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Best Block?
#1

Is there a 2.3 block that is stonger and better to use for a high hp build? What crank to use when building a 2.5l?
-Peder Beckman-
Technical Director
American Iron Racing
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#2

Yeah, the SVO tall deck block, but i wish you the best of luck finding one. :crazy:
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#3

finding one is one thing..paying for it is another :eek:
Function before form. Going fast is looking good!
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#4

If you want to build a 2.5, then use a late model, small journal block thru 1994. With the small main journal, you can use the crank out of a 2.5 Ranger engine and the blocks actualy have more material around the bottom of the cylinders and around the main bearings than a turbo block.

You can do a search for engine blocks and 2.5 strokers for more info.
Lon
1985.5 SVO
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#5

Quote: With the small main journal, you can use the crank out of a 2.5 Ranger engine and the blocks actualy have more material around the bottom of the cylinders and around the main bearings than a turbo block.
This is complete BS!! The newer small journal blocks have thinner cylinder walls. I have personally measure 2 of them (after cracking one under boost) and J.D. has measured quite a few (forget the exact number) and all of the small journal blocks had thin spots in the cylinder wall.

They are probobly OK for a low HP turbo application, but I wouldn't push the envalope with one.

Tim
XR4X4Ti
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#6

Search for JD Laramee's post re: cylinder wall thickness. All the data is in there, but the gist is that the D4-D9s are pretty beefy and the E7-E8s are the thinnest. With each jounal having it's own main bearing, the block isn't a weak point until you're making more power than Clay or Greg.
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#7

Quote:Originally posted by bendutro:
the block isn't a weak point until you're making more power than Clay or Greg.
none :dunno: lol..jp guys
Function before form. Going fast is looking good!
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#8

I used a NOS 92 block for my stock bore 2.5l.... Without boring the DP-DIS block should be fine. I have a stock bore with a 2.5l crank. This is for street use, but I run 19 PSI and soon to be higher with a t3/t4. However, if you plan on a LOT of track time, 22 PSI or more and Over Bore....you should use the turbo block with bearing spacers.

There is no need to use bearing spacers with the DIS block. Don't use the 95 and up block....beside being weaker, there to many odds & end that don't match up in a earlier car...like PS pump, Alternater bracket, motor mount.... The 88-94 DIS block drops right in an early car...TC or stang...

jk
70Mach1 351C4V-bigHP,88TC garaged,87TC 2.5LDPDIS 90mmMAF65mmTB LA3/Tuner Ported OSvalves T3/4 3"DP ATR Crane 57# AWIC/ICE Boxed
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#9

Quote:Originally posted by xr4x4ti:
Quote: With the small main journal, you can use the crank out of a 2.5 Ranger engine and the blocks actualy have more material around the bottom of the cylinders and around the main bearings than a turbo block.
This is complete BS!! The newer

Tim
XR4X4Ti
What ever....... I hade my '92 block checked out by a very repudable high speed shop (they have been building drag and land speed motors for 40 years) and they compared it to a bare block out of an SVO and I got my info from them. The same type of info has been seen around here for a number of years.

So Bite Me..............
Lon
1985.5 SVO
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#10

Turboalpine posted a number of years ago that the later blocks are heavier, due to more mat'l around the main webs - so, actually, Lon was correct (TA didn't talk about cyl-wall thickness, BTW).

OTOH, Joe posted not too long ago that the turbo blocks are stronger than their N/A counterparts, due to higher nickel content.

Soooooo........if I were building an extremely-high output 2.3/2.5T motor, I'd probably opt for the turbo block, with its inherantly-thicker cyl walls and stronger mat'l. And, if I were gonna build it with a 2.5 crank, I'd use the late small-journal caps and have the block align-bored with spacers in the block.

But, I think the later blocks would probably hold up fine with some Hard Blok jacket filler, no matter what the boost. Just my 2¢. :dunno:

C'ya - RAY
Placerville, California
(former)  '78 2.3T Courier w/blow-thru Autolite 2bbl carb ~ (current)  '87 2.3T Ranger w/PiMP’d EFI
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