290enticer

I have a pre mark v 7.4l that im putting heads back on. The clymer manual says 85lbs in 3 step for both long and short bolts....this seems like its not enough??? Does anyone have these specs? Thanks for the info!!

290enticer

come on guys..I know someone has been into these engines and knows the cylinder head torque spec......!!

Sunshadow

do what the book says. I've broken head bolts off with less than 85 lbs. It's not just the lbs its the streach of the bolt as well.

Donzinator

85 ft/lbs looks about right (that's what I torqued mine to).
Try this link: http://www.perfprotech.com/store/art...r-torques.aspx

290enticer

i got the heads back on today and boy they are heavy when your standing on your head...I can't believe that every head bolt goes into a water jacket...I figured it would be more solid that that. I sealed them all up good so hopefully i'll finish it tomorrow and get it running. Hope all is well!!

SHAWN DAVIS

I'm pretty sure the gm spec w factory bolts is 65 short and 75 long
arp bolts differ as well as studs, I have gone as high as 85 myself

Shorgasm

I just did my 4.3 and they where 20-40-65.

290enticer

wanted to have it back running this weekend, but the weather has other plans. did get alot done though..still have to put distributor in as well as shift bracket and carb. then hit the key! Maybe i can wrap it up after work this week. Want to hear the engine run again!!