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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 01-03-2008, 12:24 AM   #391
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16 lbs is not much boost.

They should be good to 20 psi
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Old 01-03-2008, 09:30 AM   #392
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My 260K head gaskets held 16.5psi FWIW. Hope everything is alright Jeff.
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Old 01-03-2008, 12:44 PM   #393
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Ya, but 16psi too lean will blow it, obviously. The rear manifold, even the stock one, outflows the front manifold, alot of people skew the rear injectors so the rear cyls don;t run lean. I was going to do it and forgot about it. Esp with my rear header, it'* 1-3/4" tubes into a 2" pipe.

So, after all this, I will have an O2 bung in both the rear header and in the uppipe just after the front manifold so I can monitor a/f from both banks and really fine tune it. That will keep this from happening again.
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Old 01-03-2008, 03:38 PM   #394
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Quote:
Originally Posted by pontiacjeff
Ya, but 16psi too lean will blow it, obviously.
Yeah, I know all about it, but mine didn't pop the gasket . I was just trying to support the fact that factory head gaskets will hold 16 psi. Hope the bottom end is alright.
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Old 01-03-2008, 10:12 PM   #395
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I thought I'd go for 400 posts, so I'll put these pictures here...

I've never in my life seen amything like this!





It didn;t just blow, IT PUKED IT OUT!!!!

Fire shot out under the car!

I thought I blew the downpipe til I saw this. I drove the car about 5 miles back to the shop.
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Old 01-03-2008, 10:13 PM   #396
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Since I had to wash my hands to take the pics, I went ahead and posted, I'm going to pull the head rihgt now. Pray for me and the #4 piston!
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Old 01-03-2008, 10:40 PM   #397
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SHE-E-E-E-E-E-E-E-E-E-W!!!!!!!!!!!!!!







Didn;t even leave a mark on the piston or cyl wall!

I think I really dodged a bullet tihs time!
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Old 01-04-2008, 08:47 AM   #398
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Quote:
Originally Posted by pontiacjeff
I think I really dodged a bullet tihs time!
Good to hear!
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Old 01-04-2008, 01:56 PM   #399
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It appears that wasn't a factory OEM head gasket that blew out. I see you have converted to head studs. That will only improve retention.
Something must not have been right with the gasket install or the gasket itself.
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Old 01-04-2008, 02:32 PM   #400
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Quote:
Originally Posted by 2000SilverBullet
It appears that wasn't a factory OEM head gasket that blew out. I see you have converted to head studs. That will only improve retention.
Something must not have been right with the gasket install or the gasket itself.
On the ocntrary, it IS a factory gasket. I can;t imagine there was a problem with the install. It was not the first time I got on it either. I've been hard on it since I did the gaskets (the second time, first being when I built the engine).

Last week I was running and trying to itme 0-60 second gear starts, ran it at least 10 times to rev limit in 2nd gear with no problems. I really think it was the extremely cold dense air and it just leaned out. The POP! was scary as hell! Fire blew out under the car! I thouhgt i blew the engine!
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