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Aluminum Head Woes

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Gene Fiore
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Aluminum Head Woes

Post #1 by Gene Fiore » Sun May 06, 2018 2:27 pm

After what seems like an eternity I was finally to the point of bolting down the aluminum head on my 250. Got the new head gasket and studs installed and torqued the head to specs. Installing the rocker assembly is where things went bad. Got the pushrods in place and rocker assembly in place. Start all rocker bolts by hand and snug down. Then torque them to 35 foot lbs and bamm...the threads in the head underneath the rocker stand at the back end of the motor pull out of the head. WTF! So I pulled everything back off and sure enough the threads are almost gone. :( I sure hope my machinest will be able to fix this. :bang:
1971 Maverick, 250I6, crank knife-edged, Clay Smith 278 solid cam, .040 over 255 V8 pistons, 10.5 to 1, Custom 500 Holley 2V on Classic Inlines Aluminum cylinder head, 1.6 rockers, Hooker header, DUI dizzy, C-4 w/2800 stall, 8" 3.55 det locker

Best ET 1/4 mile: 14.92 at 89.61 mph on 1/12/2013

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chad
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Re: Aluminum Head Woes

Post #2 by chad » Sun May 06, 2018 3:43 pm

Gene Fiore wrote:...and bamm...the threads in the head underneath the rocker stand at the back end of the motor pull out of the head. WTF! So I pulled everything back off and sure enough the threads are almost gone. :( I sure hope my machinest will be able to fix this. :bang:

That'll B the easiest wont it?
The hard prt - to find a fasner that'll work after the machining?

Try'n figure Y it pulled up. I'd hate 2 C U get it fixed'n the others go...
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

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bubba22349
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Re: Aluminum Head Woes

Post #3 by bubba22349 » Sun May 06, 2018 3:44 pm

HI Gene, this should be a very simple repair job using a Heili Coil thread repair kit from your local auto part store like NAPA ect. The kit comes with proper size drill and tap so you only need a hand drill with that kit, but (a drill press gives even better results). When finished the Heili Coil threads will be even stronger and last longer than the original threads in the Aluminum head and the current rocker hold down bolts can be reused if there's no thread damage. Good. Luck :thumbup: :nod: Edited
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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65coupei6
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Re: Aluminum Head Woes

Post #4 by 65coupei6 » Sun May 06, 2018 5:01 pm

I second what bubba said!
...Marco

'65 Mustang Inline 200. VI (CI) Aluminum Head, Holley 350, Schneider 264/274 cam,
Headers, DSII, MSD 6A, and a whole lotta other stuff!

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Re: Aluminum Head Woes

Post #5 by rbohm » Sun May 06, 2018 5:19 pm

gene, i agree with bubba and marco. a good helicoil install should cure the problem, which is probably what your machinist is going to do.
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Gene Fiore
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Re: Aluminum Head Woes

Post #6 by Gene Fiore » Sun May 06, 2018 5:46 pm

That's good news...I plan to give him a call first thing Monday morning. I'd rather have a professional handle this.
1971 Maverick, 250I6, crank knife-edged, Clay Smith 278 solid cam, .040 over 255 V8 pistons, 10.5 to 1, Custom 500 Holley 2V on Classic Inlines Aluminum cylinder head, 1.6 rockers, Hooker header, DUI dizzy, C-4 w/2800 stall, 8" 3.55 det locker

Best ET 1/4 mile: 14.92 at 89.61 mph on 1/12/2013

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Re: Aluminum Head Woes

Post #7 by rbohm » Sun May 06, 2018 7:17 pm

not a bad idea gene if you are not confident in your skills in doing such a repair, or dont have time.
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chad
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stripped threads Aluminum Head

Post #8 by chad » Sun May 06, 2018 7:39 pm

like it as same fastener can B used...

Now, Y did it 'go''? U were not wrking on it @ the time.
Ur tq wrench is in accurate?
U did not follow the recommended procedure on tightening,
it's was a defective pour,
...or...or...or...
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

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Econoline
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Re: Aluminum Head Woes

Post #9 by Econoline » Sun May 06, 2018 9:13 pm

35# is probably overkill for the pedestals. That's around maximum torque for a grade 8 3/8" bolt. And being the aluminum head and the pedestals are aluminum or zinc/white metal 20-25# should do. With washers and locks 15# would probably be a plenty. A couple of the pedestals on my old 170 were distorted pretty badly from being over torqued.
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Gene Fiore
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Re: Aluminum Head Woes

Post #10 by Gene Fiore » Mon May 07, 2018 12:54 am

Econoline wrote:35# is probably overkill for the pedestals. That's around maximum torque for a grade 8 3/8" bolt. And being the aluminum head and the pedestals are aluminum or zinc/white metal 20-25# should do. With washers and locks 15# would probably be a plenty. A couple of the pedestals on my old 170 were distorted pretty badly from being over torqued.

Thanks for the tip...once I get this fixed I'll back off to say 20#.
1971 Maverick, 250I6, crank knife-edged, Clay Smith 278 solid cam, .040 over 255 V8 pistons, 10.5 to 1, Custom 500 Holley 2V on Classic Inlines Aluminum cylinder head, 1.6 rockers, Hooker header, DUI dizzy, C-4 w/2800 stall, 8" 3.55 det locker

Best ET 1/4 mile: 14.92 at 89.61 mph on 1/12/2013

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wsa111
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Re: Aluminum Head Woes

Post #11 by wsa111 » Mon May 07, 2018 9:53 am

Gene, make sure your rocker shaft bolt goes far enough into the threads in the head??? Might need longer bolts. The problem with different bolts is oil supply to the shaft??
67 mustang,C-4, with mod. 80 hd, custom 500 cfm carb with annular boosters, hooker headers, dual exh.-X pipe, flowmaster mufflers, DSII dist. MSD-6al & MSD-Blaster 8252 Coil. Engine 205" .030" over with offset ground crank & 1.65 roller rockers. 9.5 comp., Isky 262 cam.
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drag-200stang
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Re: Aluminum Head Woes

Post #12 by drag-200stang » Mon May 07, 2018 11:00 am

I tried to warn about keeping what you are doing in mind with your fastener torque,. but people kept saying no you have to use the torque that the fastener maker says...Some places you have to think about what you are doing...No blanket torque value.

There are even better inserts that will make the repair better than new...If it is in the budget I would go to studs,.easier on the threads..I have not done this yet but I think it would make installation easier,..slide it down the studs,.. keeping the push rods in place as you go..
Good luck,..get er done.. :thumbup:
Last edited by drag-200stang on Mon May 07, 2018 3:41 pm, edited 1 time in total.
66 Mustang Coupe
200 turbo w/lenco 4-spd
stock adj. rockers, stock timing set, ARP studs
best 1/4 mile ET 9.85/best mph 139 on 8 lbs progressing to 15 lbs boost
Went 9's when 10's was fast.

ags290
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Re: Aluminum Head Woes

Post #13 by ags290 » Mon May 07, 2018 1:31 pm

We have the same problem at the dealership with head bolts pulling the threads out of Northstar Cadillac blocks causing head gasket issues. We use a product called timeserts instead of heli-coils but it is the same principle. This is a factory approved repair, so don't feel bad about using a thread repair kit. I'm sure that your machine shop will get you fixed up. here is a link for the kits on Amazon if yoiu decide to go DIY: https://www.amazon.com/s/ref=nb_sb_noss ... s=timesert
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drag-200stang
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Re: Aluminum Head Woes

Post #14 by drag-200stang » Mon May 07, 2018 3:38 pm

ags290 wrote:We have the same problem at the dealership with head bolts pulling the threads out of Northstar Cadillac blocks causing head gasket issues. We use a product called timeserts instead of heli-coils but it is the same principle. This is a factory approved repair, so don't feel bad about using a thread repair kit. I'm sure that your machine shop will get you fixed up. here is a link for the kits on Amazon if yoiu decide to go DIY: https://www.amazon.com/s/ref=nb_sb_noss ... s=timesert

That is the one I was thinking about :thumbup:

Another problem that I heard about ,..is to much oil in the hole will hydraulic the boss off...That has never happened to me so it mght be hearsay.
66 Mustang Coupe
200 turbo w/lenco 4-spd
stock adj. rockers, stock timing set, ARP studs
best 1/4 mile ET 9.85/best mph 139 on 8 lbs progressing to 15 lbs boost
Went 9's when 10's was fast.

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