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#1 |
Straight jacket required
Join Date: Oct 2003
Location: OKC, OK
Posts: 882
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Big Block & Body Mount ???????
I just put my cab on today with new body mounts and my firewall hits the left valve cover on my 396. It clears (barely) on the other side by 1/4inch. Anyone have this problem when swapping over to a big block? Any suggestions would be appreciated.
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1968 C10 Short Stepper 350/350 A/C P/S P/B Front disc 3/5 static/ 12bolt rear 3:73 1979 Pontiac Trans Am 10th Anniversary/455/4spd 2011 H-D Street Glide - CAMMED n lowered Dad always said,"Son, if you can't be good...be good at it." ![]() |
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#2 |
The Older Generation
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Location: Montezuma, Iowa
Posts: 25,515
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Re: Big Block & Body Mount ???????
I probably can't help much but it will get your post back to the top... Did you use the big block motor mount towers that bolt to the frame? If you used the small block V-8 towers that may be your problem.... They are different.
LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#3 |
Registered User
Join Date: Feb 2004
Location: Tacoma WA
Posts: 1,365
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Re: Big Block & Body Mount ???????
My 454 has plenty of clearance using the 72style towers and mounts. We have put BBs in probably 5 or 6 trucks without any clearance problems.
What mounts and location?
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67 C-20 LWB, tilt, speed alert, vac, 454, T400 67 C-10 SWB, factory air with more to follow |
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#4 |
Truck Enthusiast
Join Date: Dec 2006
Location: Arlington, WA
Posts: 1,346
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Re: Big Block & Body Mount ???????
i've got a 454 in mine...plenty of clearance
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'85 swb |
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#5 |
Straight jacket required
Join Date: Oct 2003
Location: OKC, OK
Posts: 882
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Re: Big Block & Body Mount ???????
I used the '72 towers and forward holes. I did have to notch the frame with the towers. The body mount kit I got from Mane's didn't come with instructions, but I did realize the rubber mounts were two different sizes. I swapped them around, but to no avail. My left Morosso tall valve cover hits the firewall just barely. You think I should raise the tranny some? I'll try to take some pics tonight or tomorrow, and get a better view of this. It irritates me to see it hit. It's probably something simple, but I am having brain farts. Thanks everyone.
__________________
1968 C10 Short Stepper 350/350 A/C P/S P/B Front disc 3/5 static/ 12bolt rear 3:73 1979 Pontiac Trans Am 10th Anniversary/455/4spd 2011 H-D Street Glide - CAMMED n lowered Dad always said,"Son, if you can't be good...be good at it." ![]() |
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#6 |
The Older Generation
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Location: Montezuma, Iowa
Posts: 25,515
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Re: Big Block & Body Mount ???????
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You don't say whether they were big block or small block towers. If they were '72 towers you shouldn't have had to notch anything, they should have bolted right up..... pictures would help a lot, with closeups of the mounts & towers.. It sounds like the front of the motor is too high which would indicate that the frame towers are small block or 6 cyl towers. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - Last edited by LockDoc; 03-26-2007 at 02:56 PM. |
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#7 |
Senior Member
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Location: Centennial, CO
Posts: 2,954
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Re: Big Block & Body Mount ???????
There's also a spacer on the trans mount for BBC trucks.
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ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ |
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#8 |
Straight jacket required
Join Date: Oct 2003
Location: OKC, OK
Posts: 882
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Re: Big Block & Body Mount ???????
The engine is high in the front, check the level out~the body mounts have two different rubber spacers. 1 is 1 1/4 inch and the other about 1 inch. Which one goes where front or back. Here are some pics. HEEEEEEELP~LOL
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1968 C10 Short Stepper 350/350 A/C P/S P/B Front disc 3/5 static/ 12bolt rear 3:73 1979 Pontiac Trans Am 10th Anniversary/455/4spd 2011 H-D Street Glide - CAMMED n lowered Dad always said,"Son, if you can't be good...be good at it." ![]() |
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#9 |
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Join Date: Oct 2003
Location: OKC, OK
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Re: Big Block & Body Mount ???????
more~
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1968 C10 Short Stepper 350/350 A/C P/S P/B Front disc 3/5 static/ 12bolt rear 3:73 1979 Pontiac Trans Am 10th Anniversary/455/4spd 2011 H-D Street Glide - CAMMED n lowered Dad always said,"Son, if you can't be good...be good at it." ![]() |
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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: Big Block & Body Mount ???????
this isn't by chance a cut down 3/4 ton frame is it? The back of the cab *seems* lower than it should be.
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#11 |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: Big Block & Body Mount ???????
He's right, those are 68-71 frame stands. They are big block though. It should clear. You need the little 1/4 inch spacer between the trans and mount if you're going to use those valve covers.
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#12 |
Straight jacket required
Join Date: Oct 2003
Location: OKC, OK
Posts: 882
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Re: Big Block & Body Mount ???????
I used the thicker body mounts up front to try and raise the cab to clear----thank you for clarifying the stands. No, this is a '68 short bed frame with '72 front and rear ends. And yes, a good tip for the tranny spacer as well. Any other advice would be appreciated to get this to clear. I don't want to cut the firewall LOL!!
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1968 C10 Short Stepper 350/350 A/C P/S P/B Front disc 3/5 static/ 12bolt rear 3:73 1979 Pontiac Trans Am 10th Anniversary/455/4spd 2011 H-D Street Glide - CAMMED n lowered Dad always said,"Son, if you can't be good...be good at it." ![]() |
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#13 | |
The Older Generation
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Location: Montezuma, Iowa
Posts: 25,515
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Re: Big Block & Body Mount ???????
Quote:
![]() LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#14 |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,515
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Re: Big Block & Body Mount ???????
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Here are some good pictures of '72 big block mounts: http://67-72chevytrucks.com/vboard/s...t=block+mounts LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#15 |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: Big Block & Body Mount ???????
I just went a found the pics of the 454 in my 70 truck. Here's a pic of how much room a set of stock valve covers has between the firewall and engine.
Here is a pic of where the mount and frame looked like.
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#16 |
Straight jacket required
Join Date: Oct 2003
Location: OKC, OK
Posts: 882
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Re: Big Block & Body Mount ???????
So what do I do??? I have a '68 frame and a '72 crossmember. Use a spacer on the tranny mount, and ?????????
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1968 C10 Short Stepper 350/350 A/C P/S P/B Front disc 3/5 static/ 12bolt rear 3:73 1979 Pontiac Trans Am 10th Anniversary/455/4spd 2011 H-D Street Glide - CAMMED n lowered Dad always said,"Son, if you can't be good...be good at it." ![]() Last edited by Inthuwind; 03-26-2007 at 08:06 PM. |
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#17 |
Registered User
Join Date: Feb 2004
Location: Tacoma WA
Posts: 1,365
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Re: Big Block & Body Mount ???????
About the frame rail notch - I know the 67 frames were full width through that area. I know by 69 they are cut back on both sides. I had always thought the factory changed in 68 - maybe this plant had some left over and made a running change after this unit was produced. Every 67 frame I have seen has had to be notched for BB stands - either 68-71 style or 72 style.
Can the the cab be scooted to the rear just a scooch by losening the mounts and then fitting a thick washer? The tranny mount spacer (about 1/8th") might also change the angle the covers meet the firewall. Keep us posted - Bob
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67 C-20 LWB, tilt, speed alert, vac, 454, T400 67 C-10 SWB, factory air with more to follow |
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#18 |
Straight jacket required
Join Date: Oct 2003
Location: OKC, OK
Posts: 882
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Re: Big Block & Body Mount ???????
My buddy and I tried to scoot the cab back, and I also thought about grinding away a little on those mounts.
__________________
1968 C10 Short Stepper 350/350 A/C P/S P/B Front disc 3/5 static/ 12bolt rear 3:73 1979 Pontiac Trans Am 10th Anniversary/455/4spd 2011 H-D Street Glide - CAMMED n lowered Dad always said,"Son, if you can't be good...be good at it." ![]() |
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#19 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Big Block & Body Mount ???????
Something else you can do too, loosen up the bolts that hold the engine to the stands, and also the stands to the frame, and pull it all forward as far as you can... may be able to get 1/4 inch out of it.
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#20 |
Senior Member
Join Date: Dec 2004
Location: Southern Pines NC
Posts: 3,853
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Re: Big Block & Body Mount ???????
Are you going to be around Friday? I changed jobs so not working in Fayetteville anymore but have to pick up my last check. Could come by and maybe see if we can figure it out. I have a bunch of BB mounts from 68-80 so we can figure something out.
Steve |
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#21 |
Junior Member
Join Date: Mar 2007
Location: Hideaway, TX
Posts: 4,950
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Re: Big Block & Body Mount ???????
You have an 72 towers and mounts to sell?
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#22 |
Account Suspended
Join Date: Aug 2006
Location: vacaville ca, because it as far from indy as i can be
Posts: 777
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Re: Big Block & Body Mount ???????
the problem is the covers. i cant run talls either because of the body and the boster
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#23 |
Senior Member
Join Date: Dec 2004
Location: Southern Pines NC
Posts: 3,853
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Re: Big Block & Body Mount ???????
Just trying to help out a friend
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#24 |
Straight jacket required
Join Date: Oct 2003
Location: OKC, OK
Posts: 882
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Re: Big Block & Body Mount ???????
I'm gonna make these work...somehow. Thanks everyone for the help. I'm going to add the tranny spacer, maybe two, and then try to move my engine forward. I am also going to put the thicker body mount bushing in the rear mounts to bring the cab level. I'll be dang if this thing kicks my ass.
__________________
1968 C10 Short Stepper 350/350 A/C P/S P/B Front disc 3/5 static/ 12bolt rear 3:73 1979 Pontiac Trans Am 10th Anniversary/455/4spd 2011 H-D Street Glide - CAMMED n lowered Dad always said,"Son, if you can't be good...be good at it." ![]() |
![]() |
![]() |
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#25 |
Senior Member
![]() Join Date: Aug 2004
Location: Centennial, CO
Posts: 2,954
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Re: Big Block & Body Mount ???????
I'd bet the trans spacer fixes it, you seem to have a lot of rearward tilt to the eng. Mine is a lot more level than that. Your level bubble should show way closer to level on top of the carb mounting surface.
__________________
ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ |
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