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Old 07-29-2007, 11:29 PM
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Small Block Vs. Big Block

Here it is a again...the never ending debate....Small Block Vs. Big Block.....Im not sure what I want...just sure that I need something...I need an engine for my pulling truck... Heres the specs on it....its is a 1986 Chevy Scottsdale pulling truck. The frame is a 1-ton camper special. It has Dana 60s front and rear with 5.16 gears. The back has a detroit locker and the front has mini spool with manual lockers. It has 5 foot ladder bars and drive shaft loops. It alls has bumpstops on the axle/leaves that allow no suspension flex. Weight bracket in the front and kill switch and slam stops in the back. Unfortunatley the tranmission is a Turbo 350 but Ive had heavy duty clutches installed....(if you read my introduction post sorry for the repeat)...Im not totally sure what i want... I kinda wanna go with a small block just cause it will be fun to beat the guys who talk up there big blocks....If i went this route i was thinking about a 383 stroker because its gotta lot of power and i can get high rpms out of it to keep my tires spinning.....on the other hand I kinda want to go with a big block just because they are big and beefy.... they got a lot of power but they have mad torque which would help me off the line....im just so undecided...Im only 19 and im kinda just doing this on my own as a hobby...can anyone help me? any suggestions and input is glady excepted...
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Last edited by rhanshaw; 07-30-2007 at 12:26 AM.
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Old 07-29-2007, 11:40 PM
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depends weather its your DD or not, big blocks will get you more tourque but they eat ALOT of gas, small blocks can be build to make a fair bit of power. the next thing to consider is fuel injected/carberated and Na/forced induction. a fuel injected turbo charged small block built right can make a fair bit of
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Old 07-29-2007, 11:44 PM
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In my opinion, no question about it......makes no sense to send a boy to do a man's job.....
http://www.speedomotive.com/ps-89-7-...roker-kit.aspx
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Old 07-30-2007, 12:15 AM
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I,m with TECH all the way but as I ask on most threads...How much money do you have to spend?? It will cost more money to make a small block perform to big block standards. If you're on a budget like most of us, I would find a good rebuild-able 454 and hot rod it to your application.
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Old 07-30-2007, 12:21 AM
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I wanna keep it simple with just a carb no EFI...and turbo chargers and superchargers arnt allowed....and as far as that link to the stroker kit...WOW....that kit is for a 454? its seems a little to much for me right now.... i wanna have something that i can have fun with but still be competitive with you kno what i mean? and as far as a budget goes i want sumthing that wont totally break me... i dont know a whole lot about engines so im kinda just gettin my feet wet... some people tell me to go ahead and beef up a big block into a monstor and others say go with the high rpms of a stroker....im just not sure what i need for this application... ps what do you think of that ugly ducklin truck
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Old 07-30-2007, 12:56 AM
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There is no such thing as an ugly duckling. Anything that turns money into noise is a beautiful thing.

All comes down to airflow. You can move more air through a big block and make more power without having to buzz it to the moon and break parts.

A 632 with good parts and revved to 7,000 rpm's will pass 1,280 cubic feet per minute of air/fuel mixture through her innards at 100% volumetric efficiency.

A 383 with unobtainium parts and revved to 11,550 rpm's will pass 1,280 cubic feet per minute of air/fuel mixture through her innards at 100% efficiency. Not gonna happen.

Authors note: There is no such thing as unobtainium, it's an inside joke.

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Old 07-30-2007, 01:03 AM
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is going with something in the middle an option...like a 400 or a 427?
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Old 07-30-2007, 01:16 AM
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Stock big blocks start at the 396, then 427, 454 and 502.

Starting with a 454 block and boring it 0.060" over, you'd have a 496 with this budget stroker kit.....
http://www.speedomotive.com/ps-82-7-...crank-kit.aspx
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Old 07-30-2007, 11:50 AM
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Quote:
Originally Posted by techinspector1
Stock big blocks start at the 396, then 427, 454 and 502.

Starting with a 454 block and boring it 0.060" over, you'd have a 496 with this budget stroker kit.....
http://www.speedomotive.com/ps-82-7-...crank-kit.aspx
Or you can get an 8.1 liter out of a newer truck, which is already 496 cu in.
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Old 07-30-2007, 11:59 AM
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I would go with a big block in this situation. You are not going to get the tq out of a small block for the same money. You can build a healthy BB and not break the bank, some of the kits listed here are a good place to start. You really don't need to stroke it of the bat either, go with a good set of heads and a get the compression up so you can run a stout cam and go have some fun.
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Old 07-30-2007, 12:09 PM
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Quote:
Originally Posted by joe_padavano
Or you can get an 8.1 liter out of a newer truck, which is already 496 cu in.
I would not use a 8.1 liter due to lack of performance parts for the block/heads.
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Old 07-30-2007, 12:24 PM
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Why not look at a 12 valve Cummins diesel with a 5spd. You'll need a good clutch but it will be a pulling machine. It's no trick at all to get 400+ hp and 850 foot lbs. Quite inexpensive hp adders. You'll need a Dana 80 rear end too. This is a common swap. No electronics at all. Wire the starter and shut off solenoid. You'll probabbly need a runaway protector for the rules most likely. simple air dam.
Cummins weighs about 1100 so add some good front end springs.
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Old 07-30-2007, 12:31 PM
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Quote:
Originally Posted by bentwings
Why not look at a 12 valve Cummins diesel with a 5spd. You'll need a good clutch but it will be a pulling machine. It's no trick at all to get 400+ hp and 850 foot lbs. Quite inexpensive hp adders. You'll need a Dana 80 rear end too. This is a common swap. No electronics at all. Wire the starter and shut off solenoid. You'll probabbly need a runaway protector for the rules most likely. simple air dam.
Cummins weighs about 1100 so add some good front end springs.
I really, really like this post. Common sense to the fore.
These guys can supply any spring for any vehicle. Call 'em up.
http://www.eatonsprings.com/
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Old 07-30-2007, 01:50 PM
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Go BB you'll thank yourself later. ESPECIALLY pulling
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Old 07-30-2007, 02:06 PM
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454's can be built very cheaply if you buy a used engine with 049 or 781 heads.

install bigger valves (2.19/1.88) and blend in the seats (bowl smoothing)
arp rod bolts
bore with torque plates (+0.060)
balance
double roller timimg chain
performer rpm intake with a 850 holley
headers with 3 inch exhaust and hooker aero-chamber mufflers
Compcam 292H with proper valve springs, 3/8 pushrods, guide plates, roller rockers, remove exhaust spring spinners and replace with spacers
domed pistons that make 9.5 to 10.0 cr with 123cc heads (049 or 781).
2800 stall
MSD ignition with a 6000 rpm rev limiter
mallory comp140 fuel pump with regulator
set up mains and rods at 0.002" and rear main at 0.003".

Should easily make 500hp and 500 ftlbs.

Use diesel engine old with your new cam.
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