4bbl Intake to Olds 260 V8? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-24-2004, 07:58 AM
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4bbl Intake to Olds 260 V8?

Anyone know if you can swap a Olds 4bbl 307 intake on to a Olds 260 V8?

I have 76' 260 with #10 heads and #1 iron dualjet (2bbl) intake.

I understand from another BBS that the 85-90 307's with A5 intakes and 7A heads have the same port sizes as the 260's but from yet another I have been told that the ports won't match up.

Can anyone clear this up for me?

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Old 07-24-2004, 08:15 AM
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I thought it was the other way...I could swear you can use intake from say a 350 Olds on 307, if the 307 has the 7A heads. maybe Im mistaken
I dont think itll work on the 260...why would you want to anyway? Just curious, wont make it fast
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Old 07-24-2004, 08:32 AM
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Trying to boost perf just a little. It's not going to be a racer, but since the dualjet 2bbl on it now is only rated for 165 cfm, I figured I could get a little more out of it with the 4bbl.
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Old 07-24-2004, 01:58 PM
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Don`t waste your time. the money you spend on gaskets and etc. it will make no power difference so in the end is not worth it, the best place for a 260 is the junk yard or a boat anchor. They used the dual jet and a small runner intake to increase velocity to help low end torque which a small cubic inch engine needs all it can get just to get the vehicle to move.
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Old 07-24-2004, 02:01 PM
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DV is right, there are some engines that dont have any potential for performance & the 260 Olds is one of em
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Old 07-24-2004, 03:37 PM
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Technicaly all the intakes will bolt up to it, thats A4, and A5 I'm speaking of (307, 350, 403)

The A4 will bolt up just fine, but those tiny 260 heads have smaller ports so the incoming air will be tumbling around as it hits the sides of the head. The A5 intake(85-90 307 roller) is another direct bolt on, but I'm pretty sure the ports match up if not a bit off on either the top or the bottom. While it is worth installing a Q-jet on the 260 since the dual jet chokes it to death, I really think you should take those #10 heads off and aaa.. sell em to me! They work wonders on a 403 or 307 you know! A little valve seat work and some porting.

Another trick to to do is go out and buy an intake gasket for the 84 and lower 307s and do a simple port match to the A4s bigger intake runners, this way the air will not be hitting a brick wall on it's way in. Nothing fancy has to be done here, just curve the outside material on the heads to match the intake gasket. But I REALLY think you should sell the heads to me. I could put them to good use

Last edited by 87442lover; 07-24-2004 at 03:46 PM.
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Old 07-24-2004, 04:32 PM
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An A5 and a 450 Holley Economaster will give you a seat of the pants increase from 3000-4200. Didn't change the bottom end power at all. Dan
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Old 07-24-2004, 10:41 PM
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Thanks for the replies.

Ohio-Dan, what heads did the 260 have that you did this with and did the A5 or heads require any porting?

Does anyone know what the difference was between the 10 and 2A heads? Someone from another BBS said they did put an A5 on 2A headed 260, but I have a 10 head and the gaskets are different.

This is the one for 75-76 260 and other Olds intakes:

http://www.pickproparts.com/picture...artnum=MS96027%

This one is for a 77-82 260 only and has small port openings:

http://www.pickproparts.com/picture...artnum=MS96026%
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Old 07-24-2004, 11:26 PM
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My 260 was out of a mid 70's Buick Apollo that I put in an 84' Cutlass for the wife. No idea what casting heads it had. It was no powerhouse, but it did have allot more bottom end torque than the 231 V-6 it replaced. I put the 4bbl intake and carb on out of necessity more than anything else. The 2bbl was a piece of junk that refused to start after sitting overnight. The intake from a junk yard 307 powered Olds 88 and the Economaster carb that I already had, fixed the problem. I did no port matching, and reused the original 307 intake gasket. It was in better shape than the 260 gasket. I sprayed both sides of the gasket with Permetex Ultra Copper and never had an issue out of it.

With the 2bbl carb, the motor was done by 3500. With the 4bbl carb, it would pull good to 4200. Dan
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Old 07-24-2004, 11:57 PM
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Thanks Ohio-Dan, it would have to be a 1975 4-dr Apollo (2-dr version was Skylark and after 75 they were all Skylarks) as this was the only year the Apollo would have had a 260. 75' was first year for the 260 and it would have had the #10 heads.

Do you think a qjet from the same era would work out as well as your Economaster?
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Old 07-25-2004, 12:18 AM
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Don't know why it wouldn't. Your dueljet is the front half of a Q-jet. The air doors on the back half would only open as far as needed to feed the 260 so it wouldn't be over carbed. Dan
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Old 07-25-2004, 12:45 AM
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Quote:
Originally posted by Ohio-Dan
The 2bbl was a piece of junk that refused to start after sitting overnight.
Common problem, but not really a "problem" Usually the dual jet leaves alot of fuel behind in the intake, fuel bowl and such and you can usually start the car within a few hours just by a quick flick of the key. As the fuel evaporates over night it leaves a rather dead car in the morning. You can turn that key and keep the motor cranking, but it wont start. Simple trick, step on the gas once or twice, the pump squirts fuel out and it starts right up! Now thats when the choke gets stuck

I'd rather have a CCC Dualjet than a POS holley any day!
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Old 07-25-2004, 08:06 AM
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Is there anything I can do on the exhaust side? It's currently all stock. Would a Y-pipe after the cat and dual resonators help it at all or would it just be cosmetic/sounding better?

By the way, 87442lover, you are the only one I have come across that thinks the 260 heads are worth anything at all. From other BBS's I have heard of many reasons why they are considered useless on any other SBO other than a 260. Have you ever seen them used on other Olds motors ?
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Old 07-29-2006, 05:20 PM
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? for Ohio_Dan

I have a 260 v8 stock omega and am wanting to play with it a little which would be the better intake to put on it to give me a little more top end power?
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