Big Block Swaps simplified - The 1947 - Present Chevrolet & GMC Truck Message Board Network

farmtruckIII · 04-25-2006, 08:57 PM

Hello all, I have been gone for a while but I did manage to find time to get the 454 shoe horned into the farm truck. After talking with some folks I decided to just do it my way. I sat the 454 on the stock 350 mounts, but it sat a bit too far forward. So then I got to looking at this issues, jacked the motor up and swapped the frame mounts side to side. Slid the mounts towards the front of the slot and drilled the holes for the bottom bolts. It made for tight clearance with my headers but it all fits! I was thinking of making a swap book what do y'all think?

Tx Firefighter · 04-25-2006, 10:50 PM

What are you going to run for exhaust manifolds or headers? That's usually the main trouble with using small block stands.

farmtruckIII · 04-27-2006, 05:10 PM

I clearanced the frame stad a tad bit and had to slightly dimple the header tube a wee bit. It all fits great! But however I am unsure if the BB headers are going to work with the drop componets I bought.

junkyardjohn · 04-27-2006, 09:02 PM

I'VE PUT SEVERAL BIG BLOCKS IN THESE TRUCKS, & THEY SEEM TO BE MADE FOR THEM (NO SURPRISE....THEY WERE). I HAVE ALWAYS USED THE CORRECT BIG BLOCK MOUNTS & HAVE NEVER HAD TO TRIM OR NOTCH OR DIMPLE ANYTHING. I GUESS YOU COULD SAY THEY FIT BETTER THAN GREAT.

JOHN

TP from Cntl PA · 04-27-2006, 09:16 PM

That is how they had the 454 in my K-20............Only problem was they cut some of the steel away on the plates where the motor mounts bolt to.........When we took the engine out, I wasn't too supprised when I seen that side was all cracked up from lack of structural strength. Luckly I have some extras to replace it.

J Y Dog · 04-27-2006, 09:35 PM

Quote:

Originally Posted by junkyardjohn

I'VE PUT SEVERAL BIG BLOCKS IN THESE TRUCKS, & THEY SEEM TO BE MADE FOR THEM (NO SURPRISE....THEY WERE). I HAVE ALWAYS USED THE CORRECT BIG BLOCK MOUNTS & HAVE NEVER HAD TO TRIM OR NOTCH OR DIMPLE ANYTHING. I GUESS YOU COULD SAY THEY FIT BETTER THAN GREAT.

JOHN

Amazin' ain't it get the correct parts and no extra effort is required.( ya Caps lock is 0N)

JYD

big blue 72 · 04-27-2006, 09:58 PM

JYJ likes the CAPS.

farmtruckIII · 04-28-2006, 07:09 AM

When working with limited funds and resources you do what you have to. I would have used big block stands if I could have found them. The clearance was miniscule not enough to hinder the performance of the mount, or effect exhaust flow in the header tube. I do know enough not to go hacking on a motor mount. This was a poor mans BB swap.

04-25-2006, 08:57 PM	#1
farmtruckIII 71 GMC 454/TH400 Join Date: Dec 2005 Location: Blue Mound TX Posts: 214	Big Block Swaps simplified Hello all, I have been gone for a while but I did manage to find time to get the 454 shoe horned into the farm truck. After talking with some folks I decided to just do it my way. I sat the 454 on the stock 350 mounts, but it sat a bit too far forward. So then I got to looking at this issues, jacked the motor up and swapped the frame mounts side to side. Slid the mounts towards the front of the slot and drilled the holes for the bottom bolts. It made for tight clearance with my headers but it all fits! I was thinking of making a swap book what do y'all think? __________________ "The bigger you are the harder you fall, the farther you walk the longer you crawl."

04-25-2006, 10:50 PM	#2
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Big Block Swaps simplified What are you going to run for exhaust manifolds or headers? That's usually the main trouble with using small block stands. __________________ I'm on the Instagram- @Gearhead_Kevin

04-27-2006, 05:10 PM	#3
farmtruckIII 71 GMC 454/TH400 Join Date: Dec 2005 Location: Blue Mound TX Posts: 214	Re: Big Block Swaps simplified I clearanced the frame stad a tad bit and had to slightly dimple the header tube a wee bit. It all fits great! But however I am unsure if the BB headers are going to work with the drop componets I bought. __________________ "The bigger you are the harder you fall, the farther you walk the longer you crawl."

04-27-2006, 09:02 PM	#4
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,427	Re: Big Block Swaps simplified I'VE PUT SEVERAL BIG BLOCKS IN THESE TRUCKS, & THEY SEEM TO BE MADE FOR THEM (NO SURPRISE....THEY WERE). I HAVE ALWAYS USED THE CORRECT BIG BLOCK MOUNTS & HAVE NEVER HAD TO TRIM OR NOTCH OR DIMPLE ANYTHING. I GUESS YOU COULD SAY THEY FIT BETTER THAN GREAT. JOHN __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST

04-27-2006, 09:16 PM	#5
TP from Cntl PA Registered User Join Date: Apr 2003 Location: Central PA....In the Berg of Nisbet Posts: 790	Re: Big Block Swaps simplified That is how they had the 454 in my K-20............Only problem was they cut some of the steel away on the plates where the motor mounts bolt to.........When we took the engine out, I wasn't too supprised when I seen that side was all cracked up from lack of structural strength. Luckly I have some extras to replace it. __________________ '72 K-20 EFI'ed 250 Inline/4spd stake body, Farm Truck '71 C-20 Cummins Diesel Powered, In storage thanks to $5.00 diesel! '69 3500 GMC 305V-6/4spd, Still under reconstruction.......... Inlines Rule! 6 soldiers standing is better than 8 laying down!!!!!!!!

04-27-2006, 09:58 PM	#7
big blue 72 Senior Member Join Date: May 2002 Location: hamilton,ohio,usa Posts: 1,499	Re: Big Block Swaps simplified JYJ likes the CAPS.

04-28-2006, 07:09 AM	#8
farmtruckIII 71 GMC 454/TH400 Join Date: Dec 2005 Location: Blue Mound TX Posts: 214	Re: Big Block Swaps simplified When working with limited funds and resources you do what you have to. I would have used big block stands if I could have found them. The clearance was miniscule not enough to hinder the performance of the mount, or effect exhaust flow in the header tube. I do know enough not to go hacking on a motor mount. This was a poor mans BB swap. __________________ "The bigger you are the harder you fall, the farther you walk the longer you crawl."



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