lunati 496 BBC engine build-up



lunati 496 BBC engine build-up

Postby grumpyvette » March 21st, 2009, 5:52 pm

heres an interesting bbc build in a magazine article


http://www.chevyhiperformance.com/tech/ ... index.html

viewtopic.php?f=53&t=9986&p=38689#p38689

Westech Performance 496 Chevy Big Block Build - A Monster Is Born
Shopping Cart
DESCRIPTION PN PRICE
AFR Cylinder heads (complete) 2101 $2,485
ARP Head bolts 135-3703 $70
COMP Rockers 1.7:1 Pro-Magnum 1320-16 $318
Intake pushrods (8.580-inch) 7906-8 $88
Exhaust pushrods (9.470-inch) 7757-8 $136
Camshaft 11-825-9 $328
Lifters 888-16 $501
Adjustable billet timing gear 8110 $214
Two-piece timing cover 271 $258
Spacer VH311 $20
EDELBROCK Victor Jr 454-R manifold 2902 $225
FEL-PRO BBC gasket kit 2805 $124
GM Gen VI big-block 12561353 $1,200
HOLLEY 1,000 cfm 80513-1 $740
LUNATI Rotating assembly EA496FMTD $4,380
Crank 4.250
Rods 6.800
King rod bearings CR849HP
King main bearings MB5147HP
Wiseco 48cc pistons WISK238A6
Wiseco rings WIW100F8-4310-5
MILODON Oil pan 30955 $304
Oil pump 18760 $68
Oil pump pickup 18201 $57
MSD Distributor 85561 $253


Dyno Chart
RPM LB-FT HP
3,500 579.7 386.3
3,600 579.6 397.3
3,700 583.0 410.7
3,800 587.1 424.8
3,900 589.6 437.8
4,000 591.2 450.3
4,100 593.8 463.6
4,200 597.8 478.1
4,300 602.7 493.5
4,400 607.7 509.1
4,500 614.3 526.4
4,600 621.5 544.3
4,700 629.9 563.7
4,800 637.0 582.2
4,900 642.1 599.0
5,000 645.5 614.5
5,100 649.2 630.4
5,200 653.2 646.7
5,300 656.8 662.8
5,400 658.3 676.9
5,500 657.8 688.8
5,600 656.0 699.5
5,700 653.8 709.6
5,800 651.8 719.8
5,900 650.2 730.5
6,000 648.1 740.4
6,100 644.9 749.1
6,200 641.2 756.9
6,300 637.7 764.9
6,400 633.3 771.7
6,500 627.6 776.7
6,600 619.1 778.0
6,700 611.5 780.1
6,800 602.2 779.7
6,900 593.2 779.3
7,000 583.8 778.1
Average torque 623
Average power 625


Sources
Air Flow Research
877.892.8844
airflowresearch.com ARP
800.826.3045
arp-bolts.com
Comp Cams
800.999.853
compcams.com Edelbrock Corp.
310.781.222
edelbrock.com
Fel-Pro
248.354.7700
federal-mogul.com Holley
270.782.2900
holley.com
King Engine Bearings
973.857.0705
kingbearings.com Lunati
662.892.1500
lunaticams.com
Milodon
805.577.5950
milodon.com MSD
915-857-5200
msdigntion.com
Westech Performance Group
951.685.4767
westechperformance.com Wiseco
440.951.6600
wiseco.com
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Re: lunati 496 BBC engine build-up

Postby filmjay » April 2nd, 2009, 6:16 am

This is what you should do to that recently acquired 454. :)
Image
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Re: lunati 496 BBC engine build-up

Postby grumpyvette » April 16th, 2011, 1:23 pm

IVE built at least a dozen 489-496 bbc strokers and the longer 6.385" rods, vs the stock 6.135" rod length and larger counter weights on the 6.385" combo make the whole deal easier to clearance and balance,Ive always preferred a tall deck 427 block over a production 454 block, the problem is both in initial cost and transporting it once you find one and have it purchased in most cases, if your local ID swap a short deck 454 block for a tall deck 427 block in less than a heartbeat, as I find they are significantly better blocks to build a 496 stroker with, but it hardly makes sense to spend a great deal of time and effort if the cost factor becomes a burden, your better off with a DART aftermarket block with its larger bore and thicker casting and a block thats not 30-40 years old,at some point, that you can easily use to build a 540 bbc,and that points a lot lower cash value than most people realize

yes it possible to use the standard rods but their fairly short at 6.135" and counterweights clear the piston skirts far better with the slightly longer 6.385"rod length
most effective combos have about a 10:1-10.5:1 cpr ( for street strip engines) and a cam with a reasonably tight 106-108 LSA and lift over .600 and duration in the 245-260@ .050 plus range.
Id suggest keeping the dynamic compression around 8:1 for a street driven car intended to operate on pump high test gas and keep the coolant temps under 190F, so get a high capacity water pump and a decent large radiator, because with the extra hp you generate more heat!
you can obviously boost the compression ratio and go with a more radical cam duration on a race engine where street manors play less importance than brute power
obviously your parts selection needs to match the application and gearing, but a 489-496 has a great deal of potential, basically the bore and stroke are similar and the resulting displacement size makes the better flowing large oval port (280-290cc) (best for street)and smaller rectangle port heads (305-325cc)(better on a more radical combo) with a decent intake and roller cam really work well. and the piston speed maxes out at or below the rpm range (6000rpm-6500rpm) where really expensive valve train mods are usually required, most 496 BBC engine get by just fine with good heads, roller rockers and a rocker stud girdle.
be aware that not all oil pans clear the longer stroke and in an ideal world you'll have a BAFFLED 7-8 quart oil capacity, a windage screen and an oil cooler on the car.
Image
Image

Image
after reading thru the thread Id just want to state a few points

(1) software dynos can be useful but don,t even think the actual predicted hp/tq numbers will be exactly accurate

(2) no hydraulic roller cam in my experience is worth a damn over about 6400rpm compared to a decent solid roller cam, but on a street car mid range torque is far more useful

(3) guys commonly make the mistake on big blocks of selecting a 112-114 LSA ,with a good deal of duration, big blocks are UNDER VALVED, and a tighter 106-108 LSA and slightly less total duration almost always works better

(4) try and get your dynamic compression in the 8:1 range and your quench down in the .038-.044 range

(5) on a 468-496 bbc a 290cc oval port heads fine on a 540 Id be inclined to select a 315-335 cc port head,.

(6)both the intake and header design have a very pronounced effect on your effective head and runner flow rates, a tighter LSA can benefit from the more efficient flow during overlap

(7) a strong ignition and controlling both the advance curve and fuel/air ratio is critical.
READ THESE


viewtopic.php?f=53&t=5563&p=16836#p16836

viewtopic.php?f=69&t=170

viewtopic.php?f=57&t=4701

viewtopic.php?f=69&t=3153

http://maliburacing.com/patrick_budd_article.htm

viewtopic.php?f=54&t=64

viewtopic.php?f=52&t=319

viewtopic.php?f=54&t=2187

viewtopic.php?f=54&t=4576
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Re: lunati 496 BBC engine build-up

Postby grumpyvette » December 2nd, 2011, 2:57 pm

here are the details of this build.

Image
496 4 Bolt Main,
10.2 comp,
Mahle custom modified dome pistons,
.238 @ .050 hyd roller,
"probably similar to this
ERSE119849-47
specs>> 3000-6000 298°/306° 238°/246° .548"/.548" .584"/.584" 108° "

AFR 265 heads, http://www.airflowresearch.com/index.php?cPath=68_111
RPM air gap intake.
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Posts: 14105
Joined: September 14th, 2008, 1:40 pm
Location: florida

Re: lunati 496 BBC engine build-up

Postby grumpyvette » May 1st, 2012, 4:47 pm

HEY GRUMPY, HOW DO I CHANGE MY 454 into a 496, what parts are required?


if your planing on building a 496 which is basically the big block version of a small block 383, its done by swapping to a .25" longer stroke crank , 6.385" connecting rods (which are .250" longer than the stock 6.135" rods) and using .060 over bore pistons.
Ive always preferred a tall deck 427 block over a production 454 block, the problem is both in initial cost and transporting it once you find one and have it purchased in most cases, if your local ID swap a short deck 454 block for a tall deck 427 block in less than a heartbeat, as I find they are significantly better blocks to build a 496 stroker with, but it hardly makes sense to spend a great deal of time and effort if the cost factor becomes a burden, your better off with a DART aftermarket block with its larger bore and thicker casting and a block thats not 30-40 years old,at some point, that you can easily use to build a 540 bbc,and that points a lot lower cash value than most people realize

a stock 454 has a 4.251" bore and 4" stroke and uses 6.135" connecting rods
a 496 stroker uses a 4.25" stroke crank, USUALLY 6.385" connecting rods to clear the larger crank counter weights and a .060 over bore piston at 4.310" bore
you calculate displacement
bore x bore x stroke x number of cylinders x .7854= displacement
4.31 x 4.31 x 4.25 x 8 x .7854=496

youll also find that the larger displacement and longer stroke tends to favor a slightly tighter LSA and about 10 degrees more duration than a similar 454 would use.
for hot street use, in lighter weight cars like camaros and novas with manual transmissions Ive had good results with a the 250-260 duration cams on 106-110 LSA and either large oval port or small rectangular port heads
obviously compression and rear gear ratio must match the combo used


READ THRU THESE THREADS AND SUB LINKS


viewtopic.php?f=69&t=6132

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viewtopic.php?f=53&t=204

viewtopic.php?f=52&t=181

viewtopic.php?f=52&t=90

viewtopic.php?f=54&t=2187
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Site Admin
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Posts: 14105
Joined: September 14th, 2008, 1:40 pm
Location: florida


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