Performance expectations from manifold change?

[El Prosecutor]

What performance increase (if any) do you all think I could expect by just changing the stock intake manifold on my 455 to a Performer intake?
I have an Edelbrock 1410 carb, stock engine build, Hardin logs.
I have a covered engine compartment and am not going racing but would like to do any simple bolt-on things I can do to get that little extra out of it, this seemed like it might be one. Waddaya think?

[jbone]

I've always been told the Edelbrock Performer RPM Air Gap is the way to go with a lower rpm stock application. But, I'm no expert.
I was told it could be worth up to 25 hp on my 502 though.
J

[maxwedge]

I've always been told the Edelbrock Performer RPM Air Gap is the way to go with a lower rpm stock application. But, I'm no expert.
I was told it could be worth up to 25 hp on my 502 though.
J
They don't make a RPM air gap for the 455, so that's out.
I have just swapped the stock manifold and Q-jet on my 455 for a Performer manifold and carb. Haven't run the boat yet, but I'll be glad to let you know in two weeks or so how it works.

[El Prosecutor]

They don't make a RPM air gap for the 455, so that's out.
I have just swapped the stock manifold and Q-jet on my 455 for a Performer manifold and carb. Haven't run the boat yet, but I'll be glad to let you know in two weeks or so how it works.
Thanks MW, I will be interested to hear.
BTW, that is one crazy looking dog! :boxed: