Bent valve help - TCCoA Forums

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post #1 of 11 (permalink) Old 04-27-2017, 10:09 AM Thread Starter
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Bent valve help

So was going through my heads and the right side head is almost perfect but... the valve seal seat is broken off anyway to fix it? I'm guessing no but wanted to make sure. Any Advice would be great
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post #2 of 11 (permalink) Old 04-27-2017, 10:33 AM
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Can it be fixed? Yes. Is it worth fixing? No. It would be significantly cheaper to just replace the heads

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post #3 of 11 (permalink) Old 04-27-2017, 12:22 PM Thread Starter
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Thanks for the info. I guess pi head swap is in order.
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post #4 of 11 (permalink) Old 04-27-2017, 06:21 PM
No, Mr. Lemmywinks, No!!!

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I'm curious; did a bent valve break off the seat?

A pi swap will rock; there's a compression boost.

PI heads can be had pretty cheaply, too.
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post #5 of 11 (permalink) Old 04-28-2017, 08:32 AM Thread Starter
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That is what I'm thinking happened. I liked my heads tho. Fox lake stage 3 npi heads I bought from a member on here. I got some pi heads sitting in my shed so I guess it's time to use them
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post #6 of 11 (permalink) Old 04-28-2017, 12:19 PM
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Quote:
Originally Posted by jlongsbird96 View Post
That is what I'm thinking happened. I liked my heads tho. Fox lake stage 3 npi heads I bought from a member on here. I got some pi heads sitting in my shed so I guess it's time to use them
If they are stock NPI heads, I would go with the PI ones. I don't know what "Stage 3" means to Fox Lake so you might want to check with them to see if they think it's worth the repair (in terms of perf vs PI heads). You can then decide by getting a repair cost from a local machinist if the ROI is there.

FWIW, don't just trash/recycle the heads even if you go with the PI swap; someone on CL will buy your old heads in AS-IS condition b/c they can repair it themselves for a cheaper cost than you would have to pay for machinist time (if it turns out that the repair cost isn't worth it).

I've sold stock 302 E7 iron heads, used stock rocker arms + springs with >100K mi on them, even an incomplete set of stock 302 GT40 valves that needed to be reground for beer money (tens of bucks). You will likely get more for the modified Fox Lake heads even if damaged.



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post #7 of 11 (permalink) Old 04-28-2017, 05:48 PM
No, Mr. Lemmywinks, No!!!

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Originally Posted by jlongsbird96 View Post
...Fox lake stage 3 npi heads I bought from a member on here...
Those were expensive, back in the day.

That makes more sense; stock heads won't usually break when you bend a valve, there's not that much lift.

I'd at least see what they are compared to PI heads; you may not be happy with that swap.

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
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post #8 of 11 (permalink) Old 04-29-2017, 02:42 PM
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Looks to me like it's just a broken guide. Can't the machine shop just install a new one for relatively low cost?
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post #9 of 11 (permalink) Old 04-29-2017, 03:21 PM
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I didn't realize they were ported heads, they may be more worth fixing in that case. The guide can be replaced yes but depending on the severity, which I imagine is high with a guide failure, the seat probably needs machining or even replacement too.

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post #10 of 11 (permalink) Old 04-29-2017, 08:03 PM
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Wonder what happened to these heads for them to fail like that.
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post #11 of 11 (permalink) Old 05-01-2017, 02:55 PM
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Ask performance machine shops...sometimes they have heads they have lying around that they sell pretty cheap. Most heads are repairable for $$$$$$$.
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