panels in the floor I could go with plexiglass!! __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

04-09-2003, 04:32 PM	#17
Shane Account Suspended Join Date: Jun 2000 Location: over yonder Posts: 14,270	I also agree with Crazy Longhorn .... i have both types of stands (I-6 & V-8) and plan on putting my V-8 back in the I-6 position to move the engine towards the cab. They are NOT the same peices ...

04-09-2003, 05:07 PM	#18
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,052	How close is the HEI to the firewall ? Does it still come out easily. any other down sides ? Thanks. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

04-09-2003, 05:38 PM	#19
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	The HEI fits, with about 1 finger clearance tween the firewall & the cap(pretty snug). It will go in/out of the eng with the cap & rotor off. it hasnt been a problem, but when I upgrade Im going small cap MSD.........crazyL one upside, the oil pan will come off with the eng mounts in place __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

04-09-2003, 06:39 PM	#20
adamls Gotta Startem Early Join Date: Oct 2001 Location: Amarillo, TX, USA Posts: 364	You could always go with a crank trigger instead of the HEI __________________ 67 SWB In Progress, one piece at a time, maybe 3 years I will be finished

04-09-2003, 08:30 PM	#21
Shane Account Suspended Join Date: Jun 2000 Location: over yonder Posts: 14,270	i dunno on the HEI ... i am running a Mallory Unilite.

04-09-2003, 09:14 PM	#22
gmc67swb Registered User Join Date: Feb 2003 Location: Mesquite, Tx Posts: 396	here chevy2racer. this is mine with the 6 stands. finger points to the front v-8 hole Attached Images __________________ GM 330HP/350, Magnuson 122HH, Tremec TKO 5spd

04-09-2003, 11:22 PM	#23
chevy2racr So Many Ideas, So Little Money Join Date: Sep 2001 Location: Marshalltown, IA Posts: 1,610	I know the holes on the top, I've known those for quite some time, its the lower hole on a v-8 stand. it doesn't line with any predrilled holes. thats where a i-6 stand would line up with a lower hole as well I assume. Jay, if you can get me a pic of how you shortend yours(where I can see the cut part) it may help man Bryce __________________ 72 Blazer 3/4 ton running gear 4.10s NP205/TH350 350 4in lift half doors 71 C10 with 454 99 S-10 5.1L SBC 700R4 09 Malibu Marshalltown, Iowa

04-09-2003, 11:25 PM	#24
chevy2racr So Many Ideas, So Little Money Join Date: Sep 2001 Location: Marshalltown, IA Posts: 1,610	71step- I just noticed something too, anyreason you didn't remove the z-bar mount beofre you had that beast powder coated? __________________ 72 Blazer 3/4 ton running gear 4.10s NP205/TH350 350 4in lift half doors 71 C10 with 454 99 S-10 5.1L SBC 700R4 09 Malibu Marshalltown, Iowa

04-10-2003, 09:45 AM	#25
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	At the time I wasn't sure what I wanted to do there so I left it. I kinda wish I would have removed it now, but once we are put back together you won't see it. The 502 will hopefully distract your attention from that!! __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

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