Technical Rebuilt 302 has no get up! Help.

Got into the motor!
#1

 

Does that intake valve look really bent? Or is the camera angle?

 

It looks like it’s canted, like it’s not in the same plane as the other intake. Brandon141 can you get a top side picture of that head? The valves don’t look right
Dan

 

And post “full image”. Can’t expand a thumb nail on my phone, it washes out and goes away.

 

tip some gasoline into number one chamber and see if it leaks past the valves

 

So the piston looks fine. I poured some fuel into the chamber on the head and waited like ten minutes. No leak down. I’m going to pull the motor and go through, change rings on 1 and 6. And change the cam. Sucks, but my mistakes caused this. Live and learn!!! I’m thinking B or E cam with 4:11 gears.

 

Who put the rings on the pistons? If you look closely at #1 you can see a gap between 6 and 7 o’clock and there are scores in the cylinder around the 4 o’clock position. Sure is a lot of oil in that cylinder too. I’d have to be there in person but I’m pretty sure that you might have the rings in the wrong spots on a couple of pistons

 

I was told the block only had 4000 miles. I should’ve checked the compression when I had the motor on the stand.

 

Brandon you might get a fellow HAMBer to help in person , just post your general location , area of state or town and state, if they are close they can PM you and you can trade phone #s or whatever.A lot of us are retired and always looking for a good outing.
Dan

 

That’s what I’m saying!!!!

 

I am located in the “thumb” of Michigan.

 

Crap I’m in the arm pit of Tennessee lol

I know there has to be some folks around you that would love to come over and help you out. I know if I was closer I’d love to turn some wrenches

 

Aren't those pistons for a "twisted Wedge" head?

 

I have an e303 in my 87 5.0 block, AOD, and 3:50 gears. My 55 is a mild custom and not a street brawler but it cruises down the highway nicely. 4:11 may be the ticket for what you are after. Good luck, I'll be following along.

 

While the head is off,. now would be a good time to check TDC against the marks on the balancer!

 

4k miles with a Blower? Like the one I pulled out of a FOX body...was shot, broken rings, junk heads.

Bought a 380hp 306 roller from blueprint with Dyno Sheet. Strong unner around town. Heads looked like yours.

I got damaged blower for labor, but had to sink $700 in it.

 

Could have brought it to Detroit Auto Rama could of checked it out in Parking lot. Lot of rodders there.

 

O-psi is always valve bent, or hole in piston
Broken rings make pressure.

Your finding problem, good.

 

Brandon verified the valves are sealing with gas.
I don’t think zero compression could be had with a bad ring/worn hole, could it, if the valves are sealing? I think (again think) it’s possible the cam timing isn’t correct, and even really think the valves were not adjusted properly.
But I do have a friend who pulled his heads for a valve job for a miss he couldn’t find.
He still had the miss after the heads were back on.
Plug wires on the wrong plugs.

 

Zero is a massive leak, piston if valves are OK.

Multiple top, intermediate rings produce some psi. ZERO is hard to create. HARDWARE. Pull piston, cast, might be porus... forgot to ask, piston is reaching TDC... bent rod Q.

 

I get ya, but kind of a stretch there.
Odd thing is “fired up and idled fine” if I recall correctly.

 

I bought a 283 (sold as fresh, running) for a mild blower build, 2cyl had zero, 2 around 50, pulled it down, rusted cyl, had stuck rings, gasket material under valve faces, a real screw job. Rebuilt it, honed, Runs great now carbureted.

 

I poured fuel onto the valves, no leaks detected and I let it sit there awhile. And I admit, I got too eager and pulled the head before totally loosening up the rockers and did a comp test. I might throw the head back on and see if I get any pressure from #1 with no pushrods on the rockers.

 

Shame you pulled it down, but not as bad as if you had pulled the engine out and began total rebuild.
I'd put the heads back on with the same gaskets (if they look undamaged?) and torque them down. Then adjust all the valves at zero lash before doing another compression test. If compression comes back good on all cylinders then buy new head gaskets and install them, and do a proper valve adjustment.

 

Not a bad idea...

 

They are stock 5.0 pistons.
From 86-91 Ford used TRW forged, from mid 91 Ford used Hypereutectic
The junkyard method to tell is look at the colour of the oilpan [Black=Forged, Grey= Hypers]

Twisted Wedge heads use stock pistons, they were clever by moving the valve location/angle so the pistons didn't get romantically involved with the valves

Just run some Loctite around the fire ring of the old head gasket and re-install [wait an hour or so]
Then compression test number one again.
This saves buying a new head gasket just to do the compression test.

If all is OK , then replace the gasket on the final install
I would adjust the lifters with no preload [or 0.010" lash] for the compression test

 

Carb too small more than likely