Where's The Horsepower? This Big Block Powered 1966 Plymouth Belvedere II Needs Help

I'm going to state the obvious. That car is beautiful

A couple years ago I ran into almost this same issue with a friend of mines 400,after many hours of fiddling and tuning and still never running right we finally found from the information from all the specs of the engine when it was rebuilt that the compression only came out to just barely 8.0:1,and they had put a huge cam in it,and evidently they don't like that,because we put about a 3 or 4 sizes smaller cam in it and it ran great and cured all the bad running and tuning issues,ran like a totally different engine.... Not trying to say that's the issue with this Car,just something we ran into with that engine....low low compression with Huge cam= crappy running car lol. That is a beautiful Car!!!!👍

My friend Dave has a 67 Belvedere with a factory 426 Hemi radio and heat delete. Runs in the 10 second range!

I have picked up so much knowledge watching your videos and I have been working on cars for over 35 years. Thank you for that!

“It’s so weird that the gas gauge works in this car” 😅😅 I feel your pain J.

I have been around cars a long time and done some mechanic work so I have learned something about engines. I have to say your have the best knowledge about the stuff I have ever seen. Thank you for doing what you do.

That is a simply GORGEOUS color!

Really knowledgeable in depth diagnosis on a very deserving mopar.

15:35. You are saying the cam is slightly advanced. But something is missing here According to the Mopar Bible, you need to either: A. Have the heads off and use a degree wheel and a dial indicator on the top of the number one piston. You don't just find the top, you measure with the piston down on each side , say 40 thousandths and use the degree wheel to find the mid point. B. Use a degree wheel and a TDC stop, a threaded tool that goes into the spark plug hole and rests on the top of the piston when turning clockwise, then again when turning counter clockwise and using the degree wheel to "split the difference". A screw driver in the spark plug hole is really only a very rough way to check these events since the piston seems to "dwell" at the top for quite a few degrees. You need to find real TDC on the crank both to verify the cam is timed, the vibration damper is is marked The way things are these days, it might be worth it to verify that the cam lobes are lined up since the cause of cam and lifter failure is bad angles of the lobes and lifter faces from the camshaft factory (not bad oil or technique) who knows if the loves even line up with the number one intake? I admit I did not understand what you were saying about the two valves both being at a certain spot... I am sure it is valid.... but is it precise? As a method for determining if the cam is advanced. I don't think we can be sure if the cam is advanced or straight up from that method. And, as others have said, advancing the cam helps low end performance, retarding it helps high end. You said it the other way around. I wonder how much vacuum there is at idle in that car.

Have always loved the 66-7 B bodies. However the 66 Coronet 500 is my favorite. Buddy had one. Console and buckets. Black interior with white seats. Gorgeous car. Color was kind of a champaign goldish. Very pretty. Had a 361. We put manifold, afb off of a 64 383. Always thought the 361 had more in it than we were able to coax. But alas kids experimenting.

I added floor insulation under the carpet. 440 Headers make some heat. I failed to leave room for the gas pedal and my secondaries would not kick in and downshifting was sketchy. Bing the light came on 7/16" of insulation can do that. Now there is a hole in the insulation, and we are good again. We never overlook the obvious like is the fan turning in the right direction for engine rotation, mechanical or in the intended direction for electrical fans. I have a '71 Charger 440 with aluminum pullies and alternator brackets. I run the stock fan and a 3-core Champion radiator without a shroud, and it does well. Cars, never done.✌

the rectalanguitive exhaust ports mimic the rectalongical design of everything else on the car. I've never noticed how well done the instrument cluster is on these cars. The body work on these later 60s B bodies always looks high quality, a real step up over the earlier cars.

That Belvedere in that color is BEYOND BEAUTIFUL.

I just wanna say thank you for fixing my 66 Charger! I kept having random stalling at idle, i recurved the electronic dizzy using your trick, set idle at 20 deg, total at 38 and Its never ran so happy! I've been working on my Mopars for over 30 years but still learning tricks from you. Love the channel, and keep rockin!

That is one beautiful Belvedere. You get to work on and drive some really nice cars! Loved the way you were troubleshooting that accelerator cable linkage too.

That paint looks like candy. Absolutely beautiful

Outstanding car! Bet she turns a lot of heads!!👍👍❤️

i only had one give me an issue it was a Pontiac 400 with that same carburetor and a factory fuel pump and it was putting out 9 psi and I had to install a regulator and problem was solved but again that was only one, and that is a sharp car and the color and trim really look good, and nice job on that disturber and making the car happy again

Digging your channel more and more. Your knowledge is amazing and you get in some cool cars you go over. I raced 400’s and they do love timing when you cam them up. Yes, I normally gave it all the timing it wanted until it pinged on a hard pull then I backed it off enough that It no longer pinged. You know more than I do and I have forgot a few things so I will say you did fairly well with what you are working with. Nice work. It seems to pull decent enough for a street car.

I absolutely love that car and I like yourself, I usually only like the factory interiors but that one is done very tastefully. You did a great job tuning that thing looked seriously quick