My 434 small block made 13 more hp with a 1" Super Sucker than no spacer on the Indy intake. It also helped balance the afr's from bank to bank. The guy that owns the engine shop that dynoed my engine says he sells a bunch of Super Suckers after guys see the difference on the dyno.
Yeah I can see that. We typically see 10 to 15 hp improvement from a 1" taper type spacer on a 600+ hp bracket type motor. Pretty cheap hp compared to some other tricks that guys pay big bucks for.
TrickFlow has some moderately priced tape spacers that work. Wilson stuff is expensive but lightweight. Summit carries some really cheap stuff that probably works just as well but doesn't last as long.