Good day all. I am currently in the midst of a frame off restoration of a 1972 Chevrolet K20 pickup. Has a 455 olds inside of it. When I picked it up, she started great, drove off the trailer and into the shop. I am just starting to get the engine ready to put back into the truck. Here's where I found my little problem. I was looking to rebuild my carb (gaskets, seals etc.) and I gave a company the carb number. Rochester Quadrajet R4-E4ME and the number is 17084240. I was then told this is off a V6 olds engine. After a bit of research I am still stumped as to what carb originally came on this engine. Block number is 396021F, J heads, W intake manifold and a few other numbers. After looking into those I figure the motor is out of a 68-70 Tornado. My questions to the more experienced is,

1/ What carb should I be hunting for?
2/ Could I use this carb even though it is for the V6(apparently) I mean it started and ran just fine so am curious if it would be a suitable substitute. Would I be losing out on power, gas mileage or all of the above? If anyone has a similar experience or story, I'd love to hear about it.

Thanks in advanced for any information!

 

The second "4" in the id number means it is off of a Buick. The "84" means it is a 1984 carb. The last "0" means it was off of a automatic transmission car. Not much info but I hope it helps.

 

17084240 is indeed a quadrajet for a 1984 Buick V6. It will run on your engine because the idle and transfer calibration is about the same . However the primary and secondary calibrations will be incorrect. Also, the Buick carb will be VERY restrictive to your 455 in the secondaries because the V6 carbs had very limited air flap opening. Your 455 will move almost twice as much air as the V6.

What year is your 455?

For a Toronado 455, the correct number will be something like 7028252 (1968) or 7042252 (1972). The 4th digit represents the year. The 6th digit being 5 represents Olds. Among the Olds Qjets, the last digit being a 2 represents Toronado.

I would submit to you that about any Olds 455 Quadrajet would work for your application, not just the Toronado Qjets. Olds 455 Quadrajets (non-toronado) end in 251. For example, a 1973 Olds 455 Qjet is 7043251.

Get an Olds 455 Qjet and have it matched to your engine's specs if you have a cam in there or anything like that.

Good luck

www.everyday-performance.com

 

here is a 72 toronado carb 7042252

https://classicoldsmobile.com/forums...7042252-a.html

 

J heads 75-77 455, but i would go with any q-jet 70 -73

I have a 73 from a cutlass 455 for sale 65.00 plus shipping

 

May be a bit lean calibrated but it's a good place to start.

 

Thanks so much for the input guys! Really appreciate it. Lunaboy I have sent you a PM about yours for sale.

 

Close, but not quite. J heads were used from '73 until '76, the last year the 455 was made.