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Author
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Topic: what am i doing wrong
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stoker
Gearhead Posts: 155
From: folsom,cal,
Registered: Jan 2002
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posted 02-16-2003 08:30 PM
   
this is second time i have had intake to head gasket failure(intake gasket splits at top or bottom of port causing vacumm leak)i have been ussing felpro#1250 (which barely fits AFR 185 port).i think i will try #1262 this time. i follow felpros directions,it seems like they are being stretched till they break.could this be attributed to aluminum heads and iron block?i am only gettin around 1k miles per set of gaskets.help
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Fastymz
Moderator Posts: 14201
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 02-16-2003 08:44 PM
The 1262 gasket has a larger port area.The last set I had on my 351w was the 1250 model I noticed when I removed the intake to of the middle ports were torn.
The 1262 fits the ports even on my stock heads better.Are you using anything to hold the gasket to the heads before you install the intake?
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SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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Fastymz
Moderator Posts: 14201
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 02-16-2003 08:51 PM
Alex posted some time ago,how he installs intake gaskets.And he said he's never had a leak.I can't seem to be able to find that post anywere.------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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stoker
Gearhead Posts: 155
From: folsom,cal,
Registered: Jan 2002
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posted 02-16-2003 09:23 PM
scoop,iam glueing gaskets to head with edelbrock yellow glue letting it set up,trim waterports as needed then torque it down.i am real puzzled on this one!!
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Buster
Gearhead Posts: 1238
From: Orlando
Registered: May 2002
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posted 02-16-2003 09:31 PM
"scoop,iam glueing gaskets to head with edelbrock yellow glue letting it set up"Yikes, I don't use that yellow stuff for anything, but that?s just me. Contact spray gasket to manifold and black silicone front & back manifold to block after cleaning very good with brake cleaner.
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stoker
Gearhead Posts: 155
From: folsom,cal,
Registered: Jan 2002
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posted 02-16-2003 09:46 PM
thanks for reply,but ussing your method,wouldnt you have to worry about gaskets alighning with head ports?
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Moneymaker
Administrator Posts: 21725
From: Lyons, IL, USA
Registered: May 99
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posted 02-16-2003 09:51 PM
OK, here ya go one more time. 
1250 or 1262 Fel-Pro intake gasket installation proceedures.
1)Clean all head, intake and intake end runner surfaces with carb cleaner or brake clean.
2)Lay a 1/4 inch bead of silicone sealer (anything but blue) along each intake runner cylinder head to cylinder head. Both front and back.
3)Lay a 1/8 inch bead of silicone around each water port of each head.
4)dab some silicone lightly around each intake port.
5)With your finger smooth the silicone down around the water and intake ports.
6) Lay the intake gaskets and pat down on heads.
7) Let stand for about 5 minutes.
8)Dab a very light amount of silicone around each intake and water port on top of the gaskets.
9) Install intake manifold lining up the ports via the carb plenum
10) Install intake bolts and cross tighten side to side from the inside out. Tighten in small increments until you can't pull the bolts down anymore. Do not use anyting larger than a 3/8 ratchet and extension.
If you have a torque wrench, then torque to 35 foot pounds.
11)Install carb, linkage, fuel line etc.
You know the rest.
Do it this way and you'll never have a leak ever again. ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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Buster
Gearhead Posts: 1238
From: Orlando
Registered: May 2002
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posted 02-16-2003 10:51 PM
Do you know the history of the head and intake? have they been cut that you know of???It almost sounds like you getting the intake too tight... I never have intake problems as far as leaks go.... I think the intake I am using is not right either.. one side I need to tighten more then the other. I, like Alex, tighten the intake to 35 foot pounds. But, I don't put silicone anywhere other then intake to block. Contact spray is all I use outside of the Silicone. However, I do put silicone on my finger and spread it on the intake and block where they meet, before I lay the silicone bead down. I have found that this works best stopping oil leaks. Do you find that one side or the other of the intake needs to be tighten more then the other side, as you go around tighting the intake? What is your torque settings?
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stoker
Gearhead Posts: 155
From: folsom,cal,
Registered: Jan 2002
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posted 02-17-2003 06:50 AM
thanks guys for all the tips,i need all the help i can get.alex,does 35#s torque apply to alum heads?i just use 1/4 drive ratchet and one hand because of alum.why does color of silicone matter?i usually use permatex blue.buster,my intake is brand new edel.RPM air gap,heads are new AFR (no milling)but my stroker combo required .025 cut off deck of block to get pistons even with it.again,it appears my gaskets are being stretched fore and aft,this time fracturing (if u will)on top and bottom of # two cyl sucking oil and fouling spark plug.funny i never had this prob when i ran iron heads.
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RADRIDE
Gearhead Posts: 270
From: Va.Beach, Va.
Registered: Aug 2002
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posted 02-17-2003 08:58 AM
I am running same thing AFR185,Air-Gap,not a stroker but block decked flat and have had no problems with the 1250 gaskets,so far.Its been together and on street for 4 months tho not a daily driver.I seal water passages but on a clean new surface use nothing.AFR doesnt reccomend torquing them down even so I did to 35 being very careful pulling them down even.I also made studs to hold intake.Couldnt believe ARP didnt make them.
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D&S Induction Systems
Gearhead Posts: 118
From: Columbia Heights Mn U.S.A.
Registered: Feb 2003
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posted 02-17-2003 11:22 PM
It all depends apon what brand and type of gasket you're using. If I have a choice I'll use Fel-Pro. I don't ever use those quark gasket strips that go between block and intake. A bead of silicone is much better if you ask me.
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Moneymaker
Administrator Posts: 21725
From: Lyons, IL, USA
Registered: May 99
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posted 02-17-2003 11:32 PM
I've probably used every brand of intake gasket ever made for a SBF at one time or another. Until Fel-Pro introduced the print-o-seal product I swore by the gray Mr.Gasket gaskets. Even over the premium Victor performance or marine intake gaskets.
But you know what?
I can say I have never had an intake leak as long as the intake matched the heads. Even when I cut the intake too much I always had enough common sense to do some test fitting and double up gaskets if I needed to.
I started doing this sh*t long before there was silicone too!  ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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