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Author Topic: whats the maximum lift a stock piston Gt40 heads engine can take?  (Read 2365 times)
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« on: February 13, 2012, 03:07:53 pm »

i have a .512 lift cam now with stock 1.6 rockers i want to upgrade to roller rockers.. is it worth it? and if its worth it i wanna go with 1.7 rockers then to give it a little more lift for  a little more power
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--==Jurgen==--
1989 F150 reg cab longbed
5.0 HO, Comp cam 35-351-8 , Flowtech LT's, hooker aero chambers, GT40 heads, Edelbrock Air Gap Performer intake, Holley 650dp Carb, C4 shift kit, edge racing converter, B&m shifter.

Joel5.0
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« Reply #1 on: February 13, 2012, 03:47:42 pm »

Please read http://sbftech.com/index.php/topic,57.0.html . Piston type and maximum valve lift do not correlate. Max lift is usually 102° - 118° ATDC or BTDC (intake and exhaust respectively) or when the piston is >60% of the stroke under the deck.

FYI.... my junk has used a X-303 with 1.72 rockers (.583" lift) with stock pistons and '66 52-50cc 289 heads for years.
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'86 Mustang GT, X-303 cam, Holley DP 700, RG Tran., 289 Heads   Ford Smilie 2


Quote from: Joel5.0
The right to be stupid is inalienable for sure however, there is no such thing as a right to impose stupidity onto others
Great Thoughts will Overwhelm a Feeble Mind
There is never money to do it right, but there's always money to do it over.
Knowledge based on external evidence is unreliable.
He, who doesn't ask, does not deserve an answer.
A mind is like a parachute it only works when it is open.  (oldmanjoe)
If you can't explain it simply, you don't understand it well enough. (Albert Einstein)
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I can explain it for you, but I can't understand it for you. (90lxcoupe)
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Ignorance is bliss, but stupidity is orgasmic.
Fraud and falsehood only dread examination. Truth invites it. (Samuel Johnson)
The chaotic resistance of the opponents leads to the conclusion that they are not prepared to meet the challenge. The problem is already much more psychological then technological. [Bojidar Djordjev]
Individuals are rational and humane... Crowds are reactionary and barbaric. (Jason)
The person who says it cannot be done should not interrupt the person doing it. –Chinese Proverb
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« Reply #2 on: February 13, 2012, 07:09:41 pm »

i really dont wanna take apart the engine just for bigger rockers... 

this is the cam i have
http://www.summitracing.com/parts/CCA-35-351-8/

and is roller rockers a good upgrade??
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--==Jurgen==--
1989 F150 reg cab longbed
5.0 HO, Comp cam 35-351-8 , Flowtech LT's, hooker aero chambers, GT40 heads, Edelbrock Air Gap Performer intake, Holley 650dp Carb, C4 shift kit, edge racing converter, B&m shifter.

Joel5.0
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Location: Puerto Rico
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« Reply #3 on: February 13, 2012, 08:00:20 pm »

Roller rockers is always a good upgrade.... add the step-up, and it makes it more useful and a little more cost effective. 
Logged

ACRONYMS:
LUK  LMK  JIC  BTSTDTRT  YCYDYP  NFI-YTM  SPOBI, and the classic... DILLIGAS

'86 Mustang GT, X-303 cam, Holley DP 700, RG Tran., 289 Heads   Ford Smilie 2


Quote from: Joel5.0
The right to be stupid is inalienable for sure however, there is no such thing as a right to impose stupidity onto others
Great Thoughts will Overwhelm a Feeble Mind
There is never money to do it right, but there's always money to do it over.
Knowledge based on external evidence is unreliable.
He, who doesn't ask, does not deserve an answer.
A mind is like a parachute it only works when it is open.  (oldmanjoe)
If you can't explain it simply, you don't understand it well enough. (Albert Einstein)
Tuning on a Dyno for the track, is like swim practice in a bathtub.
I can explain it for you, but I can't understand it for you. (90lxcoupe)
The proof of understanding is the ability to explain it. (H. Torruella)
Ignorance is bliss, but stupidity is orgasmic.
Fraud and falsehood only dread examination. Truth invites it. (Samuel Johnson)
The chaotic resistance of the opponents leads to the conclusion that they are not prepared to meet the challenge. The problem is already much more psychological then technological. [Bojidar Djordjev]
Individuals are rational and humane... Crowds are reactionary and barbaric. (Jason)
The person who says it cannot be done should not interrupt the person doing it. –Chinese Proverb
Nothing sways the stupid more than arguments they can't understand - Cardinal de Retz
F150 Cobra
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****
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Posts: 411


Location: Aruba

« Reply #4 on: February 14, 2012, 08:19:16 am »

So go with the 1.7's? And wich is a good set? Comp ? Ford racing? Crane? Scorpion? Etc.
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--==Jurgen==--
1989 F150 reg cab longbed
5.0 HO, Comp cam 35-351-8 , Flowtech LT's, hooker aero chambers, GT40 heads, Edelbrock Air Gap Performer intake, Holley 650dp Carb, C4 shift kit, edge racing converter, B&m shifter.

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