I have a 350 chevy engine using a mallory unilite distributor what is the spark plug gap for champion platinum plugs number 3025 the engine is 1978

I believe the factory originals are champion brand, and would have been platinum, but it should still run decent with the coppers. The only thing I can think of is they are of the wrong gap. Copper plugs do not come pre- gapped at all and need to be done by installer. The gap for your stratus, if it's a 4 cylinder is .050. Wrong gap will cause no power and shaking. Correct champion number in copper is #443, and should say that on the box/plug.

What size engine?

What size engine? What is the credit card trick, never heard of that one before. Does this car have a knock sensor? Crank sensor?

Mr Bobby I manage to find in my books few things about your model on spark plugs. I hope will help you. Depends the make you have the Gap: 1. Autolite Ap606 Platinum Gap 0.60, 2. AC DELCO Professional Platinum Gap 0.60, 3. NGK G-Power Platinum TR55-1GP Gap 0.60, 4. CHAMPION RS12 PLP6 Gap 0.60, 5. CHAMPION COPPER PLUS RS13LYC5 Gap 0.60, 6. Platinum Alloy Gap 1,1mm if your engine size is 3.1,also for 3.1 3ngine DENSO TT PLATINUM Gap 0.04 inch. select and carry on .

The factory settings come with this parts number:
- Champion Double platinum RE7PYP6
- Champion Iridium Plug 9901

Just replace it, without GAP calibrations.

Hope helps.

Chrysler Voyager seem function well on Champion spark plugs. I had the same issue and only after buying Genuine Champion Plugs, the car resonded with power

The best plugs for a G.M.are A/C Delco.Do not use Champion plugs.You should be able to get these at any parts stores.Hope this helps.Good luck.

Only use Champion spark plugs on a Chrysler product.
Your local auto parts supplier should have info to give you proper plug number. There should also be a sticker maybe on your hood, that has correct number as well.It appears to be RN14PMP5 if you chose the double platinum plugs, or RN14MC5 in the standard copper core. The double platinum are about twice the price but last much longer. Gap is .050". Don't let them talk you into a different brand, Champion only. I have seen too many Chrysler vehicles over the years run bad on other plugs.

Make: CHEVROLET
Model: TAHOE
Year: 2003
Engine: V8 - 5.3L - FI - - FLEX

All details here:

Standart:
- Champion RS14YC .040" (OE GAP)

Premium Class:
- Champion Double platinum 7983 .040" (OE GAP)
- Champion Iridium Plug 9405 .040" (OE GAP) (Original Equipment Manufacturer and/or Original Equipment Equivalent)

Hope helps with this (rated this help) Good luck.

you can find that information in your local chiltons manual or you local parts store