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Author
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Topic: 1.7 vs 1.6 for a tfs1 cam
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Jaejae5.0
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Member # 7958
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posted
 
 
already have the 1.6's would i benefit from 1.7's?
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1987 notchback h/c/i 302 & 70mm turbo SOLD
2000 camaro ss cam only
Posts: 4890 | From: the combustion chamber | Registered: Oct 2007
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Captain Obvious
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Member # 7842
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posted
will it clear your pistons? are they notched or aftermarket?
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It's NOT illegal. It's just frowned upon, like masturbating on an airplane.
Posts: 1976 | Registered: Aug 2007
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Jaejae5.0
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Member # 7958
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posted
not sure asking you guys ![[Wink]](wink.gif) ..stock pistons
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1987 notchback h/c/i 302 & 70mm turbo SOLD
2000 camaro ss cam only
Posts: 4890 | From: the combustion chamber | Registered: Oct 2007
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wilit
Mustang Messiah
Member # 3367
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posted
You have to check to see if they clear. No one here ('cept for maybe Duncan Motors) knows how your motor is built.
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"If a man hasn't found something worth dying for, he isn't fit to live." - Martin Luther King Jr.
Posts: 4793 | From: 37.78514° North 122.40100° West | Registered: Oct 2003
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JohnB
Tech Moderator
Member # 969
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posted
Stock shortblock, GT40 heads, .043 head gasket, and that cam with 1.7's will leave you with .125-.130 clearance exhaust side...enough to live, as long as your springs are up to the task. Doublecheck to make sure your valve guides/guide seals aren't bottoming out on the spring retainers. This is a common problem with GT40's and any cam lift over .540.
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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Jaejae5.0
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Member # 7958
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posted
quote:
Originally posted by JohnB:
Stock shortblock, GT40 heads, .043 head gasket, and that cam with 1.7's will leave you with .125-.130 clearance exhaust side...enough to live, as long as your springs are up to the task. Doublecheck to make sure your valve guides/guide seals aren't bottoming out on the spring retainers. This is a common problem with GT40's and any cam lift over .540.
thats what i was really worried about john..duncan has mentioned that to me before..the valve springs are good up to .542
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1987 notchback h/c/i 302 & 70mm turbo SOLD
2000 camaro ss cam only
Posts: 4890 | From: the combustion chamber | Registered: Oct 2007
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nitrous_bob
CAFords OG
Member # 77
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posted
tfs told me i'd hit with my 1.9/1.6 eddy heads using a 1.7 rocker for sure, and that i should clay them even with 1.6 rockers on that cam. thats the 200001 or whatever right ?
i'd call them and ask.
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5.0 OG since 1990
Posts: 1402 | From: st clair shores MI | Registered: Nov 2000
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copcar
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Member # 10113
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posted
The 1.7/Stage 1 cam is a known combination but no matter what check your clearances. Also, your heads do not flow any better at the lift the Stage 1 is providing with 1.6's versus 1.7's. Typically, even with a spot on port and valve job the GT40's cap out around 520 lift. I just don't think you will get your hp/dollar worth by installing them. Typically that combo is seen on FAC 170's, AFR 185's and 165's. The GT40 valve springs will handle the lift just fine, however due to the ramp rate of that cam I would keep the revs under 6500. It is very easy to float a valve with that cam and those springs if you are not careful.
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12.37@ 109.34.NA 894DA Old Nitto 555 DR's Gt40 irons. B cam/1.7's, All emissions equipment on the car, stock air box. UPR catted X pipe.
Posts: 485 | Registered: Jun 2010
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Jaejae5.0
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Member # 7958
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posted
quote:
Originally posted by copcar:
The 1.7/Stage 1 cam is a known combination but no matter what check your clearances. Also, your heads do not flow any better at the lift the Stage 1 is providing with 1.6's versus 1.7's. Typically, even with a spot on port and valve job the GT40's cap out around 520 lift. I just don't think you will get your hp/dollar worth by installing them. Typically that combo is seen on FAC 170's, AFR 185's and 165's. The GT40 valve springs will handle the lift just fine, however due to the ramp rate of that cam I would keep the revs under 6500. It is very easy to float a valve with that cam and those springs if you are not careful.
the heads have been ported pretty much to the max,they have upgraded trickflow valve springs,hardend valve seats,3 angle valve job..
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1987 notchback h/c/i 302 & 70mm turbo SOLD
2000 camaro ss cam only
Posts: 4890 | From: the combustion chamber | Registered: Oct 2007
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Stan G
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Member # 6226
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posted
I doubt you will see 5 additional hp.
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1985 RX-7, 347/T-5 , T/F T/W heads, typhoon intake, Tfs2 cam, pulleys, 2500 lbs .
3.63 rear gears , Megasquirt
Posts: 105 | From: Sun Coast , Florida | Registered: Nov 2005
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