LS1 bore = 3.898"; Lunati stroker bore = 3.903 - WTF?
#1
TECH Veteran
Thread Starter
Join Date: Aug 2002
Location: Hartsdale, NY
Posts: 4,055
Likes: 0
Received 0 Likes
on
0 Posts
LS1 bore = 3.898"; Lunati stroker bore = 3.903 - WTF?
Can someone please help with my confusion; I thought I could order a new LS1 aluminum block and Lunati rotating assembly and avoid all machine costs?
The dementions of a new LS1 stock engine block are 3.898 inches, right?
The dementions of the bore for a Lunati stroker kit are listed as 3.903, right?
Dumb question #1: I assume that Lunati assumes that you have a used block that will be cleaned up to match their bigger pistion size?
Dumb question #2: I assume the piston has to be a tad smaller than the bore; does Lunati's measurement refer to their piston size or are they telling you how much your bore should measure to match their piston set?
Dumb question #3: When I order my new block will it have a finish hone of 3.898 inches or do they ship it with a smaller bore which means you have to incurr machining costs to get it to a finished hone state?
Is this a vast right-wing conspiracy to help the machinsts generate engine block honing business?
Thanks...
The dementions of a new LS1 stock engine block are 3.898 inches, right?
The dementions of the bore for a Lunati stroker kit are listed as 3.903, right?
Dumb question #1: I assume that Lunati assumes that you have a used block that will be cleaned up to match their bigger pistion size?
Dumb question #2: I assume the piston has to be a tad smaller than the bore; does Lunati's measurement refer to their piston size or are they telling you how much your bore should measure to match their piston set?
Dumb question #3: When I order my new block will it have a finish hone of 3.898 inches or do they ship it with a smaller bore which means you have to incurr machining costs to get it to a finished hone state?
Is this a vast right-wing conspiracy to help the machinsts generate engine block honing business?
Thanks...
#2
TECH Veteran
iTrader: (6)
Re: LS1 bore = 3.898"; Lunati stroker bore = 3.903 - WTF?
Is this a vast right-wing conspiracy to help the machinsts generate engine block honing business?
1) 3.903 is a 0.005" overbore (standard clean up) and is done because "most" people out in the world are going to use the block they already have in the car (ex: 50K miles) so it will need a little cleaning.....
2) I "think" pistons are a few thousandths smaller than the bore and the rings make the difference (ex: 3.900 piston)....Lunati is telling you the kit is designed to work with a 0.005" overbore.....
3) The blocks that come from GM should already be honed to a stock bore and be ready for stock pistons to be installed......in the SDPC2000 catalog, the add for the LS1/LS6 block says "This block comes with a 3.898" bore and will accept up to a 4.000" stroke without any machining of the block."
Can I ask why your not just using the block you have in the car now? A 0.005" clean up will not cost you NEAR what the new block will and you will actually have a better engine (seasoned block).
#6
TECH Veteran
Thread Starter
Join Date: Aug 2002
Location: Hartsdale, NY
Posts: 4,055
Likes: 0
Received 0 Likes
on
0 Posts
Re: LS1 bore = 3.898
Camaro Guy:
I will likley buy a new block since I have a complete extra top end from my H/C swap and I could sell the old complete engine for $2,500 or so ...after my stroker project is complete....
I will likley buy a new block since I have a complete extra top end from my H/C swap and I could sell the old complete engine for $2,500 or so ...after my stroker project is complete....
#7
11 Second Truck Club
iTrader: (2)
Join Date: Jan 2002
Location: Missouri
Posts: 1,412
Likes: 0
Received 0 Likes
on
0 Posts
Re: LS1 bore = 3.898
I just ruined a set of custom diamond pistons and now I am going to have to bore .030 I put a set of 4.00 pistons in a stock bore 6 liter with only the cleanup of a brush hone. I didn't measure the piston to bore clearance-just assumed it would be OK. I guess the hyper pistons used tighter clearances than forged. Lesson learned, I guess.
Trending Topics
#9
Launching!
Join Date: Sep 2002
Location: Clinton Twp. Mi
Posts: 297
Likes: 0
Received 0 Likes
on
0 Posts
Re: LS1 bore = 3.898
L-EATER, What exactly happened with your engine? Give me a call and I might be able to help you out. Just matters what you had happen, I am sure I can at least help you out in some way.
Thanks,
Chris Gelineau
Diamond Pistons
877-552-2112 toll free
Thanks,
Chris Gelineau
Diamond Pistons
877-552-2112 toll free