Hey whats up i no you dont remember me but i met you a couple of years ago at Kennedale, i talked to you about building a motor well anyway im trying to grt some info on building my new motor because of a broken crank.

Here is my plans:
All done to an 96 LT1 block
Eagle 4340 Forged crank 4.00 stroke(1 piece rear main seal)
Eagle H beam 6.0 rods
JE or SRP pistons bored .30 over (block is allready bored .30)
11 1/2 to 1 or 12 to 1 or maybe higher

Makes it a 408c.i

Here some Q's i got:

Will the 4.00 stroke work with out major modifications to the block, i know it will need some clearence cutting done but how much?

What oil pan? Is Canton the only choice?

Are the 4 bolt main caps needed? is it worth the money and machine work?

Would it be worth boring it .40 or .60 over for the extra c.i. the motor is bored .30 over now and it was built 300 miles ago and now the stock crank is broke.

Any more info or help would grately be appreciated
Lance

 

Well I am not Jordan, but i can tell you, there will have to be some work done to that block for a 4' stroke crank. You'll have to cut off half of the oil pan rail for the rods to clear. Not everyone is the same though, but you'll be breaking into water and have to get the block repaired for that. I believe that only splayed caps are the way to go for 4 bolts. The factory 4 bolts aren't really any stronger over 2 bolt blocks. I don't know if JE makes a piston to accomodate a 4" stroke crank. The wrist pin will be well into the ring area. A custom piston might be the best route. I think there is a company called BE, or something like that, that can make them. Canton is not your only choice. A lot of other pans will fit as long as you have long tubes.

But that's my opinion.

 

well i built the motor and the reason i came up with the broken crank is because i have a vibration between 3000 and 4000 rpms even with the converter unbolted and still there with a new fly wheel and changed the balancer with no belt on so it leaves some where in the middle like a broken or cracked crank or a broken piston skirt im running a Keith Black hyper pistons not the best or it can even be a lifter just dont know yet.

So im would like to build a stonger motor 396 or a 400+ c.i motor and just need some info!!

Whould it be better with a 3.875 stroke crank because from what i can remeber is Jordon was running that stroke and a .60 over bore comes to 401c.i motor

But the price diffrent between the two cranks are minimal just how much work and is there a piston avalible?

 

350ci = 349.848ci actual w/4.000" bore and 3.480" stroke (stock LT1)
5.700" rods & 3.999" dia pistons w/4.000" rings & 0.3" land
Compression ratio: 10.5:1 w/56cc chamber & 0.049" gasket

355ci = 355.115ci actual w/4.030" bore and 3.480" stroke
5.700" rods & 4.029" dia pistons w/4.030" rings & 0.3" land
Compression ratio: 10.9:1 w/54cc chamber & 0.049" gasket
Compression ratio: 10.8:1 w/55cc chamber & 0.049" gasket
Compression ratio: 10.6:1 w/56cc chamber & 0.049" gasket

357ci = 356.880ci actual w/4.040" bore and 3.480" stroke
5.700" rods & 4.039" dia pistons w/4.040" rings & 0.3" land
Compression ratio: 11.0:1 w/54cc chamber & 0.049" gasket
Compression ratio: 10.8:1 w/55cc chamber & 0.049" gasket
Compression ratio: 10.7:1 w/56cc chamber & 0.049" gasket

360ci = 360.422ci actual w/4.060" bore and 3.480" stroke
5.700" rods & 4.059" dia pistons w/4.060" rings & 0.3" land
Compression ratio: 11.1:1 w/54cc chamber & 0.049" gasket
Compression ratio: 10.9:1 w/55cc chamber & 0.049" gasket
Compression ratio: 10.8:1 w/56cc chamber & 0.049" gasket

377ci = 376.991ci actual w/4.000" bore and 3.750" stroke
5.700" rods & 3.999" dia pistons w/4.000" rings & 0.3" land or
6.000" rods & 3.999" dia pistons w/4.000" rings & 0.3" land
Compression ratio: 11.5:1 w/54cc chamber & 0.049" gasket
Compression ratio: 11.4:1 w/55cc chamber & 0.049" gasket
Compression ratio: 11.2:1 w/56cc chamber & 0.049" gasket
Compression ratio: 11.1:1 w/57cc chamber & 0.049" gasket

383ci = 382.667ci actual w/4.030" bore and 3.750" stroke
5.700" rods & 4.029" dia pistons w/4.030" rings & 0.3" land or
6.000" rods & 4.029" dia pistons w/4.030" rings & 0.3" land
Compression ratio: 11.7:1 w/54cc chamber & 0.049" gasket
Compression ratio: 11.5:1 w/55cc chamber & 0.049" gasket
Compression ratio: 11.4:1 w/56cc chamber & 0.049" gasket
Compression ratio: 11.3:1 w/57cc chamber & 0.049" gasket
Compression ratio: 11.1:1 w/58cc chamber & 0.049" gasket

Note: My motor with -16cc dished pistons, 0.039" gasket
and 56cc chamber should be about 9.8:1 to 10.2:1 CR

385ci = 384.569ci actual w/4.040" bore and 3.750" stroke
5.700" rods & 4.039" dia pistons w/4.040" rings & 0.3" land or
6.000" rods & 4.039" dia pistons w/4.040" rings & 0.3" land
Compression ratio: 11.7:1 w/54cc chamber & 0.049" gasket
Compression ratio: 11.6:1 w/55cc chamber & 0.049" gasket
Compression ratio: 11.4:1 w/56cc chamber & 0.049" gasket
Compression ratio: 11.3:1 w/57cc chamber & 0.049" gasket
Compression ratio: 11.2:1 w/58cc chamber & 0.049" gasket

388ci = 388.386ci actual w/4.060" bore and 3.750" stroke
5.700" rods & 4.059" dia pistons w/4.060" rings & 0.3" land or
6.000" rods & 4.059" dia pistons w/4.060" rings & 0.3" land
Compression ratio: 11.8:1 w/54cc chamber & 0.049" gasket
Compression ratio: 11.7:1 w/55cc chamber & 0.049" gasket
Compression ratio: 11.5:1 w/56cc chamber & 0.049" gasket
Compression ratio: 11.4:1 w/57cc chamber & 0.049" gasket
Compression ratio: 11.3:1 w/58cc chamber & 0.049" gasket

395ci = 395.423ci actual w/4.030" bore and 3.875" stroke
(396) 5.700" rods & 4.029" dia pistons w/4.030" rings & 0.3" land or
6.000" rods & 4.029" dia pistons w/4.030" rings & 0.3" land
Compression ratio: 12.0:1 w/54cc chamber & 0.049" gasket
Compression ratio: 11.9:1 w/55cc chamber & 0.049" gasket
Compression ratio: 11.7:1 w/56cc chamber & 0.049" gasket
Compression ratio: 11.6:1 w/57cc chamber & 0.049" gasket
Compression ratio: 11.5:1 w/58cc chamber & 0.049" gasket

397ci = 397.388ci actual w/4.040" bore and 3.875" stroke
5.700" rods & 4.039" dia pistons w/4.040" rings & 0.3" land or
6.000" rods & 4.039" dia pistons w/4.040" rings & 0.3" land
Compression ratio: 12.1:1 w/54cc chamber & 0.049" gasket
Compression ratio: 11.9:1 w/55cc chamber & 0.049" gasket
Compression ratio: 11.8:1 w/56cc chamber & 0.049" gasket
Compression ratio: 11.6:1 w/57cc chamber & 0.049" gasket
Compression ratio: 11.5:1 w/58cc chamber & 0.049" gasket

401ci = 401.332ci actual w/4.060" bore and 3.875" stroke
5.700" rods & 4.059" dia pistons w/4.060" rings & 0.3" land or
6.000" rods & 4.059" dia pistons w/4.060" rings & 0.3" land
Compression ratio: 12.2:1 w/54cc chamber & 0.049" gasket
Compression ratio: 12.0:1 w/55cc chamber & 0.049" gasket
Compression ratio: 11.9:1 w/56cc chamber & 0.049" gasket
Compression ratio: 11.8:1 w/57cc chamber & 0.049" gasket


That should give ou some idea