Cubic Inches and block power
Cubic Inches and block power What kind of Hp can a sotck Lt1 block handle? (out of a 95Z) Also where can i find the formula or a way to figure out how to make a certain cubic in? I either want to do a 383 or prefer a 396? Can the stock block be made into a 396? Thanks
Teching In
Joined: Sep 2007
Posts: 47
Likes: 0
From: Minnesota
you can make a 396 lt1 but it will cost you alot more money than a 383. and all the supporting mods will cost you more too if you want to do it right. and as for the block they can handle quite a bit of power.
I think most guys are going 383 when they stroke the LT1.The power is close to the same as the 396 and less chance of hitting water also.
If you splay the mains and half fill the block the sky is pretty much the limit as far as rwhp prolly can go upto 1200-1500 or so
If you splay the mains and half fill the block the sky is pretty much the limit as far as rwhp prolly can go upto 1200-1500 or so
TECH Regular
Joined: Aug 2007
Posts: 418
Likes: 0
From: Cypress, TX
posted by "Injuneer" over in FormulaSource.com (hope you dont mind, Fred):
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Oct 8 2007, 10:03 PM
The typical "409" (408.18ci) is built with a 4.00" stroke and a 4.030" bore.
No problem with the bore. But the stroke makes life difficult. You will have
major clearance issues with the bottoms of the cylinder bores and the oil pan
rails. You will almost certainly need a small base circle cam. You will need a
huge oil pan. That's the reason you don't see too many LT1's larger than 396ci.
I've seen a guy build two different versions of a "421" on the LT1 block....
4.00" stroke x 4.090" bore (you need a hand-picked block, and will typically
need to get detailed cylinder wall measurements, so the bores can be
re-centered in the block to put the "meat" on the thrust side.)
4.125" x 4.030" bore (Let's just say 2 x the clearance issues of the 409).
I've also seen one person sleeve an LT1 block, to achieve a 427ci
displacement..... 4.00 stroke x 4.120" bore.
Anything over a 396 is not a cost effective solution. Even going to a 396
over a 383 is questionable. With a blower or turbos, you make 1,000+HP
with "only" 383ci..... how much more do you want?????
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Displacement calculator:
http://www.smokemup.com/auto_math/displacement.php
which is found in this list of calculators:
http://www.smokemup.com/auto_math/
another:
http://www.csgnetwork.com/cubicinchcalc.html
http://www.cbperformance.com/enginecalc.html
EDIT: Nice explanation (even if it is Ford specific)
http://www.fordmuscle.com/archives/2...ker/index2.php
