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#1 |
Registered User
Join Date: Mar 2007
Location: oklahoma
Posts: 118
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big block installation?
i was just wondering what problems ou gys ran into when installing big blocks in your 4x4 blazers. I would like to know be prepared before i dive in. thanx
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#2 |
Registered User
Join Date: Mar 2006
Location: USA
Posts: 21,020
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Re: big block instalation?
Hei/firewall clearance,valve cover/firewall clearance, just to name a few...
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#3 |
Old School, New Style
Join Date: Jun 2005
Location: Monroeville, Ohio
Posts: 790
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Re: big block instalation?
The engine and tranny are positioned closer to the firewall for clearance of the front axle. This makes it a real PITA to fit the big blocks. The factory never offered a big block in 4x4 trucks from 67-72. Some people beat in the firewall for clearance and some people have done body lifts. All trucks are a little different because some people have installed the big blocks without modification but I think you would have to get real lucky for that. If you have a suspension lift you could look into moving the engine and tranny forward on the frame a few inches but that would probably require drive shaft work. Hope this info helps.
Aaron
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The Good: - 72 GMC Jimmy 4x4 - 307 cid / 350 th - 70 Chevy Suburban 1/2T 2wd - 454 cid /400 th - 96 Chevy Impala SS - mainly stock - 98 Chevy Tahoe LT 4x4 - all stock The Bad: - 86 Chevy Suburban 1/2T 4x4 - winter beater The Ugly: - 72 Chevy Suburban 1/2T 2wd - parts truck |
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#4 |
Registered User
Join Date: Dec 2003
Location: Houston, TX
Posts: 734
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Re: big block instalation?
The Fox had a 454 before I bought it, and still has the badges. The firewall is intact, but it looks like the motor mounts were moved aft. There's a crosspiece connecting them under the pan and the whole assy looks moved. My stroker is sitting on those mounts now, and the distributor and valve covers are close but not touching. Once upon a time I had HEI and it cleared too. I've got almost a foot of clearence between the radiator and harmonic balancer. Let me know if you want pix and I'll see what I can do.
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'72 K5, known as 'the Fox.' |
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#5 |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,538
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Re: big block instalation?
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#6 |
Registered User
Join Date: Dec 2003
Location: Houston, TX
Posts: 734
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Re: big block installation?
I'm running electric fans on the radiator, and no shroud. I just measured 9 inches radiator to pulley.
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'72 K5, known as 'the Fox.' |
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#7 | |
Always on the hunt...
![]() Join Date: Sep 2006
Location: Portland, OR.
Posts: 5,604
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Re: big block installation?
Quote:
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#8 | |
I'm a poor spectator
Join Date: Aug 2006
Location: San Antonio, Tx
Posts: 2,287
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Re: big block installation?
Quote:
You're right, it looks factory, nice job.
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2006 Jeep Unlimited IMPACT ORANGE 1993 Chevy 2500 4x4 ExCab LWB 454/NV4500 Tow rig ![]() 1977 Ford F100 2x4 LWB 1st truck I owned, still have it!!! ![]() 1979 Ford F150 4x4 SWB Built Ford Tough!!! ![]() 1971 Chevy Blazer 350 / SM465 / NP205 UNDER CONSTRUCTION Soon to have a LQ4 6.0!!! |
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#9 |
Senior Member
![]() Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,505
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Re: big block installation?
Nice work, CB!! Saw some pics of your truck on the dunes awhile back, truly amazed at the quality rebuild.
Just wondering, got lotsa go but what about the whoa! Is that a 1/2 ton brake system on the right of your engine? Just curious, because the 3/4 ton brake mod. is my next move. Got all the parts...BTW, did I say I liked your truck!!!
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Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim Last edited by jaros44sr; 09-05-2007 at 06:16 PM. |
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#10 |
Old School, New Style
Join Date: Jun 2005
Location: Monroeville, Ohio
Posts: 790
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Re: big block installation?
The other day an idea came to me. What if someone was to swap a 700 auto tranny in place of a 350? I know that the 700 is longer but by how much. This swap would move the BB closer to the radiator and would not require any driveshaft changes. Just thinking out load.
Aaron
__________________
The Good: - 72 GMC Jimmy 4x4 - 307 cid / 350 th - 70 Chevy Suburban 1/2T 2wd - 454 cid /400 th - 96 Chevy Impala SS - mainly stock - 98 Chevy Tahoe LT 4x4 - all stock The Bad: - 86 Chevy Suburban 1/2T 4x4 - winter beater The Ugly: - 72 Chevy Suburban 1/2T 2wd - parts truck |
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#11 |
Registered User
Join Date: Jun 2007
Location: Cabot,AR
Posts: 12
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Re: big block installation?
I do like the set up. I have a 700r4 built and ready to be installed. Just waiting on the engine. I have had my truck since 2002 and stopped driving it in 2003 due to a wiring/ oil problem. Since then I have replaced both rockers, Lt and RT floor boards and numerous other things. The trucks and work yall do on this site is great and gives me great ideas. I hope mine turns out like some on this site.
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