4" crank
08-31-2004, 08:42 PM
#2
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Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
If by 4" you mean the stroke, no, at least not logically.
2" (for the distance from the crank centerline to the rod journal) + 6" (connecting rod) + x (piston height) = 9.xxx deck height
Where "x" equals the piston height. You would need about a 1" compression height for a piston. Good like finding that for a good price. Also, the clearancing needed is a bit much.
Why would you even want a 4" stroke in a 305. Cost vs. output, the 305 is CLEARLY lacking versus the 350 block.
2" (for the distance from the crank centerline to the rod journal) + 6" (connecting rod) + x (piston height) = 9.xxx deck height
Where "x" equals the piston height. You would need about a 1" compression height for a piston. Good like finding that for a good price. Also, the clearancing needed is a bit much.
Why would you even want a 4" stroke in a 305. Cost vs. output, the 305 is CLEARLY lacking versus the 350 block.
Last edited by Stekman; 08-31-2004 at 08:46 PM.
08-31-2004, 09:02 PM
#3
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Car: 1990 iroc z
Engine: LSX 376 F1A
Transmission: 4l60e
Axle/Gears: 12 bolt 3.42
probaly because its way out of the ordnary and i want my car to have the orignal block it but it would be different. more powerful than a 335 or a 340. just trying to keep the same block. also i have a concerns about california smog and i know there is no law about substution for cubic inches. thanks for your help though.
08-31-2004, 09:05 PM
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Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
What is the budget for this project.
Keep in mind, pistons alone will be $600+ probably.
Oh yea, unless they check casting numbers and cross reference to the VIN, look at the outside of a 350. Then look at the outside of a 305. There is no difference.
Keep in mind, pistons alone will be $600+ probably.
Oh yea, unless they check casting numbers and cross reference to the VIN, look at the outside of a 350. Then look at the outside of a 305. There is no difference.
08-31-2004, 09:41 PM
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Car: '85 IROC
Engine: LB9
Transmission: 700 R4
There are special blocks designed to fit a 4" stroke. They have a raised camshaft for extra clearance and the oil pan rails are located further apart.
I guess some guys have used 4" stroke cranks in factory 350 blocks, but I wouldn't want to try it, cause it would be a very labor intensive project. Same thing for a 305 block.
I guess some guys have used 4" stroke cranks in factory 350 blocks, but I wouldn't want to try it, cause it would be a very labor intensive project. Same thing for a 305 block.
08-31-2004, 11:49 PM
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Car: 1990 iroc z
Engine: LSX 376 F1A
Transmission: 4l60e
Axle/Gears: 12 bolt 3.42
about 3500 and i just want to redo the bottom of the engine cause i already have edelbrock heads,intake,runners,and chip done to the car. but it sounds like it might have too much labor involved even though i pulling the engine myself.
09-01-2004, 04:42 AM
#7
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you'd be ahead to pull the engine if you're that worried about the numbers matching and buy a 350 block, or even a 400. reguardless it'll take a lot of specalized pieces to make a 4" stroke work in a SBC.
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09-01-2004, 11:08 AM
#8
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Car: 82 Z28
Engine: Al LT1 headed LG4 305
Transmission: TH350
Axle/Gears: 3.73 posi with spacer
Does anybody have pics of a 4" crank SBC? How about pics of the clearancing?
Last edited by ME Leigh; 09-01-2004 at 11:11 AM.
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