5.7 MERCRUISER 5.7 Help

[juskol18]

I recently had to remove the heads to do a valve job and the heads resurfaced. Now I need to put it all back together and I can't find the proper torque specs for the heads and intake or the proper pattern. These are the numbers I have found on the block, V0522TRA and CKF180252

 

[alldodge]

I recently had to remove the heads to do a valve job and the heads resurfaced. Now I need to put it all back together and I can't find the proper torque specs for the heads and intake or the proper pattern. These are the numbers I have found on the block, V0522TRA and CKF180252

:welcome: to iboats

Those numbers cannot be used. Casting numbers in most cases are on the rear deck just below where the head is.
What year is the engine?

 

[juskol18]

I just went and looked again the only numbers I could find were on the back and they read GM 5.7lg SGI. It is a 1998 boat so I assumed it would be the same year motor.

 

[Bt Doctur]

How many bolts are in the intake manifold?

Chevy SB heads should all have the same pattern starting with the center bolt and going in a clockwise fashion in 3 steps.
Torque -to- Yield use a different process,

 

[Bt Doctur]

or go 20, 50, 75 Ft/Lbs

 

[juskol18]

THE NUMBERS ON THE HEADS ARE GM 4102193 WHICH ARE HEADS OFF A CHEVY 350 SO I'M THINKING SOMEONE HAS CHANGED THE MOTOR OUT AND PUT ALL THE MARINE COMPONENTS ON TOP. WITH WHAT I HAVE RESEARCHED THE HEADS SHOULD BE TORQUED TO 65 FT/LBS IN THE STEPS STARTING WITH 25-45-65? PLEASE CORRECT ME IF I AM WRONG?

 

[Bt Doctur]

directly above the starter should be a aluminum plate with numbers on it, post those

 

[Scott Danforth]

THE NUMBERS ON THE HEADS ARE GM 4102193 WHICH ARE HEADS OFF A CHEVY 350 SO I'M THINKING SOMEONE HAS CHANGED THE MOTOR OUT AND PUT ALL THE MARINE COMPONENTS ON TOP. WITH WHAT I HAVE RESEARCHED THE HEADS SHOULD BE TORQUED TO 65 FT/LBS IN THE STEPS STARTING WITH 25-45-65? PLEASE CORRECT ME IF I AM WRONG?

you do not have to YELL.

fyi, your Mercruiser block, heads, and rotating assembly are GM (Chevrolet). Mercuiser purchases the longblock from GM powertrain and adds their marinization to it.

 

[Bondo]

HEADS SHOULD BE TORQUED TO 65 FT/LBS IN THE STEPS STARTING WITH 25-45-65?

Ayuh,..... Welcome Aboard,..... That'll work,.... Thought I usually use the numbers BD lists in post #5,.....

 

[juskol18]

I didnt find any plate above the starter but the intake has 12 bolts!

 

[Bondo]

It is a 1998 boat

Ayuh,..... Intakes went to 8 bolts in '96,.... you've just got pre-Vortec heads,....

 

[Bt Doctur]

that tells me its not a Vortec motor so I`ll get a pic

 

[Bt Doctur]

30 Ft/Lbs

 

[juskol18]

Thank you BD! So since it is pre-Vortec do I still need to torque the heads to the specs y'all gave?

 

[juskol18]

Ok I have got the heads on! Does anyone have a diagram of the intake and where all the bolts and brackets go?? I can't remember it's been so long..

 

[alldodge]

Will this help

 

[juskol18]

I really need a picture of the top so that I can see how all the throttle linkage and etc hook up...