Valve Job options
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Valve Job options What would you guys prefer on a set of stock hand ported heads? I have a spare set around and can get the work done at a reasonable cost. The only thing I am having issues with is choosing the type of valve job I want done. Will the typical 3 angle suffice, or should I go more extreme? I will also be upgrading to ferra valves.
Please do not come in here and smart off about hand porting and so on. That is not your concern and I do not care to hear your opinions on it. I am well aware of what a competent porter can do vs. a cnc. This is not up for discussion.
What are you stock eliminator guys doing? If you do not want to share this information publicly, please PM me.
Thanks.
Please do not come in here and smart off about hand porting and so on. That is not your concern and I do not care to hear your opinions on it. I am well aware of what a competent porter can do vs. a cnc. This is not up for discussion.
What are you stock eliminator guys doing? If you do not want to share this information publicly, please PM me.
Thanks.
At your power level there is no real measurable difference. Maybe on a 1000+HP car, but not on a heads/cam LT1. Go with whatever you can get cheapest (obviously the 3-angle).
There is definitely power to be had or lost in a valvejob at all power levels, and going with the cheapest will probably be a loss in performance over the stock one.
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I had originally planned on a 3 angle valve job and possibly back cutting the valves. Just the valve job will run me $150 at my local machine shop. I have complete confidence in my porters work, but I want to ensure I am getting the most benefit out of the process.
Out of the mouth of 7-time engine builder of the year at Atco Raceway Gil Davis, "It's not going to make that much of a measurable difference under 1000HP."
Just sayin'.
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Teching In
Joined: Nov 2002
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From: Baton Rouge, La
If you don't think a valae job is important, read this thread-
https://ls1tech.com/forums/drag-raci...al-winner.html
BrandonB
https://ls1tech.com/forums/drag-raci...al-winner.html
BrandonB
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Are you planning on installing larger valves or are you using stock valves? If you are using stock valves then about all you can do is a simple 3 angle VJ. The stock seats are radiused on the intake. About all you can get is about .080 wide 60 degree angle in there, if you get much more than that you are sinking the intake valve kinda deep which isnt good for flow numbers. The shape of your seat is the main thing that will determine how effiecient you heads will be in the lowlift range. A simple 3 angle VJ with stock valves wont yield much gains but wont hurt you either from my experiences. If you go with larger valves then your window of opportunity grows a bit, just as your window of error. Theres more to seat angles than most people would have you think.
