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Old 09-06-2009, 10:39 AM
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can i put headers on a 94 chevy caprice 4.3L

I have a 94 chevy caprice wit 30,000 miles. I was thinkin bout swapin the motor out wit 350 lt1, imma jus build on motor since it has very low miles. Can i put headers on it even tho it's a 4.3L v8 and does the Hypertech Power Programmer reallly works? Wats does it really do? Thanks

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Old 09-07-2009, 07:26 PM
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sure

you can put headers on any thing ...if you are willing!now how it affects anything i dont know...but if you can think it ...it can be fabricated
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Old 09-07-2009, 10:54 PM
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LT1 and L99 are externally identical, so headers for an Impala SS will bolt up the same. Hypertech programmers work, but only mildly. From the factory, GM programs fuel curves to be slightly rich for two reasons; emissions and consumer error. Richer fuel curves help get the catalysts up to temp faster, they lower NOx emissions, and they add a buffer for consumers who put their foot to the floor while towing a boat and dragging around a trunk full of luggage. Its worth it to reduce their warranty repairs by 2% and help meet emissions requirements by a slam dunk instead of just by a narrow margin.

The hypertech power programmer does two basic things; reduces fuel delivery for a more optimum mix, and (at your request) advances spark timing to take advantage of a more optimal combustion events.

On the Caprice you can make changes to the fuel curve and still use 87 octane. If you make changes to the spark timing you'll have to go with 91 octane or better. Overall, expect 5 hp with the fuel changes and about 10 hp if you add the spark changes. Niether will be felt in your normal daily driving.
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Old 09-07-2009, 11:57 PM
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If you want a really good LT1/99 tune, talk to Bryan Herter of PCMforLess.

http://www.pcmforless.com/

Much better than the Hypertec PCM tune.

peace
Hog
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Old 09-08-2009, 12:10 AM
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Quote:
Originally Posted by Hogg
If you want a really good LT1/99 tune, talk to Bryan Herter of PCMforLess.

http://www.pcmforless.com/

Much better than the Hypertec PCM tune.

peace
Hog
Amen... I have used Bryan about a dozen times for my LT1 tunes and he is great. Not only does he do complete custom tunes, he does it with a one-on-one personal service that is cheaper than buying a programmer.
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