Heading into the home stretch!! - ZR-1 Net Registry Forums

Paul Workman · 06-20-2010

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.

LGAFF · 06-20-2010

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.

Paul Workman · 06-20-2010

Quote:

Originally Posted by LGAFF

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.

bobbyhi · 06-20-2010

A lot of hard work and a good job Paul=D>

rhipsher · 06-20-2010

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.

Aurora40 · 06-20-2010

Nice! I can't wait to hear how she runs!

06-20-2010	#1
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,493	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. __________________ 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 Last edited by Paul Workman; 06-20-2010 at 12:22 AM.

06-20-2010	#2
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	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. __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

06-20-2010	#4
bobbyhi Join Date: Jul 2005 Location: Mendota Heights, MN. 55120 Posts: 984	Re: Heading into the home stretch!! A lot of hard work and a good job Paul=D> __________________ Bob Anderson 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 Minnesota State Director Founding Member #19

06-20-2010	#5
rhipsher Join Date: Aug 2008 Location: Houston 90 Red ZR-1 Posts: 2,320	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.

06-20-2010	#6
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,713	Re: Heading into the home stretch!! Nice! I can't wait to hear how she runs! __________________ Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img]