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03-16-2010, 07:41 AM
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#1
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Regular Member
Join Date: Aug 2008
Location: Weavervill, N.C.
Posts: 1,088
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Building an 8000 rpm LT1
Hey guys i picked up an iron head LT1 out of a Buick Roadmaster i think, not sure of the year yet, i want to build it with forged internals and maybe bore and stroke it a little, first LT1 build so any helpful advice would be nice, i do not have a horsepower range in mind yet as i am just now planning it. i would like to turn about 7500, to 8000 if possible.
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 2002 WS6
- 6.0, M6, 410 rear, LT's, magnaflow cat back, LS6 ported and polished stage 3 heads,LS6 intake,SLP 85 MM MAF, 85 mmTB, smooth bellows, 42 lb injectors, underdrive pulley,Walbro 90 PSI - 255 LPH F.P. CF air lid, K an N, TSP v2 cam, spec 3 clutch, heavy duty slave cylinder, race performer flywheel, MSD wires, Dyno tune,3 point SFC, UMI rear suspension, Drilled and Slotted Rotors, UMI ST brace other stuff i cant remember...lol 
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03-16-2010, 08:39 AM
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#2
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Regular Member
Join Date: Dec 2007
Location: Kouts, IN
Posts: 1,962
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The first thing that came to mind was the rpm restriction with a stock lt1 computer. The max you can have it tuned to is 7200-7250rpm. You're only choice would be a full stand alone engine mangement system. $$$$$
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August 2010 Car of The Month (93 z28) March 2013 Car of The Month (94 z28)
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03-16-2010, 08:52 AM
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#3
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Regular Member
Join Date: Aug 2008
Location: Weavervill, N.C.
Posts: 1,088
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ok, thats one piece of info i can use, thanks man, any other tips on the internals?
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2002 WS6
- 6.0, M6, 410 rear, LT's, magnaflow cat back, LS6 ported and polished stage 3 heads,LS6 intake,SLP 85 MM MAF, 85 mmTB, smooth bellows, 42 lb injectors, underdrive pulley,Walbro 90 PSI - 255 LPH F.P. CF air lid, K an N, TSP v2 cam, spec 3 clutch, heavy duty slave cylinder, race performer flywheel, MSD wires, Dyno tune,3 point SFC, UMI rear suspension, Drilled and Slotted Rotors, UMI ST brace other stuff i cant remember...lol
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03-16-2010, 09:01 AM
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#4
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Regular Member
Join Date: Dec 2007
Location: Kouts, IN
Posts: 1,962
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Use ARP bolts throughout. Get the mains splayed for 4 bolts. the stock crank and rods will do if you want to save some cash.
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August 2010 Car of The Month (93 z28) March 2013 Car of The Month (94 z28)
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03-16-2010, 09:18 AM
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#5
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Regular Member
Join Date: Aug 2008
Location: Pennsylvania
Posts: 360
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Quote:
Originally Posted by SlowAss93LT1
the stock crank and rods will do if you want to save some cash.
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To 8 Grand? Wheww... That's lean'n pretty hard on a lt1 bottom end I'd say.
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03-16-2010, 10:04 AM
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#6
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Regular Member
Join Date: Dec 2007
Location: Kouts, IN
Posts: 1,962
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Quote:
Originally Posted by 4Mesh
To 8 Grand? Wheww... That's lean'n pretty hard on a lt1 bottom end I'd say.
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He can't go to 8000rpm with the stock computer. It's limited to 7200rpm. I have ARP bolts holding the stock crank and pink rods together. Mine buzzes to 7200rpm quite nicely.
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August 2010 Car of The Month (93 z28) March 2013 Car of The Month (94 z28)
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03-16-2010, 10:20 AM
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#7
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Regular Member
Join Date: Aug 2008
Location: Weavervill, N.C.
Posts: 1,088
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8 grand was just a number i threw out there, no biggie, i just want to build a bullet proof bottom end! should i keep the iron heads or go alluminum? either way i am going to have them redone.
__________________
2002 WS6
- 6.0, M6, 410 rear, LT's, magnaflow cat back, LS6 ported and polished stage 3 heads,LS6 intake,SLP 85 MM MAF, 85 mmTB, smooth bellows, 42 lb injectors, underdrive pulley,Walbro 90 PSI - 255 LPH F.P. CF air lid, K an N, TSP v2 cam, spec 3 clutch, heavy duty slave cylinder, race performer flywheel, MSD wires, Dyno tune,3 point SFC, UMI rear suspension, Drilled and Slotted Rotors, UMI ST brace other stuff i cant remember...lol
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03-16-2010, 10:23 AM
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#8
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Regular Member
Join Date: Dec 2007
Location: Kouts, IN
Posts: 1,962
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Quote:
Originally Posted by Edward-T
8 grand was just a number i threw out there, no biggie, i just want to build a bullet proof bottom end! should i keep the iron heads or go alluminum? either way i am going to have them redone.
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Either or... Most of the time iron heads are used for monster nitrous and/or turbo applications.
Callies Crank - Oliver Rods - Diamond pistons = bullet proof/$$$$
__________________
August 2010 Car of The Month (93 z28) March 2013 Car of The Month (94 z28)
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03-16-2010, 10:30 AM
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#9
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I'm watching you....
Join Date: Sep 2006
Location: Little Rock, AR
Posts: 2,884
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The LT1 tables actually max out at 7000 rpm...but maybe with stock tach or shift extensions it appears more.
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03-16-2010, 10:47 AM
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#10
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Regular Member
Join Date: Dec 2007
Location: Kouts, IN
Posts: 1,962
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Quote:
Originally Posted by BLK WS6
The LT1 tables actually max out at 7000 rpm...but maybe with stock tach or shift extensions it appears more.
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My bad... PCMforless told me it was 7200.
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August 2010 Car of The Month (93 z28) March 2013 Car of The Month (94 z28)
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03-16-2010, 10:51 AM
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#11
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Regular Member
Join Date: Nov 2007
Location: Guatemala
Posts: 975
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well a nice 355 or 350 fully forged build, fully balanced, could handle it deplending on cam and heads choice,
another thing that would help is a spark trigger since the opti could fail pretty easy at those rpms, also another ecu like a mega squirt to go cheap would be nice and easy to hold it down.. making it a map sensored instead of maf will increase high rpm range,
well basically its pretty doable but, not cheap, and also why so many rpms? jmmmm
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Camaro from Guatemala 
1996 Camaro Z28 forged 385 A4-, match ported heads and manifold with 3 angle valve job, 52mm custom ported tb, cc503 cam, 1.6 ratio rockers, dual spring valves, lt1 edit, pacesetter long tubes, 3.73 gears, t/a push button, tb bypass, 2.5" true dual exhaust with H, 3k TC, ls1 home made intake, and going in a simple diet 
12.22@112mph on nittos 555rīs
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03-16-2010, 10:52 AM
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#12
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Cracka Lacka Boom!
Join Date: Jun 2009
Location: jersey shore
Posts: 5,494
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what are you building for? i doubt stock heads and intake will like 7k. you are looking at 10k plus to build this correctly. probably more like 15k with a stout drivetrain.
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Quote:
Originally Posted by ShowNoMercy
this is the internet, take it to seriously and you won't get out alive.
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03-16-2010, 11:00 AM
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#13
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Regular Member
Join Date: Dec 2007
Location: Kouts, IN
Posts: 1,962
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Quote:
Originally Posted by sweetbmxrider
you are looking at 10k plus to build this correctly.
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Exactly what I was thinking. a fully forged bullet proof motor is around $15k from start to finish.
__________________
August 2010 Car of The Month (93 z28) March 2013 Car of The Month (94 z28)
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03-16-2010, 11:13 AM
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#14
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Regular Member
Join Date: Aug 2008
Location: Weavervill, N.C.
Posts: 1,088
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just want a groundpounder. it doesnt have to be 8grand, 7 grand is fine, i already turn 63oo on the stock bottom with 146,000 miles with no issues so 7 grand shouldnt be to hard to do, just dont want anything coming lose and breaking. havent really decided yet, still working on that, the old motor was only 200 bucks.
__________________
2002 WS6
- 6.0, M6, 410 rear, LT's, magnaflow cat back, LS6 ported and polished stage 3 heads,LS6 intake,SLP 85 MM MAF, 85 mmTB, smooth bellows, 42 lb injectors, underdrive pulley,Walbro 90 PSI - 255 LPH F.P. CF air lid, K an N, TSP v2 cam, spec 3 clutch, heavy duty slave cylinder, race performer flywheel, MSD wires, Dyno tune,3 point SFC, UMI rear suspension, Drilled and Slotted Rotors, UMI ST brace other stuff i cant remember...lol
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03-16-2010, 04:01 PM
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#15
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Regular Member
Join Date: Dec 2007
Location: The Fiesta City
Posts: 1,903
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Quote:
Originally Posted by SlowAss93LT1
.......Callies Crank - Oliver Rods - Diamond pistons = bullet proof/$$$$
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Bares repeating!!!!!
In any case, unless you're going with a solid roller cam/valvetrain, getting the engine to rev that high means you have absolutely no bottom end ( low RPM) HP or torque.
KW
__________________
Black 1996 Impala SS, MTI 396ci, Ported AFR 210 Heads,
Competition Cam 236/242 Custom Grind
58mm TB, Clear Image 1 3/4" Quad-1 Headers with 3" Cut-outs, DynoMax 2.5" Cat-back
Yank 3600 stall TC, 4.10 gears
Bryan Herter tuning = 419 rwHP @ 6250 and 450 rwTQ @ 3750
SR 398ci in the works
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