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Chevrolet Repair/California emissions

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Question
Hello,
 My name is David and I have a 2002 Chevy Trailblazer. It's a 4.2L I-6 4x4 and it's getting a little high up there in milage.  My question is:  Can I legally change the I6 for something a little more stable and a little more torque.I intend to keep the car but I wish to swap the engine out for something that can better handle the weight of the car.  The truck was offered with a 5.3L V8 and from what I've heared, the V8's gas milage seems to be the same as the I6 (possibly a bit better).  I wanted to swap in that V8 and keep the car going but there is so much negative talk about that subject here.  Better yet, can another engine from another G.M. platform (LS1?)be used in this Trailblazer and be passed through a California smog referee?  Thank you in advance for any and all advice that you can provide.

Answer
HI DAVID,WELL I HAVE BEEN ASKED THIS TYPE OF QUESTION A MILLION TIMES...YES THIS CAN HAPPEN AND YES IT WILL WORK,THE PERFORMANCE WILL BE BETTER AND THE GAS MI MAYBE A LITTLE BIT BETTER..
BUT NOW COMES THE BUT THAT YOU HAVE BEEN WAITING FOR !!!!WHY DO YOU WANT TO DO THIS ??? AND DO YOU REALLY WANT TO DO THIS ??? THIS IS A TON OF WORK,, NEW MODULES,NEW ENGINE,NEW WIRING HARNESSES,ALL NEW SENSORS,NEW FUEL PUMP...ANYTHING CAN BE DONE, BUT THE QUESTION IS DO YOU WANT TO SPEND ALOT OF YOUR MONEY ON MAKING THIS HAPPEN ??? ONLY YOU CAN ANSWER THIS..YOU CAN LEGALLY DO THIS IF ALL OF THE EMISSIONS ARE MET TO SPECS,EVAP,PURGE VALVE, SHUT VALVE,FUEL TANK PRESSURE SENSOR & ETC..YOU CAN SEE WHERE I AM GOING WITH THIS. IF IT WERE ME, I WOULD DO 1 OF 2 THINGS,REPLACE THIS ENGINE WITH THE SAME KIND OF ENGINE OR PUT IT ON CRAIGS LIST AND SELL IT FOR A V8 IF THIS IS WANT YOU WANT..I AM SORRY FOR THE BLUNT NEWS BUT THIS IS HOW I FEEL..GOOD LUCK TO YOU AND IF YOU NEED MORE HELP LET ME KNOW,,,TOM..

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TOM SHEETS

Expertise

PLEASE READ ALL OF THIS BEFORE ASKING ANY QUESTIONS. IF THIS CHEVY SECTION IS MAXED OUT.YOU CAN REACH ME IN THE OLDS/BUICK SECTION. Will answer questions from 6:00am to 10:00pm all days [EST][[[ NO DIESEL OR PAINT QUESTIONS]]] will answer all 1965 to present QUESTIONS ON ALL GM'S on mechanics of these cars. Keep in mind i am not there in person i am going on what you are telling me !! PLEASE IF ASKING A QUESTION GIVE ME AS MUCH INFO AS POSSIBLE. THE MORE THE BETTER. SUCH AS YEAR,MAKE,MODEL,ENGINE SIZE. THIS WILL HELP ME HELP YOU. I will not be able to answer all questions because of some situations that i would really need to be there and see things for myself,such as electrical issues. In many cases i would need wiring diagrams. I can also give you an estimate on what the cost would be at our repair shop as an idea to help you. Keep in mind that my answer is ONLY MY ADVICE,ck with your mechanic as well.. >> THANK YOU, TOM..

Experience

I have been a ASE certified master mechanic for over 30 years and certified IN ALL 8 CATEGORIES,[engine repair,engine performance,auto trans,manual trans,clutches,steering and suspension,brakes,electrical systems,heating and air/cond. I am also a state CERTIFIED inspector for over 30 years. I do computer work [pcm]fault codes,pcm flashing,state inspection monitor readiness,repairs on exhaust,fuel service,[injection and carburetor,] charging system problems, running issues,alignments,frame problems,tire balance,struts and of course standard and anti-lock brakes.

Organizations
nys state auto repair industry and ase group.

Publications
N/A

Education/Credentials
high school,4 years of tech school,and many many hours of auto training with many gm classes and aftermarket training classes..

Awards and Honors
ASE MASTER TECH CERTIFIED IN ALL 8 CATEGORIES.NYS INSP LICENSE AND A/C CERTIFIED

Past/Present Clients
MANY CUSTOMERS IN OUR BUSY SHOP.

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