Full Answer
What is the maximum lift on a stock Chevy head?
Bone stock Chevrolet, nothing special heads, maximum lift is under .5" I can't say exactly how much I suppose some of it does depend on the head casting but then if they're old heads then that number will change from new specs. Now Vortec heads are capable of .5" and with a little better springs much more.
How much valve lift is too much for a Chevy?
For street performance small block Chevys .550 valve lift is a practical limit. Coil bind, retainer/valve seal interference and pushrod/hole slot clearance are the things you should watch out for. Thanks to ElkyPete, greasy5thwheel and Mrapii.
How much lift on a Vortec head?
Now Vortec heads are capable of .5" and with a little better springs much more. They flow better than any other Chevy Stock head except maybe the fast burn. But basically you're limited to under .5" lift and roughly 6000 RPMs.
How much HP can you add to a stock head?
But basically you're limited to under .5" lift and roughly 6000 RPMs. A good trick for stock heads to add a little better HP is to replace all the Intake rockers with 1.6:1 rockers. It takes you to the edge of the valve lift for stock heads but it helps pack a fuller charge in the cylinder, which gives up more Hp.
What is the lift on a stock 350 cam?
The 350hp/350 cam had . 450/. 460 lift. (GM has a newer version of this cam with less intake duration for use in 9.0 -9.5:1 compression engines.)
How much lift can stock Vortec springs handle?
around 0.420 inchThe factory Vortec heads use a light, single-wire valvespring with a damper that generates between 70 and 80 pounds of load on the seat. Because these heads are meant to work with a 1.5:1 rocker, their tall valve guides can only handle maximum valve lifts of around 0.420 inch.
What is maximum valve lift?
Lift refers to maximum valve lift. This is how much the valve is "lifted" off its seat at the cam lobe's highest point.
How much lift can stock 5.3 springs handle?
the factory springs can only handle about . 500 lift.
How much power can Vortec heads make?
around 350-375 horsepowerJeff Smith: We wrote about Vortec heads in 2016, and that article spawned this question. The original answer was related to modifying the heads to accept more valve lift. Our original answer combined the Chevrolet Hot cam with a set of these Vortec heads. Our estimate then and now is around 350-375 horsepower.
How do I lift more with Vortec heads?
0:377:03How To Run More Lift With Vortec Heads - YouTubeYouTubeStart of suggested clipEnd of suggested clipThey are 26918 springs and then you have the comp cams 787-16 retainers now what these retainers letMoreThey are 26918 springs and then you have the comp cams 787-16 retainers now what these retainers let you do is run a beehive style spring which will allow you to run more lift.
What makes a cam choppy?
Registered. LSA (lobe separation angle) determines the choppiness, it has to do with the overlap of when both valves are open, as in when the exhaust valve is closing and the intake valve is opening to pull fresh fuel in on the intake stroke after pushing out the burnt fuel. Most GM cams come on a 112, 114 or 116 LSA.
Is more valve lift better?
Designing a cam profile with more lift results in increased duration in the high-lift regions where cylinder heads flow the most air. Short duration cams with relatively high valve lift can provide excellent responsiveness, great torque, and good power. But high lift cams are less dependable.
What is a voodoo cam?
Voodoo Cams are engineered to deliver increased area under the lift curve, thus moving airflow through the intake manifold and heads earlier and for longer, which increases power, throttle response, idle vacuum and engine efficiency.
What do upgraded valve springs do?
This allows more of the spring load to control the valve. So a higher seat load with a lighter upper mass of the spring combines to give the valvetrain more control.
max lift on stock chevy 350 rocker arms?
What is the max someone has run on a stock set of 350 rocker arms? I'm not asking about a current project, I would just like to know the absolute tested limits- or even theoretical limits.
max lift on stock chevy 350 rocker arms?
What is the max someone has run on a stock set of 350 rocker arms? I'm not asking about a current project, I would just like to know the absolute tested limits- or even theoretical limits.