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#1 |
krazy hillbilly from Kentucky
Join Date: Feb 2007
Location: Paris, IL
Posts: 121
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638 cid Big Block in a 69 CST/10 Shortbed
I'm wanting to build a Big Block for my 69 CST/10 and badge everything up like a 396 to fool the untrained eye. I'm looking at a Dart Big M block that is capable of 4.625" bore and 4.75" stroke. I'm wanting to keep a mild cam in it and iron heads so it runs and looks close to a stock engine. Preliminary runs on my Dyno program comes up with around 750lb-ft of tq@2K RPM and 502hp@4500RPM. The question I have is: has anyone done anything close to this power range in one of these pickups and what has to be done in ways of rear end, transmission,...etc. to handle this kind of power? Also, if anyone has any parts suggestions to stuff in this engine, please advise, remember I want to keep it stock appearing and idling.
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#2 |
SLOW BUT SURE,BUT CLOSER
Join Date: Feb 2002
Location: eleanor wv usa
Posts: 3,093
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
Why? Thats alot for the street nothin' wrong with a BB but you can go to much with one.
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69 C-10, OWNED 35YRS... 350 over 30, 350 Turbo, 3:73 Posi P/S, P/B Black with red and black int. ''LOVE THESE OLD ''TRUCKS....... ![]() ![]() ![]() |
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#3 |
Registered User
Join Date: Feb 2007
Location: T-TOWN
Posts: 26
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
i have a 502 in my truck and it made close to 700 hp to the back wheels and i havent had a problem with anything other than killing the tires when it leaves,and it has been 10.11@130mph weighing 4050. I also have a dart big m block,it's brand new still in box,it has billet splayed main caps
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#4 |
krazy hillbilly from Kentucky
Join Date: Feb 2007
Location: Paris, IL
Posts: 121
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
mostly bragging rights, and I want to go with something that noone else has, I know it's a lot, which is why I want to keep it tame in the cam. There's too many crate 572s being dropped in everything these days, I want something different, something that's as custom as the rest of the truck is going to be. It's not meant to be a street racer and I know I'll never be able to hook it up on the street, but I might get up the nerve to take it to the strip every now and then, to quote the infamous Carrol Shelby "Too much Horsepower is just enough" =)
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#5 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
Somrthing cool about an old truck with way more power than you "need."
![]() In a simular subject.I bought a truck a while back that was an origunal big block truck,still very original.I restored it all original but used an LS6 crate motor using all the 402 stuff on top and painted everything factory colors and used factory stickers.It was powerful,reliable,yet I showed it as original.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#6 | |
krazy hillbilly from Kentucky
Join Date: Feb 2007
Location: Paris, IL
Posts: 121
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
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#7 |
Senior Member
Join Date: Jan 2005
Location: Loveland Co.
Posts: 3,098
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
I can't imagine anything rearend or suspension wise would break until you try to make it hook up. As long as the tires are the weakest link you SHOULD be o.k.
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Chris 74 Custom Deluxe SWB 350/350/3.73’s 99 2wd Silverado RCSB 5.3/4L60/3.90’s http://www.classictrucks.com/feature...short_bed.html |
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#8 | |
Sinister Exaggerator
Join Date: Feb 2006
Location: Eugene, Oregon
Posts: 111
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
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69 c10 Chevy Long Fleet 350/350 *under construction* Poor man's disc brake upgrade with HydroBoost from '82 diesel Blazer tank with "John Fabris" stake pocket filler (Genius!) |
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#9 |
Registered User
Join Date: Dec 2006
Location: Rhode Island
Posts: 602
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
Gotta love those BBC SWB C-10's. You're singing the song I love to hear.
No experience with an engine that big, but (but I'd love to). One thought though. Due to the "swept volume" of the cylinders that have to be filled, what would notmally be a very radical cam on a smaller engine would be tamer on a huge engine like the 638. So, don't underestimate how much cam it needs to even be "tame". Talk to the cam experts with your requirements. Regarding the anticipated performance, please let us know if you'll be using a neck brace or high back bucket seats. Thanks.
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69 C-10 SWB Fleetside 454/TH400 (For Sale) http://67-72chevytrucks.com/vboard/c...ct=1299&cat=12 70 El Camino 454 TH700 29 Model A 4-DR Sedan Deluxe |
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#10 |
Account Suspended
Join Date: Mar 2003
Location: ** THE FALL GUY **CHICAGO IL
Posts: 5,883
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
hello heres a picture
dart big block 638 ci 10:1 comp $20,000 engine clink the link in my signature thats what one sounds like Last edited by rage'nrat638; 07-12-2007 at 06:56 AM. |
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#11 | |
krazy hillbilly from Kentucky
Join Date: Feb 2007
Location: Paris, IL
Posts: 121
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
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#12 |
I survived Dead Man's Curve.
Join Date: Apr 2006
Location: The Nine-Five-687
Posts: 389
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
Wow, that 638 is coming to eat people! That thing sounds like a beast.
I believe someone said "Everybody is dropping in a 572 these days, I want to do something different." Well, I admire your drive to go larger, but I know I sure as Hell don't have a 572! I wish! So... hook a brotha' up if you have any lying around.
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"The people should not be afraid of their government. The government should be afraid of it's people." "The Hurricane" 1967 Chevrolet C10 350 Eight Cylinder, 700R4 BowtieOverdrive Cherry Bomb... Disturbing the Peace Since 1968. ![]() |
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#13 |
krazy hillbilly from Kentucky
Join Date: Feb 2007
Location: Paris, IL
Posts: 121
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
Now you've gone and done it. Now I'm gonna have to have the smile surgically removed from my face after hearing and seeing that 638. As for the 572 comment, I'm just saying that the 572 is a very popular custom vehicle engine these days, I don't want anything about this truck to be the "norm" It's easy to say, "I've got a 572 crate engine in there", lots of custom car builders choose that engine, and I'm not saying it's a bad engine, cuz I love the 572, I'm just saying that it's cooler to push it to the limit and say "it's a 638 cubic inch Big Block that I built in my garage" But at the same time, badge it up as a normal 396 so the untrained eye won't know what it really is.
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#14 |
Broken Down
Join Date: Dec 2006
Location: Choctaw, Oklahoma
Posts: 1,267
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
Good luck on your project!!! hope you don't break your pocket book on it
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kenm78 1982 Chevy 4X4 Project truck ![]() ![]() ![]() ![]() “It’s better to keep your mouth shut and let people wonder about your ignorance, than open your mouth and reveal all doubt” |
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#15 |
Account Suspended
Join Date: Mar 2003
Location: ** THE FALL GUY **CHICAGO IL
Posts: 5,883
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
get ready to spend some cash i spent $10,000 fixing stuff i broke
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#16 |
krazy hillbilly from Kentucky
Join Date: Feb 2007
Location: Paris, IL
Posts: 121
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
What all did you break with that engine? Have you ever had it on a dyno to see how much it puts out? As for breaking my budget...yeah, it's gonna be a while, I'm gonna do a close to stock 350 or a nice 500hp 406cid SBC for now and do the body and interior up, then we'll start on the dragon's breath under the hood. Maybe that's what I'll name the truck "Dragon's Breath" Lay down a black basecoat, then spray green glitter paint lightly over the top, then seal it all with a good covering of clearcoat. Then I'll have to have the thunder under the hood,
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#17 |
krazy hillbilly from Kentucky
Join Date: Feb 2007
Location: Paris, IL
Posts: 121
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
To Ragen' Rat638, if you wouldn't mind could you send me a mod list of what's in your 638? That'd get me started in the right direction anyway. Have you ever had that 638 on a dyno? If so, how much?
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#18 |
krazy hillbilly from Kentucky
Join Date: Feb 2007
Location: Paris, IL
Posts: 121
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
I finally got my avatar and everything up!!!! Doing this to check on the signature.
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1969 Chevy CST/10 "Old School lives and breathes in the heart of a chosen few ![]() 1984 Chevy C10 Silverado "Life, Liberty, and Ford's Pursuit of Chevy taillights" You say "Obsessed with my trucks" like it's a bad thing |
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#19 |
Chevy Truck Addict
![]() Join Date: Aug 2006
Location: Kelowna, BC
Posts: 1,176
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
Well all I have to say is
![]() ![]() ![]() Holy crap RAGENRAT, the motor sounds wicked. Gave me goosebumps listening to it. Good luck with your project bhunt31. Anything would be cool with a 638 cid engine in it, especially a Chevy truck.
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. 1970 Chev C/10 SWB, 355 SBC, 700R4, 3.73 Posi, Air Ride (Click to view Build Thread) (SOLD) 1978 Chevy C/10 SWB 1970 Pontiac Lemans . |
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#20 |
NCStroker
Join Date: Aug 2006
Location: NC
Posts: 89
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
just my opinion- if your going to spend that much coin on a motor of that magnitude, why wouldnt you try to get all the power out of it you could? You can make 500hp easy on a supercharged 350 for a fraction of the cost. again, just my opinion.
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1971 Chevy C/10-Built 383 Stroker ![]() |
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#21 | |
Chevy Truck Addict
![]() Join Date: Aug 2006
Location: Kelowna, BC
Posts: 1,176
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
Quote:
Just my opinion but when someone hears the roar of your truck pulling into a parking lot, comes over to check it out and asks "Oh my god, what have you got in that thing?" What is going to sound cooler? A Supercharged 350 ![]() or A 638 cubic inch big block ![]()
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. 1970 Chev C/10 SWB, 355 SBC, 700R4, 3.73 Posi, Air Ride (Click to view Build Thread) (SOLD) 1978 Chevy C/10 SWB 1970 Pontiac Lemans . |
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#22 |
krazy hillbilly from Kentucky
Join Date: Feb 2007
Location: Paris, IL
Posts: 121
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
Just something about a Big Block. Plus I won't have the whine of the charger giving things away. Just the shaking of the asphalt when I roll up. Also, the way I am, if I'm gonna build a big block, I'm gonna build a BIG block. I wanna keep the cam tame so I can actually drive it. I've got a monster cam in the 350 in my 84 Silverado right now and it's nothing nice to try to drive around. It puts the idle at 1200, so yeah...it's coming out soon. Cool thing about it is it'll slide the back end sideways at 90 in 2nd gear,
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1969 Chevy CST/10 "Old School lives and breathes in the heart of a chosen few ![]() 1984 Chevy C10 Silverado "Life, Liberty, and Ford's Pursuit of Chevy taillights" You say "Obsessed with my trucks" like it's a bad thing |
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#23 |
I survived Dead Man's Curve.
Join Date: Apr 2006
Location: The Nine-Five-687
Posts: 389
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
How about a 638 Supercharged?
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"The people should not be afraid of their government. The government should be afraid of it's people." "The Hurricane" 1967 Chevrolet C10 350 Eight Cylinder, 700R4 BowtieOverdrive Cherry Bomb... Disturbing the Peace Since 1968. ![]() |
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#24 |
krazy hillbilly from Kentucky
Join Date: Feb 2007
Location: Paris, IL
Posts: 121
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
you're gonna get me in a lot of trouble....that's a really good idea though....what am I saying? am I
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1969 Chevy CST/10 "Old School lives and breathes in the heart of a chosen few ![]() 1984 Chevy C10 Silverado "Life, Liberty, and Ford's Pursuit of Chevy taillights" You say "Obsessed with my trucks" like it's a bad thing |
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#25 |
KEEP ON TRUCKIN'
![]() Join Date: Jun 2005
Location: Sterling, Va.
Posts: 5,731
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Re: 638 cid Big Block in a 69 CST/10 Shortbed
Damn, that rat sounds great.
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JIM '97 GMC Sierra K1500 '95 Chevy Silverado C1500 '71 Cheyenne Z71 / LT1 & 4-Speed SWB K/10 ![]() http://www.youtube.com/watch?v=4l689JKXPnA http://67-72chevytrucks.com/vboard/payments.php "LIVIN' FREE FOREVER" ![]() |
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