Zilla's rebuild (exhaust mod revealed, gauges going in.....) - Page 10 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 03-18-2007, 01:03 AM   #91
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A little more material gone now. Valve lapping for the rear head is complete. Nothing left to do but paint this head, assemble it, and set it aside. Then it'* on to the front cylinder head.

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Old 03-18-2007, 01:06 AM   #92
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man that would have messed with me bab messing around around the valve seat with a dremel. your a brake man
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Old 03-18-2007, 01:33 AM   #93
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Quote:
Originally Posted by ieatfeets
man that would have messed with me bab messing around around the valve seat with a dremel. your a brake man
Have a good St. Patty'* day there?
Looks great, Bill. Keep it up on the second head.
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Old 03-18-2007, 11:34 AM   #94
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I'm not looking forward to working around those valve seats again. I even considered cutting a plastic tube to 'buffer the hit if there is one. On the front head, I'll probably tape the collets up on the die-grinder and dremel.

I chose this pic on purpose:

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On the intake valve seat in the upper left of the pic, you can see how close I came to goofing the actual seat. Just below where I lapped the seats.
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Old 03-18-2007, 06:14 PM   #95
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yes it was a great st pattys day. the bad thing is i came back a few times to fix it before i read all the way through.
man you nearly goofed up there.
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Old 03-18-2007, 07:24 PM   #96
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Sooo when are we going to see completed pictures? C'mon put the new valve seals and springs on.. we want finished pics.
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Old 03-18-2007, 07:40 PM   #97
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I have no valve seals. Finishing up this one. It'* painted. Need to clean out the threads on the bolt holes, lightly oil it, snap a couple pics, an set it aside.

Front head gets pre-cleaned tonight.
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Old 03-18-2007, 09:58 PM   #98
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Valve seals ordered today. Until they arrive, this will have to do for the rear. Sealing in plastic after oiling for the wait, moving on to the front cylinder head next.

This is the last of the rear for awhile:

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Old 03-22-2007, 09:11 AM   #99
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Got my gaskets and bolts, as well as my timing gears and chain yesterday. Water pump is still enroute, but I still have alot of work to do before assembly anyway.

Final measurements were made yesterday on my rear cylinder head before starting on the front. Without taking into account the gains from smoothing, and ONLY the port size changes, I've gained 8% on the intake side, and 18% on the exhaust side. This is why I call it a mild or 'stage 1' cylinder head porting. Should be in the 10/20 range due to smoothing, as well as the work I did in my valve bowls.
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Old 03-22-2007, 01:54 PM   #100
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That should be noticeable.
Do you think it will affect low speed torque at all
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