1.7 Rocker Arm question

CManT1914

New Member

Feb 5, 2004

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Killeen, Texas

Jun 18, 2005

#1

• Jun 18, 2005

• #1

The TFS Twisted Wedge heads say maximum recommended lift is .540". The TFS Stage 1 cam has .499" intake lift and .510" exhaust lift with factory rocker arms (1.6). With 1.7 rocker arms this puts exhaust lift at .5418". I just want to make sure this isn't going to work, since I have a line on used 1.7 rocker arms, AND the Stage 1 cam for real cheap. Which way should I go? I can always just get 1.6 rocker arms, and get the cam for cheap, but I'll have to buy the rocker arms new. Or I can get a slightly milder cam, such as the Crane 2040 which has .498" of lift (intake and exhaust) and get the 1.7's for cheap, but I'll have to buy the cam new. What do you guys think?

 

cavscout371

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Mar 30, 2005

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Jun 18, 2005

#2

• Jun 18, 2005

• #2

Mine works fine and I've ran it to 6k several times and I'm on a stock block with 130k miles on it and havent spanked a valve.

Go for it get the 1.7's

 

cavscout371

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Mar 30, 2005

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Jun 18, 2005

#3

• Jun 18, 2005

• #3

I bought my heads the kit they sell which has upgraded valve springs whats the PN# on your heads?

 

CManT1914

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Feb 5, 2004

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Killeen, Texas

Jun 18, 2005

#4

• Jun 18, 2005

• #4

cavscout371 said:

I bought my heads the kit they sell which has upgraded valve springs whats the PN# on your heads?

Click to expand...

I'm probably gonna buy some used ones from a guy, I'm not sure on the part number on those. But I think they are the same as these on summit: http://store.summitracing.com/default.asp?target=partdetail.asp&part=TFS-51400002&FROM=MG

 

cavscout371

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Jun 18, 2005

#5

• Jun 18, 2005

• #5

Ok the ones in my kit are pn#TFS-51400004 I think the only difference is the valve springs though

 

CManT1914

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Feb 5, 2004

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Killeen, Texas

Jun 18, 2005

#6

• Jun 18, 2005

• #6

cavscout371 said:

Ok the ones in my kit are pn#TFS-51400004 I think the only difference is the valve springs though

Click to expand...

Right, those say something about dual springs per valve. What's that all about?

 

cavscout371

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Mar 30, 2005

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Jun 18, 2005

#7

• Jun 18, 2005

• #7

Its 0.600 lift with those dual springs also dont forget your going to have to buy different length pushrods when you go with those heads.