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12-07-2011, 05:01 PM
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#1 |
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Registered User
Join Date: Dec 2010
Location: clifton forge,va
Posts: 11
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big block upgrade
i have a 72c10 that had a factory small block.thought about going with a 454 with th350 or 400.just wondering how many changes i'll have to make. any help would be appreciated.
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12-07-2011, 09:25 PM
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#2 |
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Registered User
 Join Date: Nov 2008
Location: Midwest
Posts: 35
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Re: big block upgrade
We bolted a 454 into a 1970 gmc 1/2 ton. Our truck has a 4 speed tranny the only mod we had to make were to the header on the drivers side too clear the clutch shaft. It bolted right in, including using the small block frame mounts.
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1969 GMC 4x4, 4 speed, 350 Fleet Side in progress. 1969 Camaro SS 427 Cortez Silver. owner since 1974 1964 Chevelle 4 Door, 427 Big block,Turbo 400 1/4 Mile 10.52 @ 125.85 mph. 1.39.1 60' 1982 Crew Cab 3+3, 2WD 3.21 Locker, 468/4 speed 1969 C30 4 speed (IL6) future build. |
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12-08-2011, 01:23 AM
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#3 |
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Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
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Re: big block upgrade
We put a '74 in front of a SM-465 in my '71 lwb stepper using the engine mounts that came with the 454 without a problem other than we had to modify the clutch bracket on the frame.
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'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
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12-08-2011, 08:16 AM
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#4 |
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Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,154
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Re: big block upgrade
Exhaust manifolds or headers, cooling, pulleys and brackets if you don't have them, mounts, 454 is externally balanced so would need a different flexplate or flywheel. It can add up fast.
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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12-08-2011, 10:12 PM
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#5 |
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Registered User
Join Date: Jul 2010
Location: Las Vegas, NV
Posts: 969
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Re: big block upgrade
Keep in mind the additional weight will effect your ride height.
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Mark 1972 C10 SWB LS1/T56 6 speed trans/4:56 posi with 5.5"-7" static drop/Boss 338 Wheels 18"x20" My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=424609. My first start up http://youtu.be/R899YQ1OcjU |
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12-08-2011, 11:13 PM
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#6 |
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Registered User
Join Date: Sep 2009
Location: outside atlanta
Posts: 156
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Re: big block upgrade
what he said^^^^ i had lowering springs and a small block. I put a big block in and the truck settled another 2 inches,destroying my bumstops in the process
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officer,we weren't racing.. he was merely pacing me. |
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