OFFENHAUSER 2X4 for OLDS 455

[Tahiti Tiger Mark]

My buddy just picked one of these up with two EDELBROCK 1404 500CFM carbs. He has a stock 455 and I was wondering if anyone knows if this will give a performance increase or decrease. I have 455 too which is stock except for the .30 ovrbore and the 296H comp cam. He also does not have headers. Any advice, experiences with this setup?
Thanks,
Mark

[malcolm]

It will run (rich). He will cut his gas mileage in half. Power will be limited by his lacking in the other areas. :)
[ September 12, 2003, 09:06 PM: Message edited by: malcolm ]

[victorfb]

a bigger cam, more cam timing, some port work, and headers and it will be a nice increase. besides. they look cool. :D

[Moneypitt]

I've got that manifold on my hydro (Vdrive) with 3 to 4 inch risers and have just put edel 1405 600s on it.. With the old afbs it ran really hard on the top, 5 to 6k, but stumbled bad in the lower and mid ranges, as the carbs were old, and I think clogged up inside. I don't have alot of cam or head work, and use wet logs into ott.. Afbs, like some holleys are actually vacuum activated secondaries, (the upper butterfly). I think you or your friend would benifit from the change. Without the risers your torque range will be lower than mine, but in a jet thats OK. The bottom end will surprise you, mass torque...Moneypit

[DansBlown73Nordic]

I have a T-Ram on a BBC with logs. I do have some head work and small dome pistons. I can turn 5500. This is in a V-Drive.
I think the carbs you got are 450 cfm,s. They are designed for T-Rams. Mine are very good on Gas.

[Tahiti Tiger Mark]

Cool thanks for the info! We will see if we can get his boat moving with that setup. Right now I leave him behind quick, we both have 1976 Tahiti Tigers, 18'. Both have 455, but I have the cam, fresh motor, and a torker with a 650 Holley, turn 5200 rpm and hit about 63mph. My pump needs to be freshened up for sure.
I found a tunnel ram that I am considering, but I will wait to see if he likes the dual quad, if not try it out on mine and go from there. Tunnel ram looks nice though! But I definitely want whatever performs best, looks come second.

[396_WAYS_TO_SPIT]

The tunnel ram looks cool plus i gained more midrange throttle response out of my 455 olds. I like tunnel rams but they are a bitch to set up(dialing the carbs).
396