Ken Blythen Posted October 29, 2017 Share Posted October 29, 2017 The 2-barrel intake on my 351W has some corrosion pitting around the water ports & possibly a crack; it has a casting # D9DE-9425-CB. I have access to an earlier intake with the casting # C90E-9425-F (apparently a cast iron Mustang/Mercury Cougar intake). Can anyone tell me if these two intakes will swap satisfactorily? I'm not worried about the early intake being non-EGR. On RockAuto, the gaskets listed for '69 & '79 have different part numbers. Thanks Link to comment Share on other sites More sharing options...
Ken Blythen Posted October 29, 2017 Author Share Posted October 29, 2017 Just discovered (thanks to Conanski) that the '69-'74 heads & intakes have different bolthole patterns around the cooling ports. Link to comment Share on other sites More sharing options...
Gary Lewis Posted October 29, 2017 Share Posted October 29, 2017 Just discovered (thanks to Conanski) that the '69-'74 heads & intakes have different bolthole patterns around the cooling ports. That would answer the question. Glad you found that. Link to comment Share on other sites More sharing options...
85lebaront2 Posted October 29, 2017 Share Posted October 29, 2017 That would answer the question. Glad you found that. From what I remember from the original Muscle Parts catalog, the later intake would work on the early heads (improved head for 289/302 was to use the 351 head as this was a 1969 catalog) difference was 4 more manifold bolts on the 69-74 heads, anything that covered those would work, but using an early manifold with bolt holes there would result in a massive water leak. A thought, if everything except the extra holes fits, tap and plug the holes. Link to comment Share on other sites More sharing options...
PetesPonies Posted October 29, 2017 Share Posted October 29, 2017 From what I remember from the original Muscle Parts catalog, the later intake would work on the early heads (improved head for 289/302 was to use the 351 head as this was a 1969 catalog) difference was 4 more manifold bolts on the 69-74 heads, anything that covered those would work, but using an early manifold with bolt holes there would result in a massive water leak. A thought, if everything except the extra holes fits, tap and plug the holes. THere were extra holes added...BUT all will still fit. Now you're in my wheel house :) Link to comment Share on other sites More sharing options...
Ken Blythen Posted October 30, 2017 Author Share Posted October 30, 2017 THere were extra holes added...BUT all will still fit. Now you're in my wheel house :) Thanks for the replies. If I did adapt this early manifold to fit, are there any downsides (other than weight).......like flow, height, etc? Link to comment Share on other sites More sharing options...
Gary Lewis Posted October 30, 2017 Share Posted October 30, 2017 Thanks for the replies. If I did adapt this early manifold to fit, are there any downsides (other than weight).......like flow, height, etc? I wish I knew. But it is pre-EGR I assume. Is that an issue for you? Link to comment Share on other sites More sharing options...
Ken Blythen Posted October 30, 2017 Author Share Posted October 30, 2017 I wish I knew. But it is pre-EGR I assume. Is that an issue for you? No, we have no emissions testing; I've already removed the EGR. The early intake would be slightly tidier, not having the EGR ports & a block off plate. Link to comment Share on other sites More sharing options...
Ken Blythen Posted November 17, 2017 Author Share Posted November 17, 2017 No, we have no emissions testing; I've already removed the EGR. The early intake would be slightly tidier, not having the EGR ports & a block off plate. Ex-Mustang cast iron intake installed! (It's a heavy sucker) I drilled, tapped & plugged the extra four bolt holes as per Bill's suggestion, & it fitted perfectly using gaskets for the later heads. This will be the end of the aluminium intake's corrosion/seeping problem. Thanks for the help! Link to comment Share on other sites More sharing options...
PetesPonies Posted November 18, 2017 Share Posted November 18, 2017 Ex-Mustang cast iron intake installed! (It's a heavy sucker) I drilled, tapped & plugged the extra four bolt holes as per Bill's suggestion, & it fitted perfectly using gaskets for the later heads. This will be the end of the aluminium intake's corrosion/seeping problem. Thanks for the help! When installing an intake manifold, aluminum or cast iron . . . . always wipe both surfaces and both sides of the gasket with RTV at the water ports. I used the word "wipe" because you don'r want a lot, but you want enough to make a seal. You must break the surface tension of the cleaned manifold and gasket. You put on RTV and move it around until you see that it is attaching to the surface. Then you must assemble quickly. This is easier seen that explained, but I never have leakage problems do it this way. Link to comment Share on other sites More sharing options...
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