Engine GURU's ....a Question ?
Thread Starter
Racer
Joined: Oct 2009
Posts: 441
Likes: 2
From: San Antonio TX
Engine GURU's ....a Question ?
On another post a feller was askin about getting more HP out of his L-48 ....
I was thinking replace the 1.5 ratio stock rocker arms with 1.7 Roller Rockers ???
What are the stock cam specs on a '76 L-48 ??? ...what would this come out to by just changing over to 1.7's ???
I was thinking replace the 1.5 ratio stock rocker arms with 1.7 Roller Rockers ???
What are the stock cam specs on a '76 L-48 ??? ...what would this come out to by just changing over to 1.7's ???
Racer
Joined: Oct 2006
Posts: 435
Likes: 18
From: Florida
I dont think a 1.7 is available without machine work. There are 1.65, 1.6, 1.55, 1.52 and 1.5 rockers that bolt on. You must be careful as this increases the load on everything and can possibly cause instability with the valve train by just swapping in the biggest ratio possible. They generally dont gain a bunch of power, but can be used to optimize the combination by playing with different ratios on the intake and the exhaust. It really points to the inadequacy of the cam though.
P.S. Answering this question does not make me a guru......
P.S. Answering this question does not make me a guru......
Team Owner
Joined: Oct 2004
Posts: 81,241
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From: altered state
St. Jude Donor '05
Race Director
Joined: Apr 2000
Posts: 17,672
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
I dont think a 1.7 is available without machine work. There are 1.65, 1.6, 1.55, 1.52 and 1.5 rockers that bolt on. You must be careful as this increases the load on everything and can possibly cause instability with the valve train by just swapping in the biggest ratio possible. They generally dont gain a bunch of power, but can be used to optimize the combination by playing with different ratios on the intake and the exhaust. It really points to the inadequacy of the cam though.
P.S. Answering this question does not make me a guru......
P.S. Answering this question does not make me a guru......
I believe he said something like, you have a street roller cam designed to work and live on the street with lower spring pressures, now you want to put on 1.7 rockers and basically defeat the purpose of the design of the cam because you will need different springs and spring pressures, putting more stress on everything, he told me to forget about it.
If you are thinking about putting 1.7 rockers on a stock L48, well...don't
Last edited by MotorHead; Feb 7, 2010 at 11:46 PM.
