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post #1 of 42 (permalink) Old 03-16-2010, 07:41 AM Thread Starter
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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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post #2 of 42 (permalink) Old 03-16-2010, 08:39 AM
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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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post #3 of 42 (permalink) Old 03-16-2010, 08:52 AM Thread Starter
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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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post #4 of 42 (permalink) Old 03-16-2010, 09:01 AM
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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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post #5 of 42 (permalink) Old 03-16-2010, 09:18 AM
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the stock crank and rods will do if you want to save some cash.
To 8 Grand? Wheww... That's lean'n pretty hard on a lt1 bottom end I'd say.
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post #6 of 42 (permalink) Old 03-16-2010, 10:04 AM
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To 8 Grand? Wheww... That's lean'n pretty hard on a lt1 bottom end I'd say.
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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post #7 of 42 (permalink) Old 03-16-2010, 10:20 AM Thread Starter
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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.

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post #8 of 42 (permalink) Old 03-16-2010, 10:23 AM
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Quote:
Originally Posted by Edward-T View Post
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.
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/$$$$

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post #9 of 42 (permalink) Old 03-16-2010, 10:30 AM
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The LT1 tables actually max out at 7000 rpm...but maybe with stock tach or shift extensions it appears more.


Tuning is for the birds...




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post #10 of 42 (permalink) Old 03-16-2010, 10:47 AM
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Quote:
Originally Posted by BLK WS6 View Post
The LT1 tables actually max out at 7000 rpm...but maybe with stock tach or shift extensions it appears more.
My bad... PCMforless told me it was 7200.

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post #11 of 42 (permalink) Old 03-16-2010, 10:51 AM
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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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post #12 of 42 (permalink) Old 03-16-2010, 10:52 AM
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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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post #13 of 42 (permalink) Old 03-16-2010, 11:00 AM
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Quote:
Originally Posted by sweetbmxrider View Post
you are looking at 10k plus to build this correctly.
Exactly what I was thinking. a fully forged bullet proof motor is around $15k from start to finish.

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post #14 of 42 (permalink) Old 03-16-2010, 11:13 AM Thread Starter
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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.

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post #15 of 42 (permalink) Old 03-16-2010, 04:01 PM
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Quote:
Originally Posted by SlowAss93LT1 View Post
.......Callies Crank - Oliver Rods - Diamond pistons = bullet proof/$$$$
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.

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