Thread: 327 bored .060 over

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So I currently have a 33 Plymouth coupe that my grandfather left me that he built from the ground up. I know it's been bored 60 over. Has a crower cam .488 .501, has a forged gm crank with good rods and small dome pistons about 10.5 to 1.

My question is, It needs a new carb. Its got a quadrajet on it now meant for a 350. And I've come to find the holley 670 street avenger seems like a good candidate just wondering if anyone had other thoughts...also it needs a new distributor and I was thinking about switching from points and putting an hei in there.

I know basics about these things which Is why I got on here to learn more and get some good opinions.

In my opinion, the Quadrajet is the finest fuel/air mixer on the planet, with the possible exception of some Webers and Dellortos. My best advice is to rebuild what you have, starting with this book by the Quadrajet guru, Cliff Ruggles.....
How to Rebuild & Modify Rochester Quadrajet Carburetors (S-a Design): Cliff Ruggles: 9781932494181: Amazon.com: Books

Also, refer to youtube. Go there and type in "Quadrajet" and you will be presented with quite a few rebuild videos, one that is, I believe, 7 videos long.

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Originally Posted by techinspector1

In my opinion, the Quadrajet is the finest fuel/air mixer on the planet, with the possible exception of some Webers and Dellortos. My best advice is to rebuild what you have, starting with this book by the Quadrajet guru, Cliff Ruggles.....
How to Rebuild & Modify Rochester Quadrajet Carburetors (S-a Design): Cliff Ruggles: 9781932494181: Amazon.com: Books

Also, refer to youtube. Go there and type in "Quadrajet" and you will be presented with quite a few rebuild videos, one that is, I believe, 7 videos long.
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Probably the best advice you're going to get and if you don't agree just go to the hotrodders website and ask there, they're full of experts and will tell you so.
If you don't want the hassle of changing the distributor out you can replace the points with a Petronix module and matching coil,theirs, and have good results, but stay away from anything that is stamped Accell, pure unadulterated junk.
I would keep the Q-jet, rebuild it per the book mentioned advice and add an electric choke as I did on my 76 Vette.

An accell is on it now... I'll look into rebuilding the carb. But is that the right size? The reason I ask is because when I ran the part number on it, it came up for a 350 truck motor.

Ditto what Tech said - I love Quadrajets and have had really good performance with them - Interestingly enough, years ago I ran a Weber DCOE's on an Opel that had and found them to be great units as well.

There's really only two sizes of Quadrajets. The smaller one flows 730-750cfm and the larger is an 800cfm unit. I'd bet you have the smaller one and it's the correct one for your applicaiton. Truck models typically had a bit different linkage as many times they are standard shift and don't require the attachment for the kickdown cable. The 800 is not real easy to find anymore and it was used for big displacement engines.

Regards,
Glenn

So what your your saying is that if I take the quadrajet off now to rebuild it, and buy another I should go with a carb. Rated for 700 to 750 cfm to match the quadrajet?

A 355 Chevy will make max hp with a 750 carb, vacuum secondaries if auto trans with converter stall speed under 3000 rpm's, or a double pumper if the car is a manual transmission or an auto trans with converter stall speed over 3000 rpm's. As I said, that's for max hp.

A 355 Chevy or any other internal combustion motor will run and take you to the market or to bingo or from California to Maine with ANY carburetor on it, even if you adapted a one-barrel carb from a pickup truck 6-banger.

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Remember that if it has a quadrjet that you'll need to change the manifold if you go square bore holley--------

Or you can use an adapter. I don't like 'em, but for using a square bore carb on a spread bore manifold, it'll work. The open plenum may even help to make a little power, maybe yes, maybe no. It's a crapshoot as far as using a spacer for making more torque or hp.
http://www.summitracing.com/parts/trd-2066/overview/

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guaranteed vacume leak

Originally Posted by jerry clayton

guaranteed vacume leak

That's why I said I don't like 'em, but if you install with care and use a good sealer, you can usually muddle through it for a temporary fix. I'd never use such an adapter for a permanent fix. It should work though, until the OP can get the Quadrajet rebuilt.

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I have also used some of the Holley spread bore carbs--usually tho on a Chrysler back in the 70s

Sounds like I'll just rebuild the carb. Then.. I plan on doing the initial start up in may. Anything I should be looking for or do besides lube everything up? And remember I know basics to cars and am trying to just be a sponge to all of this and take as much as I can from you guys. So dumb it down for me if possible haha. Thanks again for all the info already guys!

Change any rubber sections of fuel lines, filters, maybe even put on a new pump because modern fuels probably have destroyed those hoses and diaphrams

Just bought thay book and another on chevy small blocks... so right noe the plan is to rebuild the carb by using this book and seeing if that helps the idle issue. I didn't mention it before. Last time it ran last year it would cut out whilet at idle after about a minute or so. Could that mean a vacuum leak at the adaptor possibly or coukd it be the distributor as well. Figured I'd start with the carb first and work my way back... any other suggestions