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#1 |
sufficiently talented fool
![]() Join Date: Jun 2006
Location: Forest Hill, MD
Posts: 2,231
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? for small block to big block swap
I pulled the 283 out of the "72, and installed a 454. It is in and bolted up using the small block mounts. Everything fits fine...except the headers. The right header clears everything fine, the left header is hitting the engine perch...BAD. I am not against denting the tube a little to introduce some clearance, but I would have to cut the front tube in half to get around this one. I have a '71 Suburban with the correct big block perches, but I don't want floor clearance issues with the TH400 trans, and also need the hood clearance for the blower. Anyone have any ideas or solutions for this dilemma?
Thanks! Bob
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"it's impossible to be surrounded by idiots when you are part of the circle" ![]() 2003 Suburban 2002 Pontiac Montana 1981 Corvette 1966 Impala Convertible Click here to support the board |
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#2 |
Registered User
Join Date: Dec 2004
Location: Northern AZ
Posts: 7,271
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Re: ? for small block to big block swap
You can cut the SBC mount and use a piece of pipe to get the curve of the 69-71 BBC mount and then the header will clear. I don't think the BBC mounts raise the engine that much?? I have seen the above mod done to a SBC mount in order to allow the BBC header tube to clear, I wouldn't beeat on the header, just make the mount fit around the tube??
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#3 |
sufficiently talented fool
![]() Join Date: Jun 2006
Location: Forest Hill, MD
Posts: 2,231
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Re: ? for small block to big block swap
I was thinking about that. I have a plasma cutter and a mig, so it would not be too big a deal, but was wondering if there were any other avenues first. That may be the way I go.
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"it's impossible to be surrounded by idiots when you are part of the circle" ![]() 2003 Suburban 2002 Pontiac Montana 1981 Corvette 1966 Impala Convertible Click here to support the board |
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#4 |
Account Suspended
![]() Join Date: Oct 2002
Location: NC
Posts: 1,129
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Re: ? for small block to big block swap
I think you can use 73 up 350 mounts that are almost the same as 72 bb mounts and only have to drill one hole for each side.I bought a 71 gmc with a 454 and thought it had correct 72 only mounts until closer look it had 2 humps spaced instead of 1 in the center like 72 only.
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#5 |
Project '67 454
Join Date: Jan 2009
Location: Columbia SC
Posts: 283
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Re: ? for small block to big block swap
I'm using frame and engine mounts from a '86 s/b suburban, the upper holes line up and you must drill a lower hole. i'm using Flowtech headers with no clearance issues
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#6 |
Project '67 454
Join Date: Jan 2009
Location: Columbia SC
Posts: 283
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Re: ? for small block to big block swap
Here are some pictures,
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#7 |
Account Suspended
![]() Join Date: Oct 2002
Location: NC
Posts: 1,129
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Re: ? for small block to big block swap
looking good thats exactly what I was talking about.
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#8 |
Wide n'Low
![]() Join Date: Jan 2007
Location: La Center, WA
Posts: 1,511
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Re: ? for small block to big block swap
That's good news, i was just going to go find my 77 350 towers/mounts to put the 454 in my 70 Blazer project. I had heard that this combination worked.
Thanks Drew
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Trippin Hazard.. 67 swb, Gold Member.. 68 Suburban Air Force Retired |
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#9 |
Registered User
Join Date: Feb 2007
Location: MI
Posts: 214
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Re: ? for small block to big block swap
hey centless, do you have a build thread.
I did a blown big block swap last year in my 72. love to see some pics and specs. |
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#10 | |
Registered User
Join Date: Jun 2006
Location: Bel Air, Maryland
Posts: 4,853
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Re: ? for small block to big block swap
Quote:
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The place where you made your stand never mattered. Only that you were there... and still on your feet.
Stephen King |
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#11 |
"THE GREEN GOBLIN"
Join Date: Mar 2008
Location: Fremont Ca.
Posts: 1,025
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Re: ? for small block to big block swap
I used 72only big block mounts with flowtech hedders with No clearence problems On my 72 truck
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![]() "THE GREEN GOBLIN" 1972 Cheyenne 10 Short Fleet Side Front 2.5inch Spindles with 2inch Springs Rear 4inch drop Springs. 454BBC TH400,Posi 1971 Cheyenne 10 Long Fleet Side 454BBC TH350,Posi ![]() Drive it like you stole it! ![]() Petey-pablo@sbcglobal.net |
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#12 |
ASE master tech/machinist
Join Date: May 2008
Location: Blue Mound Texas
Posts: 303
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Re: ? for small block to big block swap
I jumped on this late, I did one and swapped the mounts side to side, had to drill two holes, but it fixed the issue.
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#13 | |
Registered User
Join Date: Jul 2001
Location: North Louisiana
Posts: 4,501
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Re: ? for small block to big block swap
Quote:
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Wynne 70 CST short fleet Hugger orange & white, 350/350, ps, pb, air, tilt, tach/vac/speedwarning, original buckets, AM/FM, oak bed floor, shoulder belts, 3.5"/5.5" drop, 20" American Racing VN425s. Build thread 53 Chevy shortbed 69 Camaro Click here to subscribe Chevy GMC International Truck Club Louisiana Charter Member http://www.louisianaclassictruckclub.com |
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#14 |
RIP Mr Ron
![]() Join Date: Dec 2005
Location: Big Sandy, Tn. 38221
Posts: 8,166
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Re: ? for small block to big block swap
What happened. Any progress on resolving the problem.
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Ron (Mr Round Tuit) ![]() Be kinder than necessary, for everyone you meet is fighting some kind of battle TN Message Forum TN Facebook Group SETN Truck Show My Photobucket |
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