How to tell if the right intake manifold

rustyold66 · September 9th, 2008, 10:08 PM

I know intake manifolds are swappable between 400/425/455's. I have a 66 425 2bbl and want to swap to a 4bbl. There is a non-EGR 455 4bbl manifold locally on Craigslist and I just want to make sure I am buying the right thing as I am not an expert like some of you out there. What do I look for to ensure this is indeed a 455 Olds manifold?

Thanks,

Rick

rustyold66 · September 9th, 2008, 10:13 PM

...and what size carb should I be looking for? Mabe around 600 cfm??? I don't plan on cracking open the engine anytime soon as it runs pretty well. Just adding duals with Cherry Bombs I got off CL.

Thanks again,

Rick

J-(Chicago) · September 10th, 2008, 03:48 AM

check the tech section on this site for numbers.

Olds64 · September 10th, 2008, 07:34 AM

You should get a Quadrajet to put on it. That will be more than big enough for your engine and it will give you good driveability and power.

Oldsmaniac · September 10th, 2008, 07:41 AM

How to tell?...Easy, First make sure its a BB manifold....measure how wide your 2bbl is and compare it to the 4bbl. The 4bbl manifold will look the same as your 2bbl except for the 4bbl configuration. There are different choke options with the BB manifolds...one is for and air tube to carb choke and one has an area for a divorced choke.

rustyold66 · September 12th, 2008, 03:44 PM

Here's the ad:

http://minneapolis.craigslist.org/pts/831349382.html

The choke is part of the manifold. Do I need to stay away from this or would this be on OK way to go? How much (if at all) would it limit my carb search? Or do I even need to worry about having a choke? It won't be driven in cold weather. And I do not yet know if this is a "J" type manifold, which I guess would be the one to look for.

Thanks all,

Rick

Oldsmaniac · September 12th, 2008, 04:08 PM

If it is a BB manifold that one is correct configuration for a 66 425 engine....the 4bbl used a divorced choke with quadrajet.....measure width to be sure it is a BB manifold or maybe numbers can be run on 442.com

2blu442 · September 13th, 2008, 11:22 AM

Rick, the manifold in the Craigslist ad has the divorced choke with it. That would put it 1969 or older. I don't know if the choke to carb rod is different lengths between 1966-69 but I believe you could get a quadrajet carb of the vintage of the intake and have a good setup. For that price, I'd buy it and then figure out what carb would work. Just the divorced choke coil is half the price he's asking for the manifold! John

September 9th, 2008, 10:08 PM	#1 (permalink)
rustyold66 Registered User Join Date: Aug 2008 Location: Minneapolis, MN Posts: 72	How to tell if the right intake manifold I know intake manifolds are swappable between 400/425/455's. I have a 66 425 2bbl and want to swap to a 4bbl. There is a non-EGR 455 4bbl manifold locally on Craigslist and I just want to make sure I am buying the right thing as I am not an expert like some of you out there. What do I look for to ensure this is indeed a 455 Olds manifold? Thanks, Rick __________________ 1966 Delta 88 425 HC 2bbl working clock "rust IS a metal"

September 9th, 2008, 10:13 PM	#2 (permalink)
rustyold66 Registered User Join Date: Aug 2008 Location: Minneapolis, MN Posts: 72	re: above... ...and what size carb should I be looking for? Mabe around 600 cfm??? I don't plan on cracking open the engine anytime soon as it runs pretty well. Just adding duals with Cherry Bombs I got off CL. Thanks again, Rick __________________ 1966 Delta 88 425 HC 2bbl working clock "rust IS a metal"

September 10th, 2008, 03:48 AM	#3 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 2,696	check the tech section on this site for numbers. __________________ I'd rather have a numbers matching poker hand.

September 10th, 2008, 07:34 AM	#4 (permalink)
Olds64 Landyacht Club President Join Date: Jul 2007 Location: Lawton, OK Posts: 4,286	You should get a Quadrajet to put on it. That will be more than big enough for your engine and it will give you good driveability and power. __________________ Ferris, my father loves this car more than life itself... Apparently, you don't understand! Ferris, he never drives it! He just rubs it with a diaper! Cameron Frye Ferris Bueller's Day Off 1986

September 10th, 2008, 07:41 AM	#5 (permalink)
Oldsmaniac Registered User Join Date: Oct 2005 Location: NJ Posts: 702	How to tell?...Easy, First make sure its a BB manifold....measure how wide your 2bbl is and compare it to the 4bbl. The 4bbl manifold will look the same as your 2bbl except for the 4bbl configuration. There are different choke options with the BB manifolds...one is for and air tube to carb choke and one has an area for a divorced choke. __________________ OCA Member 2587 '59 98 conv. '66 Delta Fact.4spd '66 Delta conv. '67 442 post trac pac '67 442 conv. '68 Cutlass conv. '70 Rallye 350 '92 Custom Cruiser

September 12th, 2008, 03:44 PM	#6 (permalink)
rustyold66 Registered User Join Date: Aug 2008 Location: Minneapolis, MN Posts: 72	Here's the ad: http://minneapolis.craigslist.org/pts/831349382.html The choke is part of the manifold. Do I need to stay away from this or would this be on OK way to go? How much (if at all) would it limit my carb search? Or do I even need to worry about having a choke? It won't be driven in cold weather. And I do not yet know if this is a "J" type manifold, which I guess would be the one to look for. Thanks all, Rick __________________ 1966 Delta 88 425 HC 2bbl working clock "rust IS a metal"

September 12th, 2008, 04:08 PM	#7 (permalink)
Oldsmaniac Registered User Join Date: Oct 2005 Location: NJ Posts: 702	If it is a BB manifold that one is correct configuration for a 66 425 engine....the 4bbl used a divorced choke with quadrajet.....measure width to be sure it is a BB manifold or maybe numbers can be run on 442.com __________________ OCA Member 2587 '59 98 conv. '66 Delta Fact.4spd '66 Delta conv. '67 442 post trac pac '67 442 conv. '68 Cutlass conv. '70 Rallye 350 '92 Custom Cruiser

September 13th, 2008, 11:22 AM	#8 (permalink)
2blu442 Moderator Join Date: Sep 2006 Location: Medford, Oregon Posts: 2,256	Manifold Rick, the manifold in the Craigslist ad has the divorced choke with it. That would put it 1969 or older. I don't know if the choke to carb rod is different lengths between 1966-69 but I believe you could get a quadrajet carb of the vintage of the intake and have a good setup. For that price, I'd buy it and then figure out what carb would work. Just the divorced choke coil is half the price he's asking for the manifold! John __________________ 1964 Cutlass Factory 4spd 1965 442 4spd 1967 442 Auto 1967 Cutlass Convertible 1967 Cutlass four door daily driver 1968 442 Auto 1969 442 W30 Auto 1970 442 4spd 1971 Cutlass Flat Top Wagon 1973 Che*vy 3/4 Ton 454/TH400 Tow Vehicle Only the tow vehicle is finished!

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