SynergyV8

iTrader: (1)

There's a new 1/4 mile track opening up this spring near my town and I just got a chance to look through their league brochures. There's a bracket racing league starting in April that I'd like to get my youngest daughter into. The brochure here says there will be three leagues, a 3.2L, a 4.5L and a 5.0L. I'm interested in the 5.0L league. The listing clearly states no power adders are allowed, naturally aspirated leagues only.

I was contemplating using a 4.8L iron block and boring it over to almost LS1 specs and use LS1-bore heads. Unfortunately, a 99mm bore and 83mm stroke comes out to 5.1L . That would be very easy to get pistons for, but unfortunately I'm stuck at 5.0L's. I'd like to use a V8, as I hope this will be a memorable father & daughter opportunity. Custom pistons are not a problem, and I'm not sure which vehicle this is going into yet. Something lightweight for sure, with a cage. What would you guys do if you were shooting for quickest ET's?

Black98Fivespeed

iTrader: (2)

Destroke a 5.3?

edit: Or do your 4.8 idea but use 5.3L pistons instead of LS1 pieces.

SynergyV8

iTrader: (1)

Saw this quick before my lunch is over....a 5.3L is a 96.01mm x 92mm motor. The 4.8L is a destroked 5.3L with the same 96.01mm bore and an 83mm crankshaft. The 4.8L has longer rods to keep the wristpin at the same height.

Ideally I'd like to use a 4" bore 6.0L block with something to the tune of a 3" stroke but a custom crankshaft and rods set is much more than what a set of pistons will cost.

DONAIMIAN

iTrader: (18)

:cough:daytona prototype:cough:

Black98Fivespeed

iTrader: (2)

By my calculations a 3.85" piston in the 4.8L would put you at 4987cc. Custom pistons aren't that expensive.

deuce_454

i would destroke a large bore engine instead... to compete in a 5.0 L class you will need big rpm and lots of head flow.. but in a drag racing class, who cares about anything but top end power.. what about a 302 SBC with some 18 deg heads? there are plenty of deals on quality slightly used stuff on racingjunk..

the problem of the stroke on the 4.8 crank can be solved by ofset grinding a stocker btw..

i would get a light car thats easy to work on, gutted g-body or FOX body is light and there is room to work and there is lots of drag suspension stuff out there, ...

how about a roller like the ones below.. you couldnt replicate for that price
http://www.racingjunk.com/post/13520...-DRAG-CAR.html
http://www.racingjunk.com/post/14218...SM-Roller.html
http://www.racingjunk.com/post/14242...DIAL-CAR-.html
http://www.racingjunk.com/post/14105...-project-.html
http://www.racingjunk.com/post/14092...ar-driver.html
http://www.racingjunk.com/post/14054...is-roller.html

First Collision

iTrader: (13)

soo... how are they gonna know it's not bigger than a 5.0L?

WYATT318MOPAR

iTrader: (28)

Probably come down to like a Claimer class in dirt track if you win all the time and other people get sick of it they gripe till tech comes and takes your motor and tears it down. Then try to explain it, not a fun time

5.3LJimmy

iTrader: (10)

A heads and cam 4.8 in something lightweight would be a decently quick and reliable setup. Put together a budget minded car and go see where the competition is at. No need to go ***** out from the get go. I say build something easy and go have fun with your daughter. If she enjoys it but is not keeping up with the competition, then look into building it bigger and better.

SynergyV8

iTrader: (1)

It must be fate that 5.3LJimmy chimes in. My daughter just got out of school and I told her about what I read; she got so excited she hopped on craigslist and found a 93 2wd 2 door Jimmy with a blown 4.3L for sale. $1000 or best offer.


It's pink.

WYATT318MOPAR

iTrader: (28)

If you cut a set of heads down or even raised the compression on a 4.8 with a set of pistons made for it. Surely it would wake up just like any other motor does. Is there a cap on the compression, or fuel you can run in the class? If the only limitation is 5.0 cubes I say you could do pretty good with one even running stock stroke and just making up the other cubes with boring the cylinders out a little.

Old SStroker

The 3.85 bore (with the 4.8 crank) allows room for some pretty good heads, and would be lots cheaper than a custom crank. I'm pretty sure you can bore an iron 4.8 to 3.85.

What kind of engines do you think you'll be running against in the 5.0 class? Are you talking max rpm~7500 and flywheel power in the low 500s...or less? Your choice of heads and valvetrain will be critical. THM 350?

Relatively inexpensive carbed LS engines are starting to show up and win in drag classes previously dominated by high-buck old school engines. If you want to go EFI, the 5.0L Daytona Prototypes which run in the 4500-7000 rpm range use the truck intake very successfully.

I think this could be fun time for your family. Pink was Shirley Muldowney's color. Go Girl!

Good luck.


Jon

IWGF

iTrader: (6)

You could always use a small block ford 5.0 motor... I know, probably blasphemy on an LS forum, but it would be much easier.... And parts are DIRT cheap. Like stupid cheap. Easy build, cheap parts, easy to make a bullet proof N/A build.... I'd say just get her a foxbody roller and drop a built 5.0 into it. Light, pretty powerful, good gears, seems like a winner to me....

KCS

iTrader: (20)

3.905" bore x 3.15" stroke will get ya 302ci. I think that would be a pretty good alternative. LS1 pistons, offset ground 4.8L crank (maybe 2.00" pin?), and then a good rod and piston. You could even use an aluminum LS1 block.

thunderstruck507

iTrader: (18)

which is what nearly everyone will do...it would be nice to be different

stevied916

iTrader: (30)

The way the intakes and heads are on those cars dont compare to how the ls motors are though. You will make more power with the ls over the 5.0

56chevyboy

you dont have to get 5.0 ford chevy made 302's as well people

deuce_454

didnt dart just come out with motown SBC style block that allows LS heads?? it would be a matter of installing a 283 crank (3 inch stroke) with bearing spacers... in that sucker allong with some long rods and flat top pistons.. throw on a pair of L92 heads and a gmpp carb intake....

that way every thing fits, even the acc brackets, front cover, and motormounts... AND the oil system can handle high RPM

http://cgi.ebay.com/ebaymotors/SB-CH...1%7C240%3A1318

deuce_454

MOTOWN LS CAST IRON ENGINE BLOCK
Technical Data:
Casting ID Number: WOR-042A
Material: High density cast iron
Cam Bearings: Standard SB Chevy
Cam Location: Standard SB Chevy
Maximum Bore: 4.200”
Cylinder Wall Thickness: .250” at
4.200” bore
Water Jackets: Expanded for better cooling
Lubrication: Priority main oiling system
Oil System Features: Integral boss for
front feed, boss for rear scavenge, rear
main cap can accept wet sump pump
Filter: Integral mount for spin-on filter
Oil Pan Rails: Solid (stock width)
clearanced for 4.000" stroke
Main Cap Material: Street and
Sportsman blocks caps are made from
nodular iron, Race blocks are made
from 1045 billet steel (unlike
competitors’ softer 1020)
Main Caps: Street block caps 1 thru 5
have 4 bolts, Sportsman and Race
blocks have splayed 4-bolt caps (2, 3,
4) and straight 4-bolt caps (1, 5)
Main Cap Hardware: 1/2" ARP and ring
dowels used to locate main caps firmly
into position (not antiquated standard
OEM outside registers)
Rear Main Seal: Two piece SB Chevy
Fuel Pump: Stock location SB Chevy
Motor Mounts: Dual (frnt & side) SBC/ LS
Cylinder Head Bolt Holes: Blind
tapped to prevent water leaks
Lifters Bosses: Clearanced for vertical
bar lifters (can use std. height LS lifters)
Clutch Linkage: Standard mounts
Starter Mount: Stock location
Weight: Approximately 190lbs.
Part # Series Type Deck Bore Mains Lifters Main Caps Max Stroke
084080 Sportsman Bare 9.240" 4.115" 400 .8437" Nodular Splayed 4.000”
084180 Race Bare 9.240" 4.115" 400 .8437" Billet Splayed 4.000”
Accessories:
832665-2 Oil restrictors for Motown SBC cast iron block
832531 Freeze & pipe plug kit for cast iron Motown SBC
832522 Dowel pin kit for Motown SBC engine block
832576 ARP head bolt kit for Motown LS cast iron block
832912 Stainless steel timing cover bolt kit (hex head)
832913 Stainless steel oil pan bolt kit (hex head)
061079 Cooling adapters for LS heads (pair required)
Available options:
Cylinder boring
Lifter bushings
50mm cam bearings
O-ring head decks
Contact your World sales representative for details.
Indexed
lifter bores
1/2" ARP and ring dowels used
to locate main caps firmly into
position (not antiquated
standard OEM outside registers)
Siamese bores
1045 billet steel main caps
utilized on Race blocks (unlike
competitors’ softer 1020)
100% compatible with
OEM parts
Expanded water
jackets for maximum
cooling capacity: 152
fl.oz. per side
Accepts stock
mechanical
fuel pump
Priority main oiling
system for optimum
reliability
Uses stock
SBC cam
bearings
Blind tapped head
bolt holes
Precision CNC-machined
in two positions to cut
down on stacked
tolerances
Integral boss for front
feed oiling system
Solid oil pan rails with
stock spacing and
clearance for 4.000"
crank (Sportsman and
Race block)
Made of high
ALL density Cast Iron
NEW Oil restrictors
Manufactured
to QS-9000
standards
THE MOTOWN LS IS A UNIQUE ONE-OF-A-KIND
BLOCK AVAILABLE ONLY FROM WORLD PRODUCTS!
The unique Motown LS block lets you utilize a full compliment of standard
small block Chevy components with the decided advantage of being able to
employ high flowing LS-type cylinder heads. In addition to the internal
components, the Motown LS allows use of expensive already-purchased items
like pulley kits and external accessories. The block also boasts a coolant
capacity in excess of 150 fluid ounces to provide superior cooling.
Motown LS blocks are offered both bare and fully race-prepped for your
convenience.
Note: The Motown block employs a
standard SBC water flow path. When
using LS-style heads on the Motown you
must use an adapter on the heads to
facilitate a return flow to the radiator.
The World Products Cooling Adapter
(p/n 061079) also accommodates
standard SBC accessory brackets

SynergyV8

iTrader: (1)

I'm not 100% sure what we'll see racing there. A colleague of mine at work gave me the brochure to read over and he has a 96 Ford Ranger with a Windsor 302 and 5 speed manual. I helped him and his son press on a few bearings and set up the rear end with 4.33's. That little truck can scoot!

I imagine there will be a good number of garage builds like that Ranger, along with factory Mustang 5.0L's, 305 Camaro's and RCSB trucks with 4.8L's. Those seem to be the norm around here. My daughter has fallen for the pink Jimmy, so tomorrow I'm going to pick her up from school after work and we're going to look at it. If everything checks out (or if she gives me the puppy eyes) with the Jimmy, I think a "5.0 liter" 4.8L motor will do well in there. I haven't spoken with my machine shop yet, but they've done a couple bored-over 5.3L's for me, so I don't think a big bore 4.8L will be a problem.

To make it easier on piston tooling, I think a 98mm x 83mm setup will do well, don't you? 306ci and 5.01L. It's 1mm shy of a stock LS1 bore, so if I use 5.3L heads I don't foresee any problems with shrouding the stock valves. I'd hope this little 5.0L would do alright with ~10.5:1 or more compression under a 7000 rpm limiter. I'm unsure of any other limitations by the league, it said details would be mailed out to participants who inquire over the phone.