Garrett, The grooves are well crafted and in perfect place, leave them alone. Make sure the heads have been machined ' perfect flat ' with no rock on a surface plate. The inner well of the combustion chamber looks very rough in finish, leave this alone too. Lap the valves into the seats and make sure the steam seals are a proper fit. Make sure the push rods do not stick out too much due the shave and upset the tappet settings as they are all worked out for a particular height. Torque the head to the specified torque not more. Give the Radiator a good wash and replace any damaged hoses and check on the thermostat and new coolant too. The rest you know better. You will learn as you move ahead ! Just use STD spark plugs. Don't waste your time with fancy extra long projected nose, three fanged noble metal-ed Spark plugs ! Waste of time as they were all developed for STD Stagnant Combustion Chambers designs lacking the turbulence. You will have to remind your self all the time - You have ended up developing your own Turbulent Combustion Chamber that needs no outside assistance except for a proper static ignition timing point /setting followed by a suitable advance curve having the vacuum assisted mechanism in place. No fancy Oils either. Just the regular stuff with regular fuel running through the veins. If you can't shift the static advance or the idling, just leave it alone and get it started - You will still see benefits. The emission certificate will spell the rest ! We are all waiting to hear the engine fire up ! sing !!!
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Re:Chevy 350 grooving
Date: 2006/05/16 21:31
By: herning
Status:
Karma: 0
Thanks for the comments! And the idea of the grooves in the first place...
I've spent quite a bit of time on these heads as I had them decked 0.060" so they are ture and flat, as well as done a full valve job and put in all new valve seals. I've got the procedure for setting the push rods and rocker arms... so that shouldnt be a problem. I've already test fit them on a spare block and shaved the intake to match so there should be no fitment suprises :)
I was thinking of using the Bosch platnum + spark plugs as they have the 2 electrodes that stick up on either side of the center... this way I could index then so that there is a clear path from the plug to each of the grooves. I guess I could always index a standard spark plug as well to achive the same effect.
As this engine is electronic controlled I'll have to leave the timing and idle as is for now, however I am looking into using a wideband o2 sensor and design a control and interface circuit so I can control the AF ratio I want as I think I could run it a bit leaner than it is now. But I need to really look at what the OBD1 info coming off the ECU says after this modification.
At any rate, Saturday is the day I will bedoing the swap... I've been taking lots of pictures and will put up a webpage to show. I'll post it here for all to see. :D
Garrett
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Re:Chevy 350 grooving
Date: 2006/05/24 22:44
By: herning
Status:
Karma: 0
Hey everyone,
I was able to get my modified heads on last weekend and have begun driving them around. I got a web page started, but stay tuned as there will be a second dyno run, MPG figures and such...
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Re:Chevy 350 groving
Date: 2006/08/09 15:04
By: trevor
Status:
Karma: 1
This past weekend we made a 210 mile run down the I-5 freeway to Salem, Oregon.
Vehicle returned 18 mpg.
TH
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Re:Chevy 350 groving
Date: 2007/09/12 15:49
By: suburbanman
Status:
Karma: 0
Hi will be grouving my 1994 suburban heads my question is how wide did you made your grouve in the squish ( no mention ) in your description ..
serge
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Re:Chevy 350 groving
Date: 2007/09/22 04:36
By: singh
Status:
Karma: 4
Hi Suburbanmam, The answers to your question are displayed in detail @ Groove Photos from 2005 & 2006 ! The length, depth & width are all proportionate to the 100's of photos displayed on the net. There is no hard and fast rule that dictates turbulence by size ! Grooves or channels are the simplest of designs that promote directional turbulence close to TDC. The well tried single narrow long groove across the deepest part of the squish pads pointing towards the spark plug have been the most effective & succesful ones to reach your ' day to day ' goals !
If you need to find the optimum size ? You will have to wait for a while ??? Till some one else comes up with some thing simpler than the groove or the channels ? The YouTube Video http://www.youtube.com/watch?v=Ss7slCT0Vpw can't get any simpler than a " Hack Saw Blade " to " Hack Your Head ! !
sing !!!
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Re:Chevy 350 groving
Date: 2007/10/28 14:58
By: suburbanman
Status:
Karma: 0
well verry disappointed the 2 heads from the junck yard were crack......my question is ! if i can put my hads on world product r/s heads no:42750-1 ....58cc 1987 later intake face this will work for grooving no need for milling down just put grouves on it and instal right !
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