WTB 260 Intake manifold

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Old August 1st, 2018, 08:00 AM
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WTB 260 Intake manifold

Hello, looking for an intake manifold that will fit an olds 260 motor. Thanks
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Old August 1st, 2018, 08:33 AM
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Any small block intake should work 260-330-350-403. Some of the earlier ones might not have some of the fitting you need.
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Old August 1st, 2018, 08:27 PM
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Originally Posted by lshlsh2
Any small block intake should work 260-330-350-403. Some of the earlier ones might not have some of the fitting you need.
260 motors have unique (miniscule) ports and thus uses a unique intake. While the intakes from other SBOs will bolt up, the flow disruption from that port mismatch will reduce power below that of the stock DualJet intake. I don't even think an A5 has small enough ports.
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Old August 2nd, 2018, 05:42 AM
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Originally Posted by joe_padavano
I don't even think an A5 has small enough ports.
This was going to be my suggestion. I thought they were the same size? Apparently not.

Good luck finding one. Usually the first thing to make it to the scrap pile if not the whole engine.
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Old August 2nd, 2018, 01:13 PM
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I have 2 of these intakes if you are still interested. Both were taken off of running cars about 2006 and have been in my basement since then. The red/blue one was taken out of a 1978 442. Whole engine compartment was painted red. Don't know why. The other came out of a 1979 Cutlass Calais.

Last edited by 78Cutlass4Speed; August 6th, 2019 at 05:34 PM.
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Old August 2nd, 2018, 01:15 PM
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I can take more pictures if needed. PM me.
Phil
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Old August 2nd, 2018, 01:34 PM
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I have an a4 from a 84 h/o if you wanted to go 4bbl. ports are pretty small.
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Old August 2nd, 2018, 02:41 PM
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Originally Posted by 78Cutlass4Speed
I have 2 of these intakes if you are still interested. Both were taken off of running cars about 2006 and have been in my basement since then. The red/blue one was taken out of a 1978 442. Whole engine compartment was painted red. Don't know why. The other came out of a 1979 Cutlass Calais.
Hello, I appreciate the reply. I want to be sure the one I get matches up with a 260. As stated above, the 442 wouldn’t. As far as the other one, is there any markings on it to help identify it?

Thanks again.
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Old August 2nd, 2018, 02:51 PM
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Originally Posted by Vintagelove
I want to be sure the one I get matches up with a 260. As stated above, the 442 wouldn’t. As far as the other one, is there any markings on it to help identify it?.
These are both the same manifolds. Why do you assume the 442 one is wrong? In 1978 the base engine for the 442 was a 231 and option for 260 or 305. That manifold is definitely not for a 305
Maybe you missed this tag in the picture

Last edited by Allan R; August 2nd, 2018 at 02:55 PM.
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Old August 2nd, 2018, 02:58 PM
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Old August 2nd, 2018, 03:00 PM
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Both intakes were removed from Olds 260 V8 engines. The 1978 442 could only get 1 of 3 engines- Buick 231 V6 2bbl, Olds 260 V8 2bbl, and a Chevy 305 V8 2bbl or 4bbl. I parted out a 1978 442 that had the 260. The car ran but was in sad shape. Probably could have been restored if I wanted to spend many thousands of dollars, but it wasn't worth it.
Both intakes have the casting # 558916 and have a large A1 on the front left area next to the thermostat housing.
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Old August 2nd, 2018, 05:48 PM
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Originally Posted by Allan R
These are both the same manifolds. Why do you assume the 442 one is wrong? In 1978 the base engine for the 442 was a 231 and option for 260 or 305. That manifold is definitely not for a 305
Maybe you missed this tag in the picture

Hello, my apologies. Obviously I was confused. Thanks for the information.
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Old August 2nd, 2018, 05:49 PM
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Originally Posted by 78Cutlass4Speed
Both intakes were removed from Olds 260 V8 engines. The 1978 442 could only get 1 of 3 engines- Buick 231 V6 2bbl, Olds 260 V8 2bbl, and a Chevy 305 V8 2bbl or 4bbl. I parted out a 1978 442 that had the 260. The car ran but was in sad shape. Probably could have been restored if I wanted to spend many thousands of dollars, but it wasn't worth it.
Both intakes have the casting # 558916 and have a large A1 on the front left area next to the thermostat housing.

Pm’d

Thanks
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Old August 2nd, 2018, 07:09 PM
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Originally Posted by oldolds88
I have an a4 from a 84 h/o if you wanted to go 4bbl. ports are pretty small.
And yet, STILL too big for the 260. Go back and read post #3 again.
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Old August 3rd, 2018, 08:35 AM
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Someone sell him an intake for a 350 with the rest of the 350 bolted to it.
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Old August 3rd, 2018, 09:57 AM
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Originally Posted by Koda
Someone sell him an intake for a 350 with the rest of the 350 bolted to it.
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Old August 3rd, 2018, 11:59 AM
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Originally Posted by Koda
Someone sell him an intake for a 350 with the rest of the 350 bolted to it.
LOL,

i can attest to the legendary performance of the 260. 0 to 60 in a week!!!
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Old August 13th, 2018, 06:57 AM
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78Cutlass4Speed has what you are looking for, the legendary alum manifold, looks to be a good one without any helicoiled threads anywhere which in and of itself is worth the price of admission.
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