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use a soldering iron to heat weld the crack
there are plenty of videos on the subject on google ---type in --how to weld plastic--- and watch the videos
or take it to a plastic/fiberglass repair shop
I would say that you used Holts because of a leaking head gasket. You should be fitting a new head gasket so there should be no need for the use of holts.
I hate to be a bearer of bad tidings. The 'bubbles' in the radiator indicate combustion gases are escaping the combustion chamber and into the coolant passages. The new head gasket my be leaking. The head may be cracked, There may be a hole in the head (caused by pitting corrosion on the water side. You might first try re-torquing the head bolts---a slim chance this will correct the situation, but quick and no cost. The head will need to be removed and carefully inspected and pressure tested to locate the leak. It can probably the repaired by welding. A 'head shop' will know just how to do it right. Aluminum heads must be pre-heated to at least 400F before the welding (TIG welding only) DO NOT 'mill the head' to correct any warping. If the warpage is too much (over about 0.030" in any direction) it can be straightened by heating to about 600 F and then clamping it tightly to a flat surface (it has to be FLAT to within 0.002 or less) to improve the warpage. After cooling, re-check the warpage. Repeat as necessary.
During inspecting try and determine how severe the corrosion in the water jacket has become. If extensive and severe, or deep pits, consider getting a used head. Sometimes pitting corrosion is caused by prolonged operation under light knocking (detonation), Another insidious cause is cavitation when the coolant boils on the metal surface --too low a pressure cap for the temperature and coolant mix.
cracked heads in aluminium can be repaired by welding. In cast iron heads they can be repaired by welding but depending on the condition of the material ( corroded-rusted) and contaminenants in the coolant the job is not always successful. In either case there will be necessary machining on the head and that generally makes the job dearer that a replacement head new or second hand
YES IT CAN BE WELDED UT IT NEEDS TO BE DONE AT A MACHINE SHOP THEY HAVE TO HEAT THE HEAD IN A FURNACE AND THEN WELD IT SO THE CRACK WON'T TRAVEL GET A NEW HEAD AND SAVE TIME AND MONEY GOOD LUCK
The Best And Easiest Way Is To Take the Head Off And Have Head Pressure Tested Welded Or Replaced Fit New Head Gasket And Repaired Replaced Head You Are Done.
It probably has a crack. Do like is done in some aircraft quality control things looking for cracks:
Make a solution, probably blue, with vegitable dye in water... fairly dark saturated solution. Dip the chime in it for a couple minutes and then drain. OFTEN you will see the dyed water draining out of the crack as a steam of blue if it is cracked. Repairing the cracks are iffy at best. You would need to find somebody with a MIG or TIG welder that can weld aluminum. After welding, the metal would have to be filed and dressed down close to the original profile.... Next one would use a tuner to file away slowly the added material to bring it into tune. Depending where the crack is, the welder may have to "vee" out the crack to get a solid fill of the crack.
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