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Author Topic: Stock heads  (Read 8206 times)

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Offline Shimy87

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Stock heads
« on: October 26 2016, 10:57:21 AM »
How fast/quick can you go on stock heads?
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87 GN, K&N cold air, gutted cat, TT 5.7 chip, AFPR, 340 Walbro w/ hotwire, 60 LBS injectors, 981 valve springs, 206/206 Cam, RJC Powerplate, LS1 MAF & translator, Vacuum brakes, Hellwig rear sway bar, Energy suspension poly bushings, Razors Alky, Pypes exhaust, 5931 turbo, CK9.5 converter

Offline TexasT

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Re: Stock heads
« Reply #1 on: October 26 2016, 11:52:59 AM »
http://turbobuick.com/threads/project-car-build-for-the-board-rusty-silver-bullet-seeking-10s-asap.400319/
I didn't read far enough in to see how fast it went on stock heads but it might have gone 10s
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Offline motorhead

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Re: Stock heads
« Reply #2 on: October 26 2016, 12:23:07 PM »
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Offline earlbrown

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Re: Stock heads
« Reply #3 on: October 26 2016, 04:13:06 PM »
Stock untouched heads, or stock castings?
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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline Shimy87

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Re: Stock heads
« Reply #4 on: October 26 2016, 05:21:51 PM »
Stock untouched....n ew springs
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87 GN, K&N cold air, gutted cat, TT 5.7 chip, AFPR, 340 Walbro w/ hotwire, 60 LBS injectors, 981 valve springs, 206/206 Cam, RJC Powerplate, LS1 MAF & translator, Vacuum brakes, Hellwig rear sway bar, Energy suspension poly bushings, Razors Alky, Pypes exhaust, 5931 turbo, CK9.5 converter

Offline earlbrown

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Re: Stock heads
« Reply #5 on: October 26 2016, 08:20:30 PM »
After this many years (with old springs) I'd do a valve job


....which leads straight to under cutting the ex valves, bowl porting, and polishing the chambers....
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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline motorhead

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Re: Stock heads
« Reply #6 on: October 26 2016, 10:17:41 PM »
Quote from: earlbrown on October 26 2016, 08:20:30 PM
After this many years (with old springs) I'd do a valve job


....which leads straight to under cutting the ex valves, bowl porting, and polishing the chambers....

That snowball effect sounds familiar.
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Offline Shimy87

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Re: Stock heads
« Reply #7 on: October 27 2016, 11:03:48 AM »
Going to snowball right into the 10"s!!   I wish :rock:
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87 GN, K&N cold air, gutted cat, TT 5.7 chip, AFPR, 340 Walbro w/ hotwire, 60 LBS injectors, 981 valve springs, 206/206 Cam, RJC Powerplate, LS1 MAF & translator, Vacuum brakes, Hellwig rear sway bar, Energy suspension poly bushings, Razors Alky, Pypes exhaust, 5931 turbo, CK9.5 converter

Offline achalmersman

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Stock heads
« Reply #8 on: October 30 2016, 08:04:37 PM »
I recently went 10.99 @122 with 93/alky on unopened longblock.  Untouched heads, cam, intake.  New springs though.  Took north of 35psi to get there. I believe with a tighter converter I could have gone faster. 

Sent from my VS990 using Tapatalk

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Offline Steve Wood

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Re: Stock heads
« Reply #9 on: October 30 2016, 10:01:36 PM »
Quote from: achalmersman on October 30 2016, 08:04:37 PM
I recently went 10.99 @122 with 93/alky on unopened longblock.  Untouched heads, cam, intake.  New springs though.  Took north of 35psi to get there. I believe with a tighter converter I could have gone faster. 

Sent from my VS990 using Tapatalk

Good run..had the wick twisted hard!
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Offline good2win22

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Re: Stock heads
« Reply #10 on: October 30 2016, 10:18:14 PM »
That is a good run!
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Offline Shimy87

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Re: Stock heads
« Reply #11 on: October 30 2016, 10:51:43 PM »
Impressive.... 35+ is pretty aggressive  :rock:  :cheers:
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87 GN, K&N cold air, gutted cat, TT 5.7 chip, AFPR, 340 Walbro w/ hotwire, 60 LBS injectors, 981 valve springs, 206/206 Cam, RJC Powerplate, LS1 MAF & translator, Vacuum brakes, Hellwig rear sway bar, Energy suspension poly bushings, Razors Alky, Pypes exhaust, 5931 turbo, CK9.5 converter

Offline earlbrown

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Re: Stock heads
« Reply #12 on: October 31 2016, 03:13:51 AM »
All that boost is because the valve job is tired and the bowls are corked up.

I'd love to see those heads come off so a simple bowl port, back cut the stock ex valves and slam it back together.


It's rare these days to find an unopended engine that's turning real times.
« Last Edit: October 31 2016, 03:41:10 PM by earlbrown »
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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline Forzfed

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Re: Stock heads
« Reply #13 on: October 31 2016, 10:16:30 AM »
Quote from: achalmersman on October 30 2016, 08:04:37 PM
I recently went 10.99 @122 with 93/alky on unopened longblock.  Untouched heads, cam, intake.  New springs though.  Took north of 35psi to get there. I believe with a tighter converter I could have gone faster. 

Impressive!  What turbo was that with and how much alky did you squirt?
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Offline phil_long

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Re: Stock heads
« Reply #14 on: October 31 2016, 02:18:54 PM »
Mine is almost unopened if you guys wanna use it for testing and return it to me when it's complete! Lol. Only a timing chain done.
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