How are the LT1's stroked?
Thread Starter
On The Tree
Joined: May 2010
Posts: 155
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From: Vancouver,WA
How are the LT1's stroked? Meaning Iknow the SBC 400 crank is used in the early 383's. Whats used to achieve this in these engines? Is it just that? Not to many people know that i've talked to. Their mostly into older engines.
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Yep and the argument between which rod benefits what stroke has been beaten to death without any real proof as to which one is the real advantage for any given setup.
Thread Starter
On The Tree
Joined: May 2010
Posts: 155
Likes: 0
From: Vancouver,WA
Oh no I understand. I was just curious what was differant. Meaning that i knew the 400 crank was need to make the 350 a 383. Also that they used the standard 5.7 350 rod. Just wondered what it took in the lt1. It was just something I didnt really hear to much about. Just that it had been done.
Oh no I understand. I was just curious what was differant. Meaning that i knew the 400 crank was need to make the 350 a 383. Also that they used the standard 5.7 350 rod. Just wondered what it took in the lt1. It was just something I didnt really hear to much about. Just that it had been done.
Thread Starter
On The Tree
Joined: May 2010
Posts: 155
Likes: 0
From: Vancouver,WA
Ok so the crank that was recomended and a bore then? To bad that crank didnt come in anything. And the 400 one isnt the same correct? I never thought it was just want to back up my thought. We all know if we could find one for less than a full price we would. Thanks though...really!
LT1/SBC is all the same when it comes to the bottom end, except for 1/2 piece rear main seals.
355 - Stock 3.48 stroke, 0.030" overbore
383 - 3.75" stroke, 0.030" overbore
396 - 3.875" stroke, 0.030" overbore
5.7 or 6" rods are acceptable. There are a ton of pistons out there ready to go off-the-shelf for both rod lengths and your choice of stroke, and they give piston CC numbers and approximate compression ratios.
355 - Stock 3.48 stroke, 0.030" overbore
383 - 3.75" stroke, 0.030" overbore
396 - 3.875" stroke, 0.030" overbore
5.7 or 6" rods are acceptable. There are a ton of pistons out there ready to go off-the-shelf for both rod lengths and your choice of stroke, and they give piston CC numbers and approximate compression ratios.
if you really want to use a 400 crank go for and just get a matching 1-2 pc seal conversion for about $150 and a matching oil pan for another few hundo, or just buy the aftermarket crank. lol Sorry for sounding like an a$$ but to answer your question simply, the 1 pc rear main with either a 3.75", 3.85", or 4" stroke did not come in any engine from the factory to fit the lovely LT1. It's all aftermarket now-a-days. Seems like all the traditional skills have gone the wayside and everyone builds the same thing from the same guys. IMHO there is no experimentation anymore and no one is willing to try something else without proven results.
Thread Starter
On The Tree
Joined: May 2010
Posts: 155
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From: Vancouver,WA
Ok so aside from the obvious internals, what else would I have to do to complete this? Meaning TB, bigger injectors, etc? What kind of tune would I need or would be recommended? Like say would just a simple hand held hypertech work as example?
Your fuel and tuning requirements rely far more on the valvetrain than the overall displacement. The heads, cam, intake, and exhaust make the power, not the rotating assembly/displacement.