Intake manifold and true dual choices
12-27-2013, 09:36 PM
#21
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i would look for a fast 78. they are getting cheaper and can tap for egr. i bought one for $400 to use on my ls6 top end swap and only made 8whp or less on the dyno vs my stock ls1 intake. 78 fasts are same price as ls6s are going for and if you look up 78 vs 92 fast dyno gains... not much of a difference up to 6500rpms i think was where the 90mm started to make more power. they are not worth $900. unless you use aftermarket heads and big cam.
12-28-2013, 05:32 AM
#23
I had one originally on my Camaro. Replaced the LS6 with it, then eventually a 92. Again, the 78 is a great intake as well... Power is in the runners, not the size of the TB. Never had it dyno'd with the 78 but I definitely felt a bit of a "punch" in the midrange. Cured that "flat spot" I had around 4500.
12-30-2013, 06:06 PM
#24
they are old prob the first size... but work great. i noticed the extra bump... with 243 ls2 heads and 02-04 z06 cam on my 1998, going from the LS1 to FAST 78 i gained a solid 9-10 whp and 9-10wtq thru the entire RPM. this is pretty much exactly the same results or maybe 1-2whp/tq more than a LS6. but the FAST intake really is designed for high rpms... pretty much race app heads/cam. i wouldn't really waste my money on anything more than a LS6 intake really for a mild cam.
01-02-2014, 05:01 PM
#27
you will need to buy button head bolts as the stock hex bolts will NOT clear the bottom of a FAST intake... you will crack the intake if you tq it down with hex bolts. there are several write ups for this i would imagine. also, you will need the a newer style /ls6 coolant line and rear block offs.
01-02-2014, 10:05 PM
#28
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you will need to buy button head bolts as the stock hex bolts will NOT clear the bottom of a FAST intake... you will crack the intake if you tq it down with hex bolts. there are several write ups for this i would imagine. also, you will need the a newer style /ls6 coolant line and rear block offs.
