502 Mag MPI plenum bolt torque?
 

Does anyone know the correct plenum to intake torque on the torx bolts for a 502 or 454 mag?

Re: bolt torque?
 

OK, the intake to cylinder head bolts are as follows...

the lower intake bolts get torqued to 124 inch lbs....
the the long intake bolts get torqued to 30 ft lbs....
and the plenum bolts get torqued to 159 inch lbs on a 454 MPI and 150 inch lbs on 454/502 MAG MPI's as well as 8.2 MPI's.

John

Re: bolt torque?
 

Perfect. Thanks.

Re: bolt torque?
 

How about the torque for rocker arm bolts?
And exhaust bolts when going to GLM Aluminum parts?

Re: bolt torque?
 

Joe .. Thanks for the informative comment.
I have NON adjustable Hydraulic Roller 502 MPI
Looking at your tag line I would think that might have come to mind :cool:

Re: bolt torque?
 

sorry I wanst paying attn....... 1997 and older rockers are 45 lbs 1998 and newer are 40lbs

again sorry for the mistake

Re: bolt torque?
 

Thank you .. I searched but did not see it anywhere
Thanks again for the help
Wayne

Re: bolt torque?
 

Thanks again guys .. Just torqued the last bolt on the plenum...So after work tomorrow me and my trusty fire extinguisher :evilb: will try to start the 502 up :drink:

Re: bolt torque?
 

Ok guys .....what gives ? Just Today I stripped 2 of the short intake Manifold Bolts ....My book ....Mercruiser Manual 23 ...sez for 502/454 MPI ....35LBs !!! On the next page for a 7.4 MPI sez 30lbs .... ???????

Re: bolt torque?
 

Well, first off I am sorry to hear that you had a problem. Second I hope you read the reply as it says inch pounds verses foot pounds. Most torque wrenches have a conversion on it for inch to foot pounds. What was stated is from a Mercury manual.

John S.