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Old 01-05-2018, 02:03 PM   #8
MilzyZ34
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Join Date: Jan 2005
Location: Dayton, OH
Posts: 215
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Over the years, there have been minor differences between 3400's in different vehicles. There are 3 different upper intakes, 4 different lower intakes, and about 5 different castings for the heads. Some versions if the heads are slightly better. The 2002 Grand Am heads for instance are just a little better than the mini-van style ones These differences are very minimal, and most likely would result in no horsepower difference. So the engines themselves are pretty much identical with minor changes through the years where they changed EGR styles, throttle body styles, year stampings, or rocker bolt sizes, but what about the vehicle specific stuff like the downpipe/cat-back exhaust system, and the PCM tune. Well the cars that claim more power are typically cars that are more conservative like Buicks and mini-vans, which tend to have even more restrictive exhaust systems. The tunes in these cars also tends to be more conservative for the shifting. What about the intake/air cleaner setup? Well even if you put the best cold air intake you can get on a 3400, like a 3-3.5" fenderwell with a good filter, you're only going to gain 5hp. The stock system isn't that much of a restriction, atleast for a stock or close to stock engine. So if the best intake setup compared to stock is only 5hp difference, then one stock setup compared to another stock setup isn't very much, especially given the fact that many use the same exact filter. It's hard to put a number on horsepower differences this small because even if you dyno it before and after, you'll typically see a variance in power +/- up to 5hp from run to run, so if it's less difference than 5hp, you have to do multiple tests of each and take an average to even estimate the difference. So at the end of the day, there really is no difference in power. What you're seeing when some vehicles are rated at more or less power is solely GM trying to sell cars.

If all you want is 15hp, you can get that from my PCM tune, which is currently on sale for $79.99 right now ... http://www.milzymotorsports.com/mms-...ol-module-pcm/

The best bang for your buck is the standard performance package because it addresses all the initial bottlenecks of the stock setup, which is also on sale starting at $450, which is a savings of $115 (or more depending on options) from buying all the parts individually at normal retail price. ... http://www.milzymotorsports.com/mms-...-3400-engines/
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www.milzymotorsports.com
1999 Z34 - 3800 Turbo - Under Construction
1999 Grand Am GT Turbo race car - 12.1ET on stock engine with 10psi!
1977 Corvette - LS1/LS6 T56 - Under Construction
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