Questions on torque specs and head swap, please help

[94Pro-5.0]

I'm about to bolt on my TFS heads. I have all of the gasket areas cleaned and all holes tapped. I'm using 7/16 ARP headstuds, TFS washers, and TFS Premuim o-ring gasket set. What torque specs do I use and what order do i go in (if thats important). Is there anything else i should be aware of before i do this? i want to make sure i do it right the first time.

quick help will be appreciated, i'm trying to get this done tonight or tomorrow morning. thanks guys

 

[OnyxCobra]

Here's how I did mine:

--Step 1 25-35 ft/lbs
--Step 2 45-55 ft/lbs
--Step 3 75-85 ft/lbs

For step 3 i torqued them all to 80 and then did the long ones to 90 lbs.

as for the order:

 

[Paul]

I have nothing to add here other than to say OnyxCobra is exactly right. Don't forget the moly lube.

 

[94Pro-5.0]

This is how a buddy said i should do it




also, why do you torque the longer bolts more? i havent heard that before... :dunno:

thanks for th help guys

 

[OnyxCobra]

I wouldn't listen to ur buddy, you definitely go from the inside outwards. it's the lower intake manifold bolt sequence that goes all over the place.


After like 2 days of pounding my head on the desk and looking at AFR torque specs, ARP stud torque specs with/without lube, etc. i decided to go with what it said about bolting down the long ones 10lbs more. Have had zero problems since the install *knocks on wood*

 

[Paul]

According to my machinist friend, the longer bolts are torqued tighter since they have more length and are more likely to absorb the torque by "twisting".

It is a generally accepted practice, and I did it on the motor I just built.

Paul.

 

[94Pro-5.0]

cool thanks guys

i called trick flow today (surpirsed they dont know me by name lol) and he said to go 80lbs on the long ones and 70lbs on the short ones. he said any more than that is too much for their heads

 

[OnyxCobra]

definitely listen to the manufacturer, but if it messes up make sure you call and ream them out.

 

[ryclef331]

The "sequence" you posted is correct in the picture. I go 25lbs through the sequence, 50, through the sequence, then 70 through the sequence. finish up with 1,3,5,7,9 (according to your pic) at 80 across the top ones