New cylinder head

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cmm24601
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New cylinder head

Post #1 by cmm24601 » Wed Sep 13, 2017 10:37 pm

Just purchased a 1970 cylinder head to replace the head on my 1969 250.

I'll take it to a machine shop for a valve job, but is there a good tutorial on installing it?
1969 Mustang Grande
250 inline 6
Automatic Transmission
Autolite 1101 Carb

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Econoline
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Re: New cylinder head

Post #2 by Econoline » Thu Sep 14, 2017 2:09 am

If it still has 62cc chambers you're going to want to have it milled .025" or so to keep the compression @ 9:1 with a new thicker composite gasket. It's good to get a couple of bolts from the hardware store or old head bolts and cut the heads off of them to use as guides when putting the head back on the new gasket. Other than that and having the deck good and clean, there's just torque sequence from the center out in a circle with 3 progressive intervals to the final torque.

ci/SmallSixSpecs.html#TorqueSpecs
Respectfully,

Seth

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Re: New cylinder head

Post #3 by CZLN6 » Thu Sep 14, 2017 9:18 am

Howdy:

FYI- The '69 and '70 heads are virtually the same casting. what's the point of this change?

Adios, David
co-author of the Falcon Performance Handbook
http://www.falcon6handbook.com/

cmm24601
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Re: New cylinder head

Post #4 by cmm24601 » Thu Sep 14, 2017 10:25 am

My current head is pretty beat up. Crack on the intake manifold, threads broken at the ends where the exhaust manifold mounts. And i have a persistent vacuum leak. I found this 70 head for a decent price and it's in better shape.
1969 Mustang Grande
250 inline 6
Automatic Transmission
Autolite 1101 Carb

drag-200stang
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Re: New cylinder head

Post #5 by drag-200stang » Thu Sep 14, 2017 11:12 am

When using guide pins,use the passenger front and rear bolt holes. The holes in the head and gasket are made smaller at those locations for that alignment purpose.
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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Re: New cylinder head

Post #6 by drag-200stang » Thu Sep 14, 2017 11:24 am

Do not forget to use sealer on the front passenger bolt , it is open to the water jacket...If using studs make sure you clear the water pump impeller at that location.
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: New cylinder head

Post #7 by ags290 » Thu Sep 14, 2017 11:54 am

X2 on the thread sealer for the front bolt. X2 on getting the head milled to compensate for the thicker head gasket. Make sure that when you add coolant back to the system that you get all of the air out. I had to end up getting help from the forum to finally get the last of the air to purge. The trick was to to get the nose of the car elevated when refilling the system.

Good Luck

Kevin
Kevin
Early 1965 Mustang with a 170

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chad
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Re: New cylinder head

Post #8 by chad » Thu Sep 14, 2017 2:00 pm

there's an oil passage to examine after milling too...
Y not get all the install tips & a lot more from the "Handbook" (see Matt at vintage inlines dot com - aprox $25) and while waiting for delivery see our "Tech Archive" (for free - above by clicking on it)? Can't go wrong w/these sources. If U do...
we're all ways here with a guiding hand!
"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", etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

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wsa111
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Re: New cylinder head

Post #9 by wsa111 » Thu Sep 14, 2017 3:08 pm

Man, you guys got it down pat. Best of luck on the swap.
67 mustang,C-4, with mod. 80 hd, custom 500 cfm carb with annular boosters, hooker headers, dual exh.-X pipe, flowmaster mufflers, duraspark II dist. with MSD-6AL. Engine 205" .030" over with offset ground crank & 1.65 roller rockers. 9.5 comp., Isky 262 cam.
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Re: New cylinder head

Post #10 by CZLN6 » Thu Sep 14, 2017 4:23 pm

Howdy Back cmm and all:

Ahh, I get it now. FYI the stock head gasket is .025" thick. The new composite gasket that you will get in a valve job gasket set is approximately .050". To maintain stock compression ratio, you will need to have the head milled .025".If you would like some very inexpensive torque you might want to consider milling the head even more; say .050" for an increase of a half a point more CR. I say inexpensive because the milling will cost just a bit more, you will need to re-establish the oil transfer slot and you may need washers on the head bolts to keep them from bottoming out.

Questions? Keep us posted.

Adios, David
co-author of the Falcon Performance Handbook
http://www.falcon6handbook.com/

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chad
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Re: New cylinder head

Post #11 by chad » Thu Sep 14, 2017 6:29 pm

chad wrote:there's an oil passage to examine after milling too...


"...re-establish the oil transfer slot…"
like he said!

Ck out da Handbook
8^ )
"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", etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

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Econoline
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Re: New cylinder head

Post #12 by Econoline » Thu Sep 14, 2017 10:08 pm

I'm glad you guys remembered the goop on the front bolt in the water jacket, very important! I knew I was forgetting something

Op, while you have the head off you should measure the deck clearance on the #1 and #6 cylinders and cc the new head and then you can dial in the compression to 9:1-9:3. It's worth the effort.
Respectfully,

Seth

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