Offenhauser 5489 Intake Install
I used the JB Weld High Heat epoxy which you knead by hand to smooth at the cut bushing. I also used it at other ports to smooth the slightly pitted surface, as shown. It becomes very hard so can be tapped and withstands 500 F so "should work". Strange that one coolant port doesn't align well with the metal intake gasket. Was the casting off? The Fel-pro gasket kit appears to be on for 273 engines (predates 318?) though box was open so perhaps I swapped gaskets long ago. I ran a coating of Permaseal Gasket Maker1 around each coolant port and coated bolt threads since the tapped holes are open to the crankcase. It is gummy and cleans up in ethanol, so seems like a thicker version of Permatex Gasket Sealant (purple goo) which might be butyl rubber. I didn't have the end gaskets, but unsure they are needed or even best. I ran a thick bead of the Permatex Ultra Grey shown. After torquing to 23 ft-lb, the gaps at the ends were very small and the sealant almost squashed out, so "should work".
Glad I bought Grade 8 bolts since that torque felt higher than expected for 5/16" bolts. I had to use temporary bolts at the front since didn't notice those must be longer. Felt like they would fail so stopped torquing at 20 ft-lbf and will swap to G8. Ditto for the coolant port bolts where I first used stainless bolts but felt like they were stretching so swapped to G8.
Sharp eyes will notice the glitch at the front bypass port. It is 3/8" NPT instead of the 1/2" NPT of the later Edelbrock intake I had on there (had to booger the mounting holes and use flat-head bolts). I made the mistake of using the later alum water pump which has a matching 1/2" outlet. To adapt, I used a 3/8" NPT-F to 1/2" copper tube adapter and 3/8" NPT-M nipple. The alum w.p. was to match the only radiator I could get at Autozone at the time long ago. Not a good path since causes many other issues - alum w.p. is 1" thicker so fan gets closer to radiator and pulleys no longer align, had to remark TDC on damper, no brackets for TRW p.s. pump so had to change to Federal, etc.
I used the JB Weld High Heat epoxy which you knead by hand to smooth at the cut bushing. I also used it at other ports to smooth the slightly pitted surface, as shown. It becomes very hard so can be tapped and withstands 500 F so "should work". Strange that one coolant port doesn't align well with the metal intake gasket. Was the casting off? The Fel-pro gasket kit appears to be on for 273 engines (predates 318?) though box was open so perhaps I swapped gaskets long ago. I ran a coating of Permaseal Gasket Maker1 around each coolant port and coated bolt threads since the tapped holes are open to the crankcase. It is gummy and cleans up in ethanol, so seems like a thicker version of Permatex Gasket Sealant (purple goo) which might be butyl rubber. I didn't have the end gaskets, but unsure they are needed or even best. I ran a thick bead of the Permatex Ultra Grey shown. After torquing to 23 ft-lb, the gaps at the ends were very small and the sealant almost squashed out, so "should work".
Glad I bought Grade 8 bolts since that torque felt higher than expected for 5/16" bolts. I had to use temporary bolts at the front since didn't notice those must be longer. Felt like they would fail so stopped torquing at 20 ft-lbf and will swap to G8. Ditto for the coolant port bolts where I first used stainless bolts but felt like they were stretching so swapped to G8.
Sharp eyes will notice the glitch at the front bypass port. It is 3/8" NPT instead of the 1/2" NPT of the later Edelbrock intake I had on there (had to booger the mounting holes and use flat-head bolts). I made the mistake of using the later alum water pump which has a matching 1/2" outlet. To adapt, I used a 3/8" NPT-F to 1/2" copper tube adapter and 3/8" NPT-M nipple. The alum w.p. was to match the only radiator I could get at Autozone at the time long ago. Not a good path since causes many other issues - alum w.p. is 1" thicker so fan gets closer to radiator and pulleys no longer align, had to remark TDC on damper, no brackets for TRW p.s. pump so had to change to Federal, etc.
