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Discussion Starter · #1 ·
I have a set of GT40 heads i'm getting close to installing on my '88 T-Bird.The current set-up has the smog pipe between the heads at the rear.Well,the GT40 heads don't have that provision.How do I by-pass the smog pipe without causing any problems?Thanks.
 

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Could very well be wrong but I thought the air passages in the heads were used during warm up to help the converters light up. I had the opposite problem with a car and couldn't get the air tube to the converters hooked up so I disconnected the hose at the diverter valve and just let it vent to atmosphere. It had an offroad pipe so I didn't worry about converter damage, and I never could hear anything from the valve. I'm sure someone from a state with emission testing would know if you left the head pipe off if it would damage your converters.
 

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jb weld the pipes to the back of the heads... or drill & tap holes to bolt the tube on, just so it stays in place. Somebody gave me this advise about the same subject:
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"You should be able to pass smog test just fine. You will still need the air pump going to the convertors. But the part that goes to the heads will not be needed. The divertor valve in the smog hoses diverts cool air from the air pump to the cyclinders to trick the O2 sensor to richen the mixture during cold start. Once warm the divertor vavle send the air from the air pump to the convertors to make them burn cleaner and more efficent. The heads not being drilled for smog should not effect emissions since the test is done with the vehicle warm. But you will still need the air pump to pass."
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Discussion Starter · #7 ·
I have them on E-Bay for $300.00 plus shipping.They are in EXCELLENT condition.In the pics on E-Bay,there's a tiny bit of rust on one of the valve pockets,that's from sitting an a wet towel on my work bench.They are great.
 
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