what year big block is the best for swap? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

slt0066 · 06-28-2007, 09:24 PM

just wondering if you guys had any info, or if there was anything to look out for. I am wanting to find a big block for my 72 c10 short bed. Just curious if maybe the older ones, like early 70's are any better than newer ones or something like that.
I ve found a 1986 chevy truck 3100 with a 454 and auto transmission. would that be a good donor you think if i can get it cheep enough and just freshen up with a basic rebuild.?
what kind of hp can i expect .....and yes im like every one else i want 700hp on pump gas for $2500

**LockDoc** · 06-28-2007, 10:36 PM

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Mine is supposed to be a '75 but I have never checked it out. All I know is it fits good and runs good. It has the early big block mount towers and these DynoMax full length headers from Summit. WLK-85022 (used with a TH400). I would try to find an equivalent header in a little better quality. I wasn't real thrilled with the quality... I guess they would be OK for a driver if you were putting all new exhaust on.

LockDoc

*trkklr77* · 06-28-2007, 10:39 PM

anything after 73 will be a 215hp 454, stock. may have 049 large port ovals but more than likely be a peanut small port head. especialy a 86.
open chamber heads
2 bolt main

anything before WILL have
large oval port heads
be a minimum of 270hp ,ls3 396/402
open or closed chamber heads[closed chambers are better for power.]
2 or 4 bolt main.

i have a 78 454 with a huge cam and 049 heads and it easily made 300hp

06-28-2007, 09:24 PM	#1
slt0066 Registered User Join Date: Jun 2006 Location: concord, north carolina Posts: 50	what year big block is the best for swap? just wondering if you guys had any info, or if there was anything to look out for. I am wanting to find a big block for my 72 c10 short bed. Just curious if maybe the older ones, like early 70's are any better than newer ones or something like that. I ve found a 1986 chevy truck 3100 with a 454 and auto transmission. would that be a good donor you think if i can get it cheep enough and just freshen up with a basic rebuild.? what kind of hp can i expect .....and yes im like every one else i want 700hp on pump gas for $2500 Last edited by slt0066; 06-28-2007 at 09:25 PM.

06-28-2007, 10:36 PM	#2
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,818	Re: what year big block is the best for swap? - Mine is supposed to be a '75 but I have never checked it out. All I know is it fits good and runs good. It has the early big block mount towers and these DynoMax full length headers from Summit. WLK-85022 (used with a TH400). I would try to find an equivalent header in a little better quality. I wasn't real thrilled with the quality... I guess they would be OK for a driver if you were putting all new exhaust on. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

06-28-2007, 10:39 PM	#3
trkklr77 Account Suspended Join Date: Aug 2006 Location: vacaville ca, because it as far from indy as i can be Posts: 775	Re: what year big block is the best for swap? anything after 73 will be a 215hp 454, stock. may have 049 large port ovals but more than likely be a peanut small port head. especialy a 86. open chamber heads 2 bolt main anything before WILL have large oval port heads be a minimum of 270hp ,ls3 396/402 open or closed chamber heads[closed chambers are better for power.] 2 or 4 bolt main. i have a 78 454 with a huge cam and 049 heads and it easily made 300hp



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