Stroke it or get head?

M

MADMAX

New Member
Grumpy,
If you were building a big block for a 6500lb mostly off road toy, and were going big block--Where would you put your money? A Scat cast stroker kit with some massaged 049's with 2.19/1.88's, or just stay with the bored 454 block and buy aftermarket steel heads. What I'm looking for is mega- torque and throttle response along with about a 5500 rpm engine. Planning 9.5-9.6 compression, at least if I was going with the 049's. Have not picked out camshaft yet, but definitely going hydraulic roller. Any input on the cam from you would also be appreciated. Have a Weiand "Action Plus" intake that I'm going to gasket match to heads, and factory GM BBC carb that's been reworked for off camber driving. Thanks ahead of time for any advice!
 
Welcome !
Grumpy does all the Big Block Chevy Tech , his Personal Favorite .

My only thought is you don't want to run out gasoline deep in the woods off roading. That has happened to my friends and me. High strung race engine not desired. Brute Torque is where its at.
BBC a Natural at that.
 
if it was mine Id message the 049 heads and go with a stroker kit with 6.385 scat rods and about a 10.2:1 compression

always accurately measure the crank main journals, and remember the crank and block bearing sizes on a 400 sbc and 350 smc are different as are the early 283-327 sbc
spacerbearing5a.jpg

http://www.maliburacing.com/patrick_budd_article.htm

bbcchar.png


Chevy V8 bore & stroke chart

CID BORE STROKE
262 = 3.671" x 3.10" (Gen. I, 5.7" rod)
265 = 3.750" x 3.00" ('55-'57 Gen.I, 5.7" rod)
265 = 3.750" x 3.00" ('94-'96 Gen.II, 4.3 liter V-8 "L99", 5.94" rod)
267 = 3.500" x 3.48" (Gen.I, 5.7" rod)
283 = 3.875" x 3.00" (Gen.I, 5.7" rod)
293 = 3.779" x 3.27" ('99-later, Gen.III, "LR4" 4.8 Liter Vortec, 6.278" rod)
302 = 4.000" x 3.00" (Gen.I, 5.7" rod)
305 = 3.736" x 3.48" (Gen.I, 5.7" rod)
307 = 3.875" x 3.25" (Gen.I, 5.7" rod)
325 = 3.779" x 3.622" ('99-later, Gen.III, "LM7", "LS4 front wheel drive V-8" 5.3 Liter Vortec, 6.098" rod)
327 = 4.000" x 3.25" (Gen.I, 5.7" rod)
345 = 3.893" x 3.622" ('97-later, Gen.III, "LS1", 6.098" rod)
350 = 4.000" x 3.48" (Gen.I, 5.7" rod)
350 = 4.000" x 3.48" ('96-'01, Gen. I, Vortec, 5.7" rod)
350 = 3.900" x 3.66" ('89-'95, "LT5", in "ZR1" Corvette 32-valve DOHC, 5.74" rod)
364 = 4.000" x 3.622" ('99-later, Gen.III, "LS2", "LQ4" 6.0 Liter Vortec, 6.098" rod)
376 = 4.065" x 3.622" (2007-later, Gen. IV, "L92", Cadillac Escalade, GMC Yukon)
383 = 4.000" x 3.80" ('00, "HT 383", Gen.I truck crate motor, 5.7" rod)
400 = 4.125" x 3.75" (Gen.I, 5.565" rod)
427 = 4.125" x 4.00" (2006 Gen.IV, LS7 SBC, titanium rods)

Two common, non-factory smallblock combinations:

377 = 4.155" x 3.48" (5.7" or 6.00" rod)
400 block and a 350 crank with "spacer" main bearings
383 = 4.030" x 3.75" (5.565" or 5.7" or 6.0" rod)
350 block and a 400 crank, main bearing crank journals
cut to 350 size

ALL production big blocks used a 6.135" length rod.
CHEVY BIG BLOCK V-8 BORE AND STROKE


366T = 3.935" x 3.76"
396 = 4.096" x 3.76"
402 = 4.125" x 3.76"
427 = 4.250" x 3.76"
427T = 4.250" x 3.76"
454 = 4.250" x 4.00"
477= 4.5" bore x 3.76" stroke
496 = 4.250" x 4.37" (2001 Vortec 8100, 8.1 liter)
502 = 4.466" x 4.00"
557T= 4.5 bore 4.375" stroke
572T = 4.560" x 4.375" (2003 "ZZ572" crate motors)

T = Tall Deck

ALL production big blocks used a 6.135" length rod.
http://garage.grumpysperformance.com/index.php?threads/454-bbc-on-the-cheap-well-to-start.11739/

http://forum.grumpysperformance.com/viewtopic.php?f=53&t=341&p=417&hilit=stroker+tips#p417

http://forum.grumpysperformance.com/viewtopic.php?f=53&t=247&p=293&hilit=stroker#p293

http://garage.grumpysperformance.com/index.php?threads/another-496bbc.5123/

http://garage.grumpysperformance.co...ting-big-block-chevy-454-cam-dyno-test.10181/

http://garage.grumpysperformance.co...a-scat-rotating-assembly-be.11495/#post-52962

http://garage.grumpysperformance.co...-that-worked-a-bit-better-than-expected.9047/

http://garage.grumpysperformance.com/index.php?threads/lunati-496-bbc-engine-build-up.1420/

http://garage.grumpysperformance.com/index.php?threads/types-of-crankshaft-steel.204/

http://garage.grumpysperformance.com/index.php?threads/connecting-rod-strength-h-vs-i-beam.1168/

http://garage.grumpysperformance.com/index.php?threads/scat-cranks-related-info.10930/
 
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Thanks much for the info! Will I be able to get away with pump gas @ 10.2 to 1? A lot of the places I go don't even have premium fuel. Also, one of the cams I have looked at is a Howards hydraulic roller 219/227 @.050-.555 lift on both, 110 lsa & 106 intake centerline.
 
my calcs strongly suggest that if you build a stroked 454 (496) youll be best to try for about a max of near 9.5:1 static compression with that cam timing if your going to be consistently dealing with lower octane fuel.
 
Thanks Grumpy! I will take your advice. In your opinion, am I in the ball park as far as camshaft specs to get what I'm looking for?
 
this thread and its sub links contains a huge volume of related info, buying and reading the books listed would be a good investment,
for what your trying to accomplish Id use something like this in a hydraulic roller cam, get a decent air gap intake, pocket port those .049 heads, add a multi angle valve job, an use a 850 cfm vacuum secondary carb, low restriction exhaust, long tube 1 3/4" header have about 9.6:1 compression, in that 496 BBC, Id most likely use an auto trans with a 3000rpm stall speed converter, fairly large trans fluid cooler, with a powered fan and 3.73:1-4.11:1 rear gears

http://www.claysmithcams.com/bbc-454-to-470-cid-old-school-oem-049-781-heads-to-a-max-of-5700-rpm/

http://garage.grumpysperformance.com/index.php?threads/another-496bbc.5123/

THROAT.jpg

FINDING A DECENT BBC CAM ON A TIGHT LSA CAN BE A PROBLEM AT TIMES< HERES A FEW
http://www.claysmithcams.com/big-block-chevy-11/
 
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