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i think you will see post 6 is right with float or more likely the needle and seat are leaking down.

you're actually one step hotter plug with the 86 calls for 85 so the plugs are not too cold. need to take it out and run it with as little idling as possible and when you get home turn it off as soon as you get in the driveway and pull one of the back plugs.

1966 went with a shorter one because it was hard for the backseat passengers to get from one side to the other side.

Sorry I am not arguing just trying to learn by going back and forth and expressing my opinion and what worked for me over the years. I already learned a lot about the site you posted up moparts.com thanks, plus everyone thinking that the 516-915 heads were 73 cc because it was passed down over...

there are no Dyno pulls to compare the only way to find out is for me to pull the heads off and put in 1.74 valves without doing anything else. the 906 would make it slower losing a 1/2 point compression. stronger off idle with the 1.74 valve maybe but it won't be any faster off the line The car...

let's back up to post 1 and post 38. post 1 is going to keep the 516 heads I would say why not for what you're doing for a nice driver. do a good valve job, check spring pressure maybe add a shim to get back some spring pressure or new springs, check for straightness and check guides. new...

look at my video on this forum. how a nice build street 440 in a c-body cruiser should perform. I kept the 1.6 in the 915 heads. smaller valves are for torque that is what Buick did with the 401-425 nail head with their high torque at a low rpm. yes the smaller valve will run out of steam very...

never seen a 915 or 516 heads that were 73 cc unless a lot of milling. they were 79-80 cc. the 1.60 will not hurt anything other than power in the upper rpms plus the 1.6 helps your torque in the lower rpms

since this video i added a avs2 800 which helped off the line torque and then after a rpm performer intake helping power in the upper rpms. you could feel the difference in each one.

mine came from topsonline for my newport. right top right price.

the photos on ebay don't look washed out

it's got the hp exhaust manifolds.

clutch fan for sure. ac cars came with 26 inch radiators so shouldn't be a problem

your long duration, wide separation cam will give you less compression not more. don't know where your getting more torque in the original power band it would move the power band to a higher rpm range. the new valve job could be why it feels stronger than with your old worn out heads you took off.

plus you can always add some lead substitute once and a while. i always add a little octane supreme it has real lead in it.

how many miles were on the motor ?

i like this one but then again it's mine. lol

oil only goes to the rockers at a certain position of the crankshaft so you need to turn the engine over to get there.

check your points adjustment gap. did you use a dwell meter ?

if you drive like a old lady your good. baffles are good for fast take offs especially on a center sump oil pan like our c-bodys. windage tray good for high rpms to get the oil back down to the pan because the crank is whipping it around and yes a little more hp. i had problems with both take...