Dual port?(Offenhauser)

[nowicu812]

Has anyone used a dual port on the 307? Does it save fuel and improve low end? Was thinking about putting it on with a 1406, Headers and a 262 isky supercam. Any thoughts.

[nowicu812]

Is the ofeenhauser dual port a good intake for a 307? Has anyone used one? Thanks.


Please do not make multiple posts about the same thing in different forums. Duplicates just confuse things

[Sweet72]

Never heard of it 'till now looks like a high priced piece for a small motor and summit has a ship date sometime in March. At first I thought you meant the Cross Ram Dual Quad setup used on the 69 Z28. Definitely overkill. If someone gives it to you, go for it! But I'd be happy with a Edelbrock Performer RPM or Air Gap.

[tnblazerk5]

Originally Posted by nowicu812

Is the ofeenhauser dual port a good intake for a 307? Has anyone used one? Thanks.

those are great intakes i got one but its at bisquik65 house gettin bead blasted

[69-350]

I agree with Sweet72. Personally, I just ordered some Edelbrock Performers, intake manifold and carburetor.... which will accompany my new Edelbrock Signature series valve covers and my new Edelbrock Pro-Flo air cleaner. Talk about going to town on Edelbrock stuff. But back to the subject here. They sound like pretty alright intakes, it all depends on what you want to spend now. Just remember some more money here, might save you more money down the road. At least it depends on the weight of your right foot. My right foot is pretty dang heavy, even with my S-10's meager 4.3L, I still push probably only 10-15mpg (and that isn't to talk about how much it costs to pay speeding tickets ) but at least it scoots around fast enough. Like said, it's up to you and how you drive. It seems like a good intake manifold for your grocery runs, or your quarter mile runs.

[bisquik65]

You want OFFY power and Old school bonneville <sp? Salt flat tech. Right from the 50's and early 70's


Here is my NOS big block manifold...

[bisquik65]

Here is robb's (tnblazerk5) small block one...

And check this link out....Some cool stuff on here...Offy info...

http://www.offyparts.com/index.php?o...d492904141b80b

[bisquik65]

Now on your normal dual plane manifold...the left 2 barrels of the carb feed the #1 #7 #4 #6 cyl's And the right side feed the #3 #5 #2 #8 cyl's On the dual port the left 2 barrels feed all 8 cyl's and the same for the right...This = better fuel flow...And the one on my 70 LS6 454 has added i would say 75hp to the 425 it has stock... A very good manifold...

[crazy longhorn]

I saw that dual port run on a 232 + .040 AMC 6.......Isky cam, Hooker 3/3 split/duals. The GREMLIN had a toploader 4spd, & an 8"rear......man did that ****er run like stink L

[bisquik65]

Originally Posted by crazy longhorn

I saw that dual port run on a 232 + .040 AMC 6.......Isky cam, Hooker 3/3 split/duals. The GREMLIN had a toploader 4spd, & an 8"rear......man did that ****er run like stink L

In the Nos box...it says on the tourque and hp...it was an average of 23% hp gain...just by adding the manifold...with a matching cam of course...Man i like them...

Old school is cool!!

[ed455]

Used one on a SBF and lost LOTS of power. That divider takes up a pretty large cross-section of the port. I wouldn't bend down to pick one up if it was free. Just MO.

[nowicu812]

I already have one just never used it, I have an edelbrock perfromer too. I was just checking. I know they are on alot of big blocks around here but wasnt sure how they did on the small ones. I know new ones are high dollar (about double the performer) thats why you dont here much about them I guess. Thanks

[tnblazerk5]

Originally Posted by nowicu812

I already have one just never used it, I have an edelbrock perfromer too. I was just checking. I know they are on alot of big blocks around here but wasnt sure how they did on the small ones. I know new ones are high dollar (about double the performer) thats why you dont here much about them I guess. Thanks

i personally would rather that the offinhouser intake and if you use the performer pm me please

[nowicu812]

I was going to go against the grain and use it anyway. I was just wondering what others knew. It seams odd to me that there is just about nothing but the same advertisment Ive been reading for years on the net. I could not find one dyno test, article nothing. The only way I will know for sure is to give it a shot. If it doesnt work out I'll let you know. Witch truck are you putting yours on?

[bellafleck]

Originally Posted by ed455

Used one on a SBF and lost LOTS of power. That divider takes up a pretty large cross-section of the port. I wouldn't bend down to pick one up if it was free. Just MO.

The offy can move alot of air and fuel more evenly but if you do not have the heads to move it or the cam it will not work

I drag race and run an offy on a ford and very pleased

[tnblazerk5]

Originally Posted by nowicu812

I was going to go against the grain and use it anyway. I was just wondering what others knew. It seams odd to me that there is just about nothing but the same advertisment Ive been reading for years on the net. I could not find one dyno test, article nothing. The only way I will know for sure is to give it a shot. If it doesnt work out I'll let you know. Witch truck are you putting yours on?

the one i have now is going on the 67 with the 327 in it
if i ever find anouther one i will put it on eather the 78 blazer or the 67 1 ton
i would love to have one on everything i own

[ed455]

Originally Posted by bellafleck

The offy can move alot of air and fuel more evenly but if you do not have the heads to move it or the cam it will not work

I drag race and run an offy on a ford and very pleased

I was running a 292H Magnum and a set of well ported factory hipo heads. There were no aftermarket F*rd heads at the time. I also ran an offy 360 intake after I took the dual port off. I would bet you're not running a "dual port" on your drag car.

The reduction in intake cross-section alone makes the dual port an economy intake rather than a horsepower intake. The Offy 360 degree intakes are absolutley great and the Port-O-Sonic and Super-Sonic are my intakes of choice on Drag motors. Been there, done that.

Google "Offenhauser Dual Port" and start reading. They make good door stops and perform OK on dead stock motors which is what the were designed for. Also the work best with a spread port carb.

[nowicu812]

Im looking for more low end an mpg on what will end up being a mild moter, Daily driver. Planning on a 60cc or smaller 305 head. Not sure witch ones are the best for under 4 Grand driving.