Can I put a 4 valve carburetor on my 67's 289 engine???

67_FASTBACK · 06-19-2005, 03:28 AM

I want to put a 4 valve on my 1967 fastback's 289 v8. It has a 2v Carburetor on it. Is this the only one that will fit on my engine. I want to do this to get the extra hp out of my engine. If putting on a 4v carb is not an option, what else can i do to raise my hp? muffler? some kind of intake upgrade? help me plz.

thnx

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nualln · 06-19-2005, 03:41 AM

you need to get an intake manifold that will allow you to use a 4v carb.

If you want to raise HP, consider headers, mufflers, h or x-pipe.

The potential for a 289 engine is almost limitless, so keep looking around.

BTW, what are you intentions for the car? street...dragstrip? casual cruising and carshows? daily driver?

67_FASTBACK · 06-19-2005, 04:32 AM

Daily driver with the occasional street race. Some cruising also.

thnx for the advice man.

nualln · 06-19-2005, 04:51 AM

I have a 67 with a edelbrock performer intake and a holley 4160 (4v, 600CFM).

It's my daily driver, and I ocassionally punch it just to remind myself how much power I have.

Before you go out and blow tons of money to beat the other guys with souped up civics, do yourself a favor and get a pertronix ignitor and the flamethrower coil. It replaces the points and adds a little horsepower, as well as the reliability of not having to deal with points corroding/trouble starting. It's about 60 bucks for the ignitor and 30 for the coil. I noticed a little better off-idle throttle after I installed it (i.e. better peeling out). http://www.pertronix.com/

You could also get yourself a K&N air filter. Those things are massive and have a 1 million mile warranty. Theyre pretty expensive, but you have no air flow restriction. K&N filter from summit

With Carburetors, bigger is not always better. You want about 600 CFM for your 289. Buying a 700, or 800 CFM will only flood your engine and create hesitation (not to mention terrible gas mileage).

When you upgrade to a new manifold, try getting a dual plane manifold. They allow even distribution of airflow into the cylinders. It's a little more expensive, but worth it.

eZ · 06-19-2005, 04:55 AM

nualln--
im having a 302 built now, should be done mid next week...i went with the performer intake and a 700 carb...you think the 700 is too much?

nualln · 06-19-2005, 05:00 AM

Im not a carb guru, but that seems to be on the edge of too much. It will probably work though.

Are you building it, or are you having a mechanic build it?

67_FASTBACK · 06-19-2005, 05:17 AM

Dumb question, how do mufflers affect engine performance and overall hp (technically)

TBIAgent69 · 06-19-2005, 07:38 AM

a 700cfm is probably going to be too much unless you have a pretty dang high performance engine. Not that I like to magazine race, but take a look at this month's mustang monthly, and mustang and fords magazines. There's an article about carb tuning (using a 351W though) and also an article about building a budget 302 block. If you do the calculations for a stock motor, (I can't remember the formula for it, but I have it in my room somewhere) you'll end up with a 450cfm carb being right for a motor that tachs out at 6k rpm's.

eZ · 06-20-2005, 04:36 AM

im having a mechanic build my 302...dont have all the specs for the motor yet but i gave the mechnic 5 grand to play with...i thought i remember him saying a 700 cfm

nualln · 06-20-2005, 04:41 AM

If your mechanic is reputable, then you're probably fine.

Man, 5 grand to throw at an engine... Better be awesome.