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Hi 448Scamp this is the catch 22, I been trying to figure out what oil will have enough zinc for the 520 lift cam but not too much where it will be problematic for the cats, maybe someone can provide a recommendation.

Thanks Ccas, I just ordered a couple of Magnaflow metallic substrate converters and I'm going to do exactly that, get the car running as it should and then investigate the problem later. If my car is going to be eating converters at least the Magnaflow Converters are way cheaper then the Vibrant...

Thanks Syleng1, your telling me what I already feared, in other words make some changes or be prepared to be replacing cats on a regular basis.

The cats I'm running are from Vibrant Performance Gesi HO Series Part# 7525, the problem happened after driving on the highway for 28 miles at 60-65mph.

Syleng1, not a silly question, I'd be asking the same thing. I'm a double lung transplant recipient, had the cats installed to help lessen the fumes for health reasons, wasn't an easy decision to make at the time to have these installed on a car that would never have them in the first place...

Hi, I'm running dual Catalytic Converters on my 68 Cuda, I have a noise coming from the vehicle that sounds like a rattle snake or like someone shaking an empty can filled with sand or very small stones, I believe one the converters is on its way out, would you folks agree based on this symptom...

I should mention that I'm running floor shift (not column) with a 727.

Have long tube Hooker headers (5902) on my 340 in my 68 Cuda and have power steering and they fit. Its not a straight forward install (then again what header is on an A body especially the driver side) I didn't need to modify anything other then running the center link in between the tubes on...

I'm waiting for Valvoline & Torco to get back to me, I have interest in the one product from Torco as shown.

Hi Yellow Rose, I hoping a performance engine builder on here will post their thoughts in regards to my situation. If my cam lift wasn't as high then I wouldn't be as concerned. I believe Torco is synthetic which can't be run in a rebuilt engine till it hits 3000miles.

Hi omahamoparguy, the lift on my cam is high (520), I might need a little higher zinc based oil for this reason then again want the hell do I know. The high flow cats are expensive about 340 U.S each, not something you want to replace soon. I talked to Vibrant Performance where these cats came...

Hi Phreakish, there is a zinc replacement additive called Hyper Lube, not too many people are familiar with this stuff including myself, my engine is recently rebuilt and only has about 1500kms on it. I talked to a representative at Hyper Lube and was told that their product is not to be used...

Hi yellow rose, I'm running cats due to health issues involving my respiratory system. Because of the cats this is the reason I'm asking what is the minimum ppm of zinc that is required for adequate protection for a high lift cam yet won't kill the converters anytime soon. Example: Valvoline VR1...

Hi roccodart440, its a 68 Barracuda with a 340, with a crane cam with a 520 lift, cats are high flow from Vibrant Performance as shown in pic.

Good question, I have no idea how much zinc or over what duration of time it would take to ruin the cats. What is the happen medium, its like a catch 22, you need a certain amount of zinc especially with a high lift cam, but not too much that it will destroy the expensive high flow cats. What is...

What type of oil does one use to ensure it has enough zinc to help protect the cam against wear, yet not too much zinc that it will damage the catalytic converters?

Thanks AJ/FormS

The headers I had sent out to be ceramic coated and were just re-installed recently.

Thanks everyone for the responses, my hooker headers are ceramic coated inside and out, operating temperature on a cool summer day is 180 and on very hot humid day it climbs to 190-200, trans (727) temp is always at 150. Engine has about 600 miles on it so all fluids and tune up parts are fresh...

Is it just me or do headers radiate a lot of heat inside the engine compartment, my car always runs at normal operating temperature, but after its been driven and one goes under the hood every single component so hot to touch even the windshield washer reservoir, fender walls, battery cables...

Hi clifftt, I been so busy doing house renovations haven't even touched the car since starting this post. On a tight schedule as a good bit of this work is seasonal due to the winter. I do like the idea's mentioned by some of the members, I will try to implement some of their suggestions and...

I was contemplating the hand held setup so I can get a reading on the carbon monoxide level just to see out of curiosity how bad it is.

Hi tomwheels, the trunk weatherstip on my car is new and goes all the way around, are you suggesting thats not adequate that I should implement another strip in conjuction with the one on the car along the bottom ledge?

lol,Those tail pipes on one's car would definitely warrant a beat down from a crowd at a car show for desecrating a Mopar. The attached pic shows the placement of my tail pipes.

Hi Treblig, you are correct there are seals for the bumper brackets, these pieces are similar to the seal used between the inner quarter panel and filler tube. My car actually had these seals installed upon the restoration of the car over the last year.

The replies from you guys is very very helpful insight, thank you very much, I will be on a mission to try and fix this using the advice provided and hopefully have some updates soon.

Hi AJ, the symptoms I experienced after driving the car 45kms was excessive tiredness, felt a bit off and some lost appetite. I didn't have any issues prior to entering the car and really didn't exert much energy prior to warrant that kind of tiredness. This is why carbon monoxide came to mind...

Thanks guys, i'll definitely get on top of this.

I feel after driving my 68 Cuda that I am experiencing symptoms that might be brought on from breathing in carbon monoxide. The exhaust system from the engine to the rear bumper is new and has zero leaks. The trunk seal is new, actually all the seals on the car are new and the car has zero rust...

Anyone using Remflex header gaskets on their 340 with power steering. My concern is the driver side header sits so close to the power steering gear with no room to spare, and these gaskets are thicker then the regular ones, so does this cause any issue after install with the header in relation...