I have a 1985 Monte Carlo that had a v6 throttle body in it and I got a 454 v8 carb engine with a 400 tranny. can someone help me with where I need to start with the conversion and how hard this is?

5

Asked by May 23, 2015 at 10:36 AM about the 1985 Chevrolet Monte Carlo

Question type: Car Customization

I have a 1985 Monte Carlo it had a v6 throttle body engine in it.  I just purchased a 454 carb
erased 3 fine and I am not sure what I got myself into with this. THE 454  has a tranny on it
it's a complete motor so I am trying to figure out what I'll need to convert this.  Any help
would be awesome

8 Answers

2,395

First off would be motor mounts, transmission cross members, and drive shaft length.

1 out of 1 people think this is helpful.
5

Do you happen to have any idea how much this conversion will run me

Dont forget the upgraded suspension and brake system. All told? Its going to cost alot unless you do it ylurself, and then you would still be better off getting a Monte built with a factory 305 and go from there.

1,495

Start with the correct big block upper & lower motor mounts, for an 85' Monte Carlo from Chevrolet parts dept. A 400 trans cross member & shorten or buy a custom length drive shaft. The 400 trans tail shaft is much longer. SS Chevelle parts might interchange. Install the motor with the front off it makes it much easier. A big block project Monte! Sounds cool.

7,085

Sell the big block and put an LS1 in it, you'll be a lot happier with it in the long run, you won't have to modify the brakes and suspension to accommodate the heavy set up the only mechanical mods would be what JRK mentioned and will up the value of the car when you sell it with an injected engine.

1 out of 1 people think this is helpful.
1,495

Since you already purchased the 454, keep the car 1985 period correct. Big block Monte Carlo's were rare & so cool. And during this mod add tube headers & a shift kit valve body & 3000 rpm stall speed convertor for that turbo 400 trans. I hope you have a posi rear end (4.11 - 4.56 ratio) too for this monster?

1,495

I did a mod similar to this swapping out a 396/375 hp for a 427 /430 hp L-88 in my 1969 SS Camaro. The stock 396 turned 13.00 sec's flat in the quarter. Not bad in 69'- 70' & a A/SA class, Mopar Hemi killer! The L-88 turned high 10's low 11''s all with the turbo 400 trans. But I'm "old school" but still cool.

1,495

Again remove V6 engine & trans. Remove fenders & wheel well assembles. Remove cross member & radiator. Position new 454 motor lower mounts on frame & weld-in. The motor posistion is determined where the trans bolts up to the new trans cross member. Buy one from Chevrolet parts dept or a salvage yard, A Chevelle auto trans cross member will work too. It might have to be repositioned too? Due to longer length. You can "hang" the motor & mark on the frame where the mounts should be welded in. This mod is medium to major, get a motor head friend to help.

Your Answer

Add photo

Related Questions

  • What makes are interchangeable for a76 Monte Carlo 1 answer

    Changing over to swivel bucket seats and having a hard time finding the front seat belts from a Monte Carlo, are there other chevy's from that year that I could find the seat belts

    1976 Chevrolet Monte Carlo

    -

    Car Customization

  • What frames will fit under a 1980 Monte Carlo? 3 answers

    I have a 1980 Monte Carlo and want to know which other vehicle frames will fit under it.

    1980 Chevrolet Monte Carlo

    -

    Car Customization

  • Is it worth it to put a supercharger in a non supercharged Monte SS 1 answer

    I have a 04 Monte Carlo SS non-supercharged. Bought it used, and want to put in a supercharger. I have found one, but before i buy it, is it worth it, and how hard will it be.

    2004 Chevrolet Monte Carlo SS

    -

    Car Customization

  • changing the factory radio to an aftermaket radio 2 answers

    I need to change my factory radio (the cd player stoped working) to an aftermarket radio. Having a hard time finding the wiring kits that would allow me to keep all the warning indicators and chimes. ...

    2004 Chevrolet Monte Carlo SS Supercharged

    -

    Car Customization

  • monte carlo ! 16 answers

    what year is the most favoriate year monte carlo

    Chevrolet Monte Carlo

    -

    General

Monte Carlo

Looking for a Used Monte Carlo in your area?

CarGurus has 1,662 nationwide Monte Carlo listings starting at $2,000.

ZIP:

Search Chevrolet Monte Carlo Questions

Chevrolet Monte Carlo Experts

#1 Tom Demyan
Tom Demyan
Reputation 460
#2 FordNut
FordNut
Reputation 420
#3 Js08016
Js08016
Reputation 410
View All

Related Models For Sale

Used Chevrolet Impala
793 Great Deals out of 34,384 listings starting at $799
Used Chevrolet Camaro
282 Great Deals out of 38,299 listings starting at $1,250
Used Dodge Charger
357 Great Deals out of 29,619 listings starting at $2,475
Used Ford Mustang
362 Great Deals out of 44,486 listings starting at $1,000
Used Pontiac Grand Prix
28 Great Deals out of 3,715 listings starting at $1,100
Used Chevrolet Caprice
175 listings starting at $13,998
Used Chevrolet Corvette
180 Great Deals out of 20,807 listings starting at $3,995
Used Buick Regal
123 Great Deals out of 10,947 listings starting at $1,850
Used Nissan Maxima
347 Great Deals out of 25,223 listings starting at $1,400

Used Cars For Sale

2007 Chevrolet Monte Carlo For Sale
6 Great Deals out of 161 listings starting at $2,595
2006 Chevrolet Monte Carlo For Sale
8 Great Deals out of 251 listings starting at $2,588
2005 Chevrolet Monte Carlo For Sale
167 listings starting at $3,995
2004 Chevrolet Monte Carlo For Sale
273 listings starting at $2,000