Malibu Engines

[carguy79ta]

yep the piston are aftermarket but we are talking SB Chevy here. the most common and inexpensive motor to work on ever.

not quite sure which question we are discussing. but..

30 minutes ago, 23LSVOwner said:

Correct, there are various rod lengths. You have to match the stroke on the crank to the rod length.

 

His question was if you could just change rods without changing the stroke.

if you change the rod lgt, you will have to get different piston so the rod lgt+piston pin height match up to block deck height.  ie. if you make the rod longer the piston has to be shorter.  this is the answer. but what is the question? (matrix?)

[MadMan]

21 minutes ago, carguy79ta said:

 we are talking SB Chevy here. the most common and inexpensive motor to work on ever.

This is absolutely true.  The 3.75" crankshaft in my boat was $189.

[carguy79ta]

1 hour ago, MadMan said:

This is absolutely true.  The 3.75" crankshaft in my boat was $189.

was it a forged piece by Eagle? or scat?

[MadMan]

14 minutes ago, carguy79ta said:

was it a forged piece by Eagle? or scat?

Eagle - cast, been in there 5 years.

[carguy79ta]

yep sounds like a bulletproof combo.

[MadMan]

On ‎3‎/‎6‎/‎2018 at 10:40 AM, carguy79ta said:

yep sounds like a bulletproof combo.

Probably don't need to go forged unless you are spinning >6k rpm.

[carguy79ta]

11 minutes ago, MadMan said:

Probably don't need to go forged unless you are spinning >6k rpm.

def true on a car but a boat..you could argue with your spouse that the extra load that the motor sees warrants the extra coin for the forged piece. don' know if boat motors now have forged cranks or not.  I know the LS3(car  motor) has a cast crank and guys put 600 to 800hp to them.

[MadMan]

3 hours ago, carguy79ta said:

def true on a car but a boat..you could argue with your spouse that the extra load that the motor sees warrants the extra coin for the forged piece. don' know if boat motors now have forged cranks or not.  I know the LS3(car  motor) has a cast crank and guys put 600 to 800hp to them.

My Monsoon came with a cast crank, cast pistons and 2 bolt main block.