bigblock conversion

Asked by Apr 17, 2010 at 03:05 PM about the 1966 Chevrolet Impala

Question type: Car Customization

I have a 66' Impala SS 327ci auto car. I want to install a 396ci and a 4sp in the car. the car has smallblock frame mounts in it now. bigblock frame mounts are not reproduced.. The smallblock frame mounts measure 2-1/2 inches wide. bigblock engine mounts that I"ve seen measure either 2-3/8 inch wide or 2-3/4 inch wide too tight or too loose! what do I do now?? I was told to buy a bigblock "donor" car. (good luck) I was Also toldI could use the smallblock engine mounts, they will bolt up to the 396 and the smallblock frame mounts but how could that work??? the 396 is so much bigger!! If it did bolt right up , would the engine be sitting in the right spot for everything else to work properly??  Any expert advice would be helpful    Thanks Chris.................

8 Answers

66bigblock396, I'm doing the same conversion on the same car. Let me know what you find out onthe mounts..tks. rtomumm@charter.net

you have to change the mounts on the chasis, not just the engine.

1 out of 1 people think this is helpful.
465

TRIP65 is right. You can pick up big block "towers" on ebay or possibly a local junk yard. You might have to move the taller(big block) towers forward one set of bolt holes if you have two sets(the '64 C10's do), as you need to get clearance from the firewall. The taller towers will raise the engine up & forward to give you clearance on the cross member also. You would be surprised though that there isn't as much difference in the block dimensions as one would think. Anyway, I'm going through the same scenario with my '64 C10 as I pulled my 283 out & am dropping in a 409! I do see the big block mounts on Ebay often for your car & situation.

I'll sell ya the pair I have for $100.00 original GM not reproductions

3 out of 3 people think this is helpful.

who told you these mounts aren't reproduced? they sell hundreds of aftermarket frame mounts ,check ecklers chevy parts.

2 out of 2 people think this is helpful.
1,245

i cant really see that being a part that is not reproduced, big block swaps are pretty common in any 60s american car...

1 out of 1 people think this is helpful.
465

I don't know about the car towers being reproduced, but I know the truck towers are not reproduced, and there are a few original NOS GM's floating around, but it's easy to find used originals.

i can give you plenty of places that sell reproductions ,yearone.com rickscamaros.com & summitracing.com just to name a few. there everywhere. just about every classic chevy parts dealer has them .

Your Answer

Add photo

Related Questions

  • v8 conversion 12 answers

    Anyone know if anyone has put a v8 in these or if it is even possible?

    2003 Chevrolet Impala Base

    -

    Car Customization

  • Modifying a 67-69 Impala? 2 answers

    I was just wondering what kinds of diesel engines would fit in a 1967-1969 Impala. I really like that body style but would rather have the torque and better mpg's of a diesel engine. I saw the convers...

    Chevrolet Impala

    -

    Car Customization

  • Im doin a 3.8 supercharged swap to my impala do i need the harness that runs threw the fire wall 3 answers

    Iv got the motor wire harness computer i dont have the harness that runs threw the fire wall

    2002 Chevrolet Impala LS

    -

    Car Customization

  • can you put a 350 in a 2005 impala ls 5 answers

    My 3.8 keeps overheating so I plan to do a engine swap. I like to go fast so I kind of want to put a 350 in it if its possible. My unkle is a mechanic and likes to joke around alot. He told me I kud...

    2005 Chevrolet Impala LS

    -

    Maintenance & Repair

  • Conversion

    Will my 1987 front end fit on a 1987 LS? Is the frames the same?

    1987 Chevrolet Monte Carlo 2 Dr SS Coupe

    -

    Car Customization

Impala

Looking for a Used Impala in your area?

CarGurus has 29,109 nationwide Impala listings starting at $1,100.

ZIP:

Search Chevrolet Impala Questions

Chevrolet Impala Experts

#1 Js08016
Js08016
Reputation 1,750
#2 Danny Wang
Danny Wang
Reputation 1,640
#3 Tom Demyan
Tom Demyan
Reputation 1,530
View All

Related Models For Sale

Used Chevrolet Malibu
826 Great Deals out of 81,056 listings starting at $995
Used Dodge Charger
279 Great Deals out of 26,750 listings starting at $2,250
Used Chevrolet Camaro
153 Great Deals out of 32,674 listings starting at $1,995
Used Chrysler 300
336 Great Deals out of 20,337 listings starting at $1,000
Used Ford Mustang
362 Great Deals out of 46,831 listings starting at $1,999

Used Cars For Sale

2017 Chevrolet Impala For Sale
29 Great Deals out of 7,040 listings starting at $17,490
2016 Chevrolet Impala For Sale
89 Great Deals out of 4,076 listings starting at $13,305
2015 Chevrolet Impala For Sale
27 Great Deals out of 1,871 listings starting at $11,795
2014 Chevrolet Impala For Sale
55 Great Deals out of 2,528 listings starting at $10,495
2013 Chevrolet Impala For Sale
42 Great Deals out of 1,472 listings starting at $4,999