87 "coug" resto winter project

Topic: 87 "coug" resto winter project (Read 104531 times) previous topic - next topic

87 "coug" resto winter project

Reply #270 – June 03, 2017, 10:03:47 PM

these gents here in the USA

http://liberty-engine-parts.com/

most of thier stuff is made here, few off s.

87 "coug" resto winter project

Reply #271 – June 04, 2017, 02:32:09 PM

my attempt at a camfer on the tops of the cylinders. I was going to make a cone tool then it occured to me that if i trap the cylinder hone stones at a certain pitch with painters tape, that will allow me to trasfer that profile to the individual bores.
seems to have worked out ok

in short order you will see you are going to use up your stones ,,, this is all i had lying around that would get me past this step quickly , evenly and in a mechanically sound way.

87 "coug" resto winter project

Reply #272 – June 04, 2017, 07:40:25 PM

pistons went in much easier now.
I'm one fry short of a happy meal till i figure out where i am going to get one single compression ring from.

i was surprised i had no block conflicts with the 331 kit,, some people say they had to grind away parts of the block or crank to clear rotating parts.

all clear here.

87 "coug" resto winter project

Reply #273 – June 05, 2017, 03:17:04 PM

got me a .045 over 4'' lower ring, will grind it down and set it up for cyl 7 then have all 8 in place

87 "coug" resto winter project

Reply #274 – June 08, 2017, 10:18:15 AM

Tech help please

See attached two pictures so you can get your head around the the final question I have..

-heads without HG mocked up on block
-Cyl #1 at TDC
-dial indicator set up w/ magnetic base as shown
-I am physically hitting the top of the piston with my INT valve at .217’’

Cam info (stock ford HO cam) for 86-88 fox bodies
-INT valve lobe base circle is 1.440’’
-int valve base to top of lobe is 1.718’’
I subtract the two values above and arrive at the max lobe height as .278

Lifter Info
-better than stock “by design” regular Hyd roller lifters.

Will my PTV clearances be fine?
How much travel does a stock hyd lifter use up internally before its mechanical effort finally starts to move the valve down?
I cant remember the seat pressure on the valve springs but I am certain they exceed 130lbs

87 "coug" resto winter project

Reply #275 – June 08, 2017, 11:22:48 AM

I usually just use a piece of clay. Seems like a complicated setup to me.

87 "coug" resto winter project

Reply #276 – June 08, 2017, 12:38:33 PM

I'm no engine guy, but the few times I have done this I have the cam, pushrods, and rockers installed and use a solid mock up lifter to check the piston to valve clearance. Maybe the advertised cam lift is what you are basing this on but not sure if that translates to exact numbers depending on the rocker ratio etc????

87 "coug" resto winter project

Reply #277 – June 08, 2017, 12:47:07 PM

no timing gears in so its all pretty simple with a magnetic dial indicator base.

i know my process for what the overall clearance is.. is different because im not using a degree wheel.

how much do i subtract for the lifter loss?
the lifter will collapse an amount before it actually opens the valve.

87 "coug" resto winter project

Reply #278 – June 08, 2017, 01:53:23 PM

I think so on the degree wheel. I don't think the valve would be at full lift when the piston is at tdc. The question is where would the piston be when the valve is at full lift, hence the mock up with the cam, pushrods, rocker arms, etc that you are going to use. I also used clay to check the clearance with this method. Not sure I would subtract anything for lifter loss. If it were me, I would do the full mock up. Hopefully someone with more engine building experience will chime in.

87 "coug" resto winter project

Reply #279 – June 08, 2017, 09:18:29 PM

Take an old lifter and gut it. There are instructions on sbftech.

http://sbftech.com/index.php?topic=57.0

87 "coug" resto winter project

Reply #280 – June 11, 2017, 10:37:31 PM

clay without head gasket says .068''.

now i gotta find a woodruff key for my crank, seems like scat assumes you dont need a new one.

87 "coug" resto winter project

Reply #281 – June 11, 2017, 10:42:09 PM

is there an option for slightly taller than stock valve covers for the 5.0L?

i dont want to use the ford racing ones i have because they are too tall.

i am going to have to have .25'' cut off my roller rocker retainer nut to shorten the hight profile.
if i cut the retainer nuts,, the stock valve covers will clear with a very very thick vc gasket perhaps.
maybe i will use two gaskets or an adaptor of some sorts meant to cure this issue when running studed heads.

87 "coug" resto winter project

Reply #282 – June 12, 2017, 02:15:15 PM

I run these: https://lmr.com/item/M6000C302/86-93-Mustang-50L-Ford-Racing-Black-Cobra-Valve-Covers

They clear roller rockers and fit under a stock style upper intake.

You can run stock cast aluminum HO valve covers and roller rockers by grinding the casting bosses off on the inside.

87 "coug" resto winter project

Reply #283 – June 13, 2017, 09:53:20 AM

thanks, before new, will try used if anyone has any as i have posted in the wanted ads.

i have several listings in there for stuff if someone wants to get some $

87 "coug" resto winter project

Reply #284 – June 15, 2017, 02:54:27 PM

took apart the heads and replaced seals and cleaned up valves / seats. lots of rich looking crud but all is well now.
intake guide on #7 offeres little reistance suction wise when i pull on the valve and cover the guide opening on the other end but.... it feels ok and tight so im gonna let it go for now.