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Author
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Topic: Pistons up too far?
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stang106
Gearhead Posts: 698
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 05-01-2002 03:57 PM
  
On my 351W the pistons measure 0.018 - 0.020 above deck. Is this too high and what are my options if it is? Heads are World Jr's and I'm running a solid cam 0.585 lift.
Thanks,
Dave
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Moneymaker
Administrator Posts: 18280
From: Lyons, IL, USA
Registered: May 99
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posted 05-01-2002 09:24 PM
You will need at least a .055 thick head gasket. Get some and then check piston to valve clearance.  ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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stang106
Gearhead Posts: 698
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 05-01-2002 11:21 PM
Alex,
I put the head on the Fel-pro gasket and used 30 ftlbs. At this the gasket height was .045" On the highest piston- 0.018- I put some of my daughter's play-dough in and installed the valvetrain, slowly tightening until I had 0.012 lash. Engine turned over fine... I had put the playdough in the wrong valve-releases. After getting it right, there was a mark in the exhaust side with about 0.125 clearance and lots more on intake- less lift. Also the roller rocker pattern is more to the center of the engine than the middle. Is all this OK? Should I still get 0.055 gaskets? copper?
Thanks,
Dave[This message has been edited by stang106 (edited 05-01-2002).]
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Moneymaker
Administrator Posts: 18280
From: Lyons, IL, USA
Registered: May 99
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posted 05-02-2002 10:10 AM
.125 is plenty. Roller rocker pattern???
Please explain. ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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stang106
Gearhead Posts: 698
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 05-02-2002 10:51 AM
You tell me the technical term.
Can I e-mail you a pic of the mark that the roller rocker makes on the valve tip Alex? I was trying to avoid having to buy custom length pushrods.
Thanks,
Dave
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mustangboy
Gearhead Posts: 462
From: Ont, Canada
Registered: Mar 2002
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posted 05-05-2002 03:06 AM
If I understand you right you mean the rockers are towards the intake manifold side of the valve stem centreline.This means your pushrods are a little long.As long as they are not coming off the edge of the valve stem I think they will work ok.
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V8 Thumper
Gearhead Posts: 2830
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 05-05-2002 03:58 AM
http://www.dragnbreath.com/dragnbreath/TechNotesA/TN9RolRocGeom.html
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stang106
Gearhead Posts: 698
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 05-07-2002 02:05 AM
Thanks for the article, but it does seem a little involved; I like the "looks a little long" method! When I mocked up the heads and valvetrain I was only using 0.012" lash and the roller mark was from about the center of the stem and towards the lifters. However, I measured the head gasket crush and it was 0.045" and I have ordered 0.0595" gaskets so the rocker will be a little higher. I do this again after the heads are torqued down. Also I am a little worried about how much movement the rocker has- enough to move the roller about 50% off the stem, Is this normal or are my guide plates too wide?
Dave
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