Hi what size bolt is used for my 1973 340 small block LA? My info shows it as a 5/16-18 but not sure of the length. I am not sure what headers I have but I think they are hookers.
Thanx
Thanx
Thanks for the response. So 5/16-18 x 3/4 and I plan to use those nifty Nord-Loc washers.3/4" seems to be the typical length with a 3/8" 6-pt hex head. Sometimes it can be more convenient to leave the studs in the end bolt holes because they go into the coolant. Just make sure the headers can move enough to slide off.
Or you can slip the headers in place, twist in a couple center bolts to hold them and the gasket in place and then seal and install the outside studs.3/4" seems to be the typical length with a 3/8" 6-pt hex head. Sometimes it can be more convenient to leave the studs in the end bolt holes because they go into the coolant. Just make sure the headers can move enough to slide off.
Is there a preference of the order for tightening? The headers are already in place but I am replacing the shity bolts that are there alteady (some not tight).Or you can slip the headers in place, twist in a couple center bolts to hold them and the gasket in place and then seal and install the outside studs.
Thanks for the response. So 5/16-18 x 3/4 and I plan to use those nifty Nord-Loc washers.
Is there a preference of the order for tightening? (some not tight).
Hey JD “Without draining the motor” ? I don’t understand that part.When you leave the end studs end with headers, once you get everything tightened down......you can saw the studs off so there are only 2 or 3 threads sticking out past the nut. That will make it easier to get the headers off without draining the motor.
I use the Indian head shellac the stuff works great!The end studs holes are drilled into the head coolant passages. If the studs come out and the coolant has not been drained below that level it will come out. If you remove these studs use Teflon tape or another sealant to prevent leaks on the end bolt holes on both heads.
Some aftermarket heads may not be drilled through to coolant but it is always best to check first.