I have read the previous postings on the subject but still have some questions.
First let me share some basic data.
This is a totally rebuilt 261 stock condition.
Engine circa 1959. First fired up a few weeks ago. Detected some high frequency shrills/whistling..... engine is sitting in frame with no sheet metal......access to components is still good at this point.
I sprayed starting fluid very close to the intake manifold.... both the center and front location created a noticeable increase in RPM. Will verify again with a propane torch and small rubber hose this weekend....(less chance of blowing up the barn).
Here are the questions.
Now that the engine has been up to 180 degrees for a few minutes can I just retorque the bolts or do I need to loosen and retighten...?
I intend to work from the center out during the tightening sequence. I have heard some conflicting torques values....ranging from a low 20 foot pounds to 45 pounds. What are the correct torque values...?
I also read about 3 consecutive tightening sequence after 3 consecutive warm up...... how tight will they be by the 3rd try...?
When I first installed my manifold on the newly rebuilt engine I chased all the thread holes in the head and.... used brand new grade 8 bolts... NOT STUDS..... I made sure the bolts woudl not bottom out and cut and grinded to fit....
Was that a NONO...??? would the proper studs insure a better fit...?
Also.... tending to overdo things..... I removed the locating studs which are found at the extreme end of the head and replaced with good old grade 8 bolts again. Some have indicated that this will this cause the exhaust manifold to stress and leak when it cycles cold to hot to cold to hot.....as it will lack room to expend properly.....Did I do another NONO???
When the mainfolds were first installed, I left the heat connection between the intake and exhaust loose.....tighten everything from center bolts outwards..... the four bolts of the heat chamber were snugged up tight after the intake and exhaust manifold were tightened.
When both manifold were set against a straight edge prior to installation they appeared very straight, not pitted on the contact surface and did not show evidence of being overmilled or ever milled/ground.
Seriously considering buying the previously recommended thick gasket "leak fixing kit"....
as anobody used it with success..... sounds like a good investment.....
Are there any special spells or "incantations" that must be said and washed down with beer when installing the manifolds....??? I will even consider witchcraft....
Thanks for your help guys.....!
Bob Carriere
