dual pattern cams

Dark Knight · 05-20-2006, 06:59 PM

Where did the rocker break?

woodsnake · 05-21-2006, 10:58 PM

THe rocker broke right behind the stud (7/16) around the 'side' kind of. On the end that faces the spring, almost in half. I'm thinking I broke more than a rocker to do that much damage. Tomorrow I'm going to see if I can rent a space to tear the head off, and see what's what.

Dark Knight · 05-22-2006, 04:21 AM

If you damaged the valves, a compression test will show it without having to pull the head. Breaking a rocker arm usually means something bound up. Check the condition of the rocker stud too. Also make sure you put the rocker arm on right, I've seen people put the rocker arm on wrong, trunion facing the wrong way. Make sure the poly lock is in the right side of the trunion.

woodsnake · 05-22-2006, 10:17 AM

I'm also afraid that the gas in the tank may have been bad as well. I think what happened this time is that this one valve varnished and got sticky, thus causing the piston to hit the valve and break the rocker. I'm too deep into the project to quit now, off comes the head, back to the machine shop. Plus a new piston....(probably)

Dark Knight · 05-22-2006, 12:56 PM

Do a compression test... and if one hit and broke the rocker, why did the other pushrods bend? Did you check for coil bind right after the car was running, or after it sat for awhile? The lifters will bleed down if it sits.

05-20-2006, 06:59 PM	#1
Dark Knight Registered Member Join Date: Oct 1998 Location: Az Posts: 854	Re: dual pattern cams Where did the rocker break? __________________ 84 convt,roller 302,AFR's, performer 3.55's, underdrives BBK shorties stock cam, 1.7's 13.58@102.84 and a '68 stang .. project 8 sec street car... 557 big block + N20 :-) http://members.cox.net/darkknight302/68nwrear.jpg

05-21-2006, 10:58 PM	#2
woodsnake woodsnake Join Date: May 2006 Location: Nampa, Id Posts: 17	Re: dual pattern cams THe rocker broke right behind the stud (7/16) around the 'side' kind of. On the end that faces the spring, almost in half. I'm thinking I broke more than a rocker to do that much damage. Tomorrow I'm going to see if I can rent a space to tear the head off, and see what's what. __________________ Disclaimer!! All info provided by the woodsnake is free, and worth what it costs!! Use with caution What can I say, I like Cougars... " yer darn right wow " http://woodsnake4462838.tripod.com/68_part_2 http://woodsnake4462838.tripod.com/cougars_at_rest/

05-22-2006, 04:21 AM	#3
Dark Knight Registered Member Join Date: Oct 1998 Location: Az Posts: 854	Re: dual pattern cams If you damaged the valves, a compression test will show it without having to pull the head. Breaking a rocker arm usually means something bound up. Check the condition of the rocker stud too. Also make sure you put the rocker arm on right, I've seen people put the rocker arm on wrong, trunion facing the wrong way. Make sure the poly lock is in the right side of the trunion. __________________ 84 convt,roller 302,AFR's, performer 3.55's, underdrives BBK shorties stock cam, 1.7's 13.58@102.84 and a '68 stang .. project 8 sec street car... 557 big block + N20 :-) http://members.cox.net/darkknight302/68nwrear.jpg

05-22-2006, 10:17 AM	#4
woodsnake woodsnake Join Date: May 2006 Location: Nampa, Id Posts: 17	Re: dual pattern cams I'm also afraid that the gas in the tank may have been bad as well. I think what happened this time is that this one valve varnished and got sticky, thus causing the piston to hit the valve and break the rocker. I'm too deep into the project to quit now, off comes the head, back to the machine shop. Plus a new piston....(probably) __________________ Disclaimer!! All info provided by the woodsnake is free, and worth what it costs!! Use with caution What can I say, I like Cougars... " yer darn right wow " http://woodsnake4462838.tripod.com/68_part_2 http://woodsnake4462838.tripod.com/cougars_at_rest/

05-22-2006, 12:56 PM	#5
Dark Knight Registered Member Join Date: Oct 1998 Location: Az Posts: 854	Re: dual pattern cams Do a compression test... and if one hit and broke the rocker, why did the other pushrods bend? Did you check for coil bind right after the car was running, or after it sat for awhile? The lifters will bleed down if it sits. __________________ 84 convt,roller 302,AFR's, performer 3.55's, underdrives BBK shorties stock cam, 1.7's 13.58@102.84 and a '68 stang .. project 8 sec street car... 557 big block + N20 :-) http://members.cox.net/darkknight302/68nwrear.jpg

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