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#1 |
Registered User
Join Date: Apr 2006
Location: Bethlehem, GA
Posts: 18
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motor mounts V-8 vs Straight six
What is the difference?
I'm guessing the point that attaches to the crossmember....since the V-8 mount sits 3" closer to the front. |
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#2 |
Senior Member
Join Date: Oct 2006
Location: Edmonton Alberta
Posts: 458
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Re: motor mounts V-8 vs Straight six
On a 73 to 87, a 250 mount is lower than the 350 mount by about an inch or so but is not further forward. Never did the swap on a 67-72 but same principle should apply.
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#3 |
Registered User
Join Date: Apr 2006
Location: oklahoma
Posts: 10,670
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Re: motor mounts V-8 vs Straight six
Stevie here we go.
The 6 cyl mounts(250) mount in the rear mounting holes and a small block will bolt right up to them so you dont have to move the tranny forward and have to have a lengthened drive shaft. But as you said the engine will be 3" back. If you have a 292 then one of the mounts will be diferent, i think it was the passenger one, and will not work with the v8 swap or a 250swap you would have to get a 250 mount for the passenger side. The 8 cyl mounts mount in the front mounting holes. They are also alot more massive than the 6 cyl ones. Plus the engine gets moved forward for more clearance and for the stock position. Hope this helps. |
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#4 |
Registered User
Join Date: Dec 2006
Location: National City Michigan
Posts: 15
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Re: motor mounts V-8 vs Straight six
never done one on a 67-72 but on a 73-87 i took out a 250 and dopped in a 350 then a big block no changes i also took a 305 out of a 88 and put a 250 in no problems
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No NO NO Sir Don't Want em Can't Use em Couldn't Afford em If I Did |
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#5 |
~Rest In Peace~
Join Date: May 2005
Location: CALIFORNIA NOR CAL
Posts: 9,707
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Re: motor mounts V-8 vs Straight six
my 70 had a 250 in it now 350 same mounts didnt have to do anything to it
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is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex |
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#6 |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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Re: motor mounts V-8 vs Straight six
My '68 had an inline six and now a 350. The mounts are in the back holes on the frame and the motor IMHO is way too far back. I can't even get the distributor out without pulling the cap off first so I won't run into the fire wall.
I know that the farther back the motor is the better weight transfer, but I'd rather have more clearance back there. |
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#7 |
Registered User
Join Date: Jan 2007
Location: massey
Posts: 74
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so what do you need to do v8 swap
do you just move the frame brackets and move or do you need v-8 frame brackets ?
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#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: motor mounts V-8 vs Straight six
assuming you have a 250, and not a 292, you can use the ones you have, but they are taller. if you move them forward, there *MAY* be issues one day with U-joints or something. Bellhousing to floor board issues may pop up too.
Correct small block ones can be had pretty cheap. |
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#9 |
Registered User
Join Date: Apr 2006
Location: MinneSNOWta
Posts: 1,381
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Re: motor mounts V-8 vs Straight six
The bottom mounting hole in the crossmember is lower in the V-8 position, so you do need the proper V-8 towers.
I noticed this over the last summer, when i replaced the motor in my truck. The PO had installed a V-8 in the I-6 position, and i figured i could just move the mounts forward. No dice. However, it is possible, but you would have to drill a new hole in the crossmember, but IMO it's just easier to pick up a set of V-8 towers.
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2003 GMC Sierra 1500 WT 1995 Nissan Hardbody 2016 Hyundai Veloster Turbo DC2 (SW/AW) Clyde W. Harvey USN "Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery" Winston Churchill |
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#10 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: motor mounts V-8 vs Straight six
thanks for the correction.
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#11 |
Its a Truck Thing......
Join Date: Dec 2004
Location: Sierra Vista, Arizona
Posts: 3,159
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Re: motor mounts V-8 vs Straight six
What trans are you running, I did the swap correctly and If you are running a 3 speed you will have to get a v8 crossmember for the trans, the 6 wont move up into the frame, at least mine didnt, I had a 1 piece shaft made and it has given me no problems. If you have an auto you shouldnt have any issues with the crossmember.
Smitty
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71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time |
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#12 |
Registered User
Join Date: Apr 2006
Location: Bethlehem, GA
Posts: 18
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Re: motor mounts V-8 vs Straight six
Found a set with a pic at manes truck parts.
I may just use the frame stands from the 76 we got the suspension from. Thanks guys. |
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