MakoLS1

61-300-111 Holley Aluminum LS1 intake manifold

The description says "LS1" intake, thats why I am wondering.

98Z28MASS

iTrader: (6)

It is as LS6 style manifold, however I had the same question as you and the results were overwhelmingly in favor of the LS6. You can get the LS6 manifold with all the collant lines, plugs, and gaskets from slponline.com for $399+ shipping. It is by far the cheapest place to get it and you have your choice of egr or non-egr, the non-egr one being the one thats $399. I ordered mine from there and im just waiting for the spring to install it.

~JOSHUA

iTrader: (92)

I have the Weiand/Holley manifold for the bling. From the feel driving around, it actually has more low rpm torque compared to the LS6 I took off. The ports as they go into the heads are narrower, so the velocity is boosted. That helps throttle response and low speed power. I could port, but the car is just as stout.. if not better than before the swap.

I don't know the flow or dyno #'s but I'd say that comimg from a base LS1 manifold there will be a nice bump in felt performance.

bigken

iTrader: (8)

I have the polished holley on mine, and I now have an intake leak from it not sitting right, I am either going to get new gaskets and try changing them or get a ls6, plus when I had it dynod and tuned due to the heat sink I lost hp every pull. but it sure as hell looks nice

SS1875

iTrader: (34)

I had the LS6 and then went to the Holley for a brief time...lost HP on the Dyno and couldnt get the damn thing to seal!! I put the LS6 back on and had no issues.

~JOSHUA

iTrader: (92)

How much power did you lose? I've been told that it's eally only around 3-5hp on a 450 hp engine. Small stuff.

magius231

iTrader: (8)

yes but if you have gone so far as to make 450hp, it wouldn't make much sense to choke it with a poor manifold design thats more expensive then the good one...even if it does look good

Matt D

iTrader: (49)

The LS6 makes more power than the Holley. Plus like everyone said, the composite desgin does not heat soak. Go with the LS6

~JOSHUA

iTrader: (92)

I'd definately go with the LS6 for all out power.
But if you want something custom, you shouldn't fear a metal intake. They've been around forever and they're proven. You can't beat a polished manifold in the visual drag race.

98Z28MASS

iTrader: (6)

Yea thats why I almost went with the holly intake as it looks amazing when you pop the hood, haha but my engine bay is so dirty right now that it would just bring more attention to the fact that i havent cleaned it in a LONG time.