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

87Lowrider · 07-14-2007, 11:27 PM

I wanna swap out the 350 in my '87 for a 454. What kind of issues will I have in doing this? I have a line on some blocks, but nothing solid yet.

68GMC454 · 07-15-2007, 01:36 AM

shouldnt be that hard..id say motor mounts, definatly 4 core radiator, it will fit in with room to spare, especially if you dont have to run all that smog crap..my 84 454 has more stuff covering the motor than my lincolns did...also you migth need another tranny..if you are pulling alot with it, get rid of the 350 turbo, and get a 400 turbo...also get ready to pass anything but a gas station... but i would definatly recommned it,, my next project truck, when i get done with the dually will be 1/2 with a 454...

87Lowrider · 07-15-2007, 01:41 AM

Great!

Motors seem to hard to find these days, but when I do, I'll get one. Just building a cruiser... no towing with this one. Thanks!

rcbildr · 07-15-2007, 12:00 PM

You can use your original mounts. I did when I replaced the 454 in my 84 Suburban with a 350. You will need a 3 core or 4 core radiator with the shroud. You may also have to modify your exhaust, I had to on the 84. The big block manifolds on my 84 had a 2.5 inch outlet and the 350 manifolds I bought have something like a 2 inch outlet.

87Lowrider · 07-15-2007, 01:08 PM

Thanks for the info!!

boatpuller · 07-15-2007, 01:12 PM

Quote:

Originally Posted by 87Lowrider

Thanks for the info!!

by the way,welcome aboard...and nice truck.i scoped her out over in the shortbed thread.hey that rhymes

bulky · 07-16-2007, 04:31 PM

Come on up to Rhode Island...I'll cut you a deal on a complete rolling chassis.... it has all the parts you will need to put a big block in, exhaust manifolds, radiator, shroud, hoses, power steering pump, motor mounts...and you can sell the rest of the truck to make your money back. ...just a thought.

http://67-72chevytrucks.com/vboard/c...ct=1758&cat=13

**Captkaos** · 07-16-2007, 04:51 PM

Does your truck still have TBI on it? What trans are you running now, and is the motor the orginal from 1987?

87Lowrider · 07-17-2007, 09:45 AM

Yes, it's original with the TBI and the 700R4. I thinks it's been gone through though, it's pretty strong.

bulky - I be sure to look u up IF I get up north. thanks!

bulky · 07-17-2007, 10:53 AM

Ahh...it's only 1000 miles... just a nice Sunday drive! I'm supposed to go visit a buddy in Wilmington OH this summer, I'll drop you a line when I go, if your still looking, I'l bring what I have.

Later

**Captkaos** · 07-17-2007, 11:59 AM

Quote:

Originally Posted by 87Lowrider

Yes, it's original with the TBI and the 700R4. I thinks it's been gone through though, it's pretty strong.

bulky - I be sure to look u up IF I get up north. thanks!

Are you planning on running the TBI on the 454? If so, it is going to be restrictive. The TBI throttle bore is larger and had bigger injectors, you also need the PROM for a 454.

07-14-2007, 11:27 PM	#1
87Lowrider Navy Radioman Veteran Join Date: Jul 2007 Location: Western Kentucky Posts: 1,356	Big Block swap I wanna swap out the 350 in my '87 for a 454. What kind of issues will I have in doing this? I have a line on some blocks, but nothing solid yet.

07-15-2007, 01:36 AM	#2
68GMC454 THE VILLIAGE IDIOT Join Date: Nov 2006 Location: Tooele, Utah Posts: 1,405	Re: Big Block swap shouldnt be that hard..id say motor mounts, definatly 4 core radiator, it will fit in with room to spare, especially if you dont have to run all that smog crap..my 84 454 has more stuff covering the motor than my lincolns did...also you migth need another tranny..if you are pulling alot with it, get rid of the 350 turbo, and get a 400 turbo...also get ready to pass anything but a gas station... but i would definatly recommned it,, my next project truck, when i get done with the dually will be 1/2 with a 454... __________________ honestly honey,,i have no idea how that truck got here.

07-15-2007, 01:41 AM	#3
87Lowrider Navy Radioman Veteran Join Date: Jul 2007 Location: Western Kentucky Posts: 1,356	Re: Big Block swap Great! Motors seem to hard to find these days, but when I do, I'll get one. Just building a cruiser... no towing with this one. Thanks! __________________ 1987 Chevrolet R10 Silverado BBC Build thread - SOLD 1986 GMC Sierra Classic - SOLD 1957 Chevy Step Side Daily Driver; 2005 Chevrolet Silverado 4x4 Z71 Stepside - SOLD 2005 Chevrolet Tahoe Z71

07-15-2007, 12:00 PM	#4
rcbildr Registered User Join Date: Sep 2000 Location: Gold Bar, WA Posts: 1,216	Re: Big Block swap You can use your original mounts. I did when I replaced the 454 in my 84 Suburban with a 350. You will need a 3 core or 4 core radiator with the shroud. You may also have to modify your exhaust, I had to on the 84. The big block manifolds on my 84 had a 2.5 inch outlet and the 350 manifolds I bought have something like a 2 inch outlet. __________________ My Projects: 1960 GMC 1/2ton with 305 V6 (daily driver) 1963 Chevy 1/2ton 2wd...converting to 4x4 1967 Suburban 1/2ton 2wd My Girlfriends Projects 1985 Chevy Suburban 3/4ton 4x4 with 6.2L diesel, 4" lift, converted to TH-400, Warn Premium manual hubs, & Wildcat 315/75/R16 tires. (daily driver) 1978 Camaro Type LT with a Marine 350 & vortec heads, Rochester Carb, & roller cam 1978 Camaro Z28

07-15-2007, 01:08 PM	#5
87Lowrider Navy Radioman Veteran Join Date: Jul 2007 Location: Western Kentucky Posts: 1,356	Re: Big Block swap Thanks for the info!! __________________ 1987 Chevrolet R10 Silverado BBC Build thread - SOLD 1986 GMC Sierra Classic - SOLD 1957 Chevy Step Side Daily Driver; 2005 Chevrolet Silverado 4x4 Z71 Stepside - SOLD 2005 Chevrolet Tahoe Z71

07-16-2007, 04:31 PM	#7
bulky Bulky Join Date: Aug 2004 Location: Rhode Island Posts: 163	Re: Big Block swap Come on up to Rhode Island...I'll cut you a deal on a complete rolling chassis.... it has all the parts you will need to put a big block in, exhaust manifolds, radiator, shroud, hoses, power steering pump, motor mounts...and you can sell the rest of the truck to make your money back. ...just a thought. http://67-72chevytrucks.com/vboard/c...ct=1758&cat=13 __________________ 2016 Silverado 1930 Model A Hot Rod 1923 Ford A/SR Altered - Injected 409 1982 Honda CB900F Super Sport Dad's 1970 GMC 9' Stepside Dad's 1969 GMC Custom Camper

07-16-2007, 04:51 PM	#8
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: Big Block swap Does your truck still have TBI on it? What trans are you running now, and is the motor the orginal from 1987? __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

07-17-2007, 09:45 AM	#9
87Lowrider Navy Radioman Veteran Join Date: Jul 2007 Location: Western Kentucky Posts: 1,356	Re: Big Block swap Yes, it's original with the TBI and the 700R4. I thinks it's been gone through though, it's pretty strong. bulky - I be sure to look u up IF I get up north. thanks! __________________ 1987 Chevrolet R10 Silverado BBC Build thread - SOLD 1986 GMC Sierra Classic - SOLD 1957 Chevy Step Side Daily Driver; 2005 Chevrolet Silverado 4x4 Z71 Stepside - SOLD 2005 Chevrolet Tahoe Z71

07-17-2007, 10:53 AM	#10
bulky Bulky Join Date: Aug 2004 Location: Rhode Island Posts: 163	Re: Big Block swap Ahh...it's only 1000 miles... just a nice Sunday drive! I'm supposed to go visit a buddy in Wilmington OH this summer, I'll drop you a line when I go, if your still looking, I'l bring what I have. Later __________________ 2016 Silverado 1930 Model A Hot Rod 1923 Ford A/SR Altered - Injected 409 1982 Honda CB900F Super Sport Dad's 1970 GMC 9' Stepside Dad's 1969 GMC Custom Camper

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