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you can see plainly in the last picture the joint where the runner bellmouth is. i can only assume that this is where the top shell meets the middle shell.
you can also see the joints were the runners meet the bottom shell in the first two pictures.
i think it is a vibration welded 3-piece.
i'm not about to cut it open to be sure. hopefully someone else is braver than i am.
I dunno, those look like a little work with a tootsie roll would smooth things out nicely, the step open up to the heads as opposed to causing a turbulence point?
I might grab one of these to replace my LS1 intake on the 99 SS i just bought. The EGR plug is horrendous though, definetely needs a black coated freeze plug.
maybe someone with more experience with how the original FAST 78 looked unported can chime in. having had a ported FAST 90 and currently a 102 i wouldn't have thought the ports looked like that.
I Googled some FAST 92 pictures (Looked for 78/90 pics and couldn't find good ones) to compare to the pics posted of the Dorman intake. Some of the best ones are of a Vengeances ported 92.
^^^ported FAST92
^^^Dorman 615-900
^^^Stock FAST 92
^^^Dorman 615-900
^^^Smoothed and painted FAST 92
^^^Dorman 615-900
From looking at these pictures I'd say the Dorman intake really is just a cheap copy of a FAST 78 and probably within 5 hp of a real FAST 78. Yes it could benefit from some porting but no more so that a FAST. Now the only thing keeping me from buying it is being poor.
they do look very close looking at those pics. the top shell looks different, though. dorman may have used the bottom and mid but designed their own top shell.
the "wedge" on the side of the port looks larger on the dorman part, and i'm not sure if that large hump on the top of the port is there on the FAST 78/90 like it is on the dorman. those are just judging from the pictures...
Originally Posted by Fry_
I Googled some FAST 92 pictures (Looked for 78/90 pics and couldn't find good ones) to compare to the pics posted of the Dorman intake. Some of the best ones are of a Vengeances ported 92.
^^^ported FAST92
^^^Dorman 615-900
^^^Stock FAST 92
^^^Dorman 615-900
^^^Smoothed and painted FAST 92
^^^Dorman 615-900
From looking at these pictures I'd say the Dorman intake really is just a cheap copy of a FAST 78 and probably within 5 hp of a real FAST 78. Yes it could benefit from some porting but no more so that a FAST. Now the only thing keeping me from buying it is being poor.
not wanting to sound like an authority on the subject, and i really wish i had an older FAST design in front of me to compare, but this is the best pic i could dig up of a "stock" port on a FAST 90:
that hump on the top of the port that is on the dorman where the upper shell meets the middle and lower shells doesn't seem to be there on the fast. the fast seems pretty flush.
i hope someone can come up with a better picture to alleviate my concern here. it is a concern to me, as most of the runner airflow is supposedly at the larger radius of a runner. this is where runner shape should have the most impact on airflow
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