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Old 06-20-2010   #1
Paul Workman
 
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Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
Default Heading into the home stretch!!

It seems like "forever" since Lee and I pulled my hurt LT5 from the engine bay. The car will have been on jacks for 10 months, come June 30th.

Started out with what turned out to be a "melted" valve; according to the skilled eye of the machinist grinding the valves and seats.



Well, as long as the heads were off anyway, might as well port them, right? And, with a shining example (Pete's heads) to go by, might as well push the limit, huh? But, as Mark Haibeck once told me, "85% of the risk is in the last 15% of the porting!" How very true, it turns out. Welding a booboo on these heads takes a very skilled welder with the right equipment and rods. I feel I learned a great deal about porting these heads, but if I had it to do over, I'd think hard about just having them CNC'd by Pete's guy and be done with it.

However, it hasn't been all frustration. In the end I was able to incorporate nuance nuggets from Marc Haibeck's approach as well as Pete's on both the porting, the bowels, and relieving.

Anywayz...The last bit was to seal up a pin-hole in a weld in the lifter side of the runner. (Held 21" of Hg for over 15 minutes and never lost a bit!) Now both heads are sporting a very nice multi-angled valve job, been relieved, and milled. Time to put it back together!!

Some pix "along the way"...









It shouldn't be long now!

P.
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90 #1202
"FBI" top end ported & relieved
Cam timing by "Pete the Greek"
Sans secondaries
Chip & dyno tuning by Haibeck Automotive
SW headers, X-pipe, MF muffs

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Last edited by Paul Workman; 06-20-2010 at 12:22 AM.
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Old 06-20-2010   #2
LGAFF
 
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
Default Re: Heading into the home stretch!!

OK, WTH is up with waiting until the hottest part of the year again, my wife must have a deal with you to try and collect on my life ins.
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90 #966-150K miles-sold
92 #234-sold
1987 Callaway TT #17
1991 ZR-1 #1359
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Old 06-20-2010   #3
Aurora40
 
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Join Date: May 2005
Location: Leesburg, VA
Posts: 2,713
Default Re: Heading into the home stretch!!

Nice! I can't wait to hear how she runs!
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Old 06-20-2010   #4
Paul Workman
 
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Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
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Default Re: Heading into the home stretch!!

Quote:
Originally Posted by LGAFF View Post
OK, WTH is up with waiting until the hottest part of the year again, my wife must have a deal with you to try and collect on my life ins.
Twazunt mah choice neither, ol' buddy!! (But, we had to optimize our chances on collecting from the insurance!)

Haven't checked the long range forecast, but it will be July before she roars, and it doesn't look like snow is in the forecast either!!

p.
__________________
Good carz, good food, good friendz = the best of timez!

90 #1202
"FBI" top end ported & relieved
Cam timing by "Pete the Greek"
Sans secondaries
Chip & dyno tuning by Haibeck Automotive
SW headers, X-pipe, MF muffs

Former Secretary, ZR-1 Net Registry
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Old 06-20-2010   #5
bobbyhi
 
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Join Date: Jul 2005
Location: Mendota Heights, MN. 55120
Posts: 984
Default Re: Heading into the home stretch!!

A lot of hard work and a good job Paul=D>
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1990 #2405 White/Gray
Haibeck chip,4:09 gears,Power Effects Exhaust,5 spoke chrome,C5 brakes,49th Street rockers,K&N,Hurst,Headers,Upper & lower ported

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Old 06-20-2010   #6
rhipsher
 
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Join Date: Aug 2008
Location: Houston 90 Red ZR-1
Posts: 2,320
Default Re: Heading into the home stretch!!

I hope it fires up and runs good without a hitch. I know its been a while on jack stands. I wasn't afraid to do my own top end porting but if I want to have the heads done then I'm just going to take it to LPE and pay the 29k and have them turn it into a 415 storker. zero miles on the od. brand new 564 rwhp with a warrantie for 2 years or 24k miles. for me that warrantie makes all the difference in the world and puts my mind at ease. I plan to take it to LPE within the next three years.
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