I am swapping a 455 block into a 72 GTO that had a 400 in it. Are the 400 mounts on the frame different from the 455 mounts?

Asked by davwilcook Jun 14, 2012 at 08:50 PM about the 1972 Pontiac GTO

Question type: Car Customization

The engine is a 474 cubic inch built to 575HP. the headers are almost touching the frame and a frame mounts.

3 Answers


400 mounts r the same to 455, pontiac never changed the mounts for the different engine options that generation ...however i hope ur looking into getting some stonger mounts, 575hp is in territory for new rear end, tranny?

1 people found this helpful.

yes they are the same , you have an automatic tranny ? headers are a real pain with the 4 speed & i had to relocate the oil filter & some interferance issues with the Z bar with hooker headers.

1 people found this helpful.

if the motor mounts are old you will lose some clearance, now mounts will help

Your Answer:


Looking for a Used GTO in your area?

CarGurus has 182 nationwide GTO listings starting at $10,991.


Own this car?

Share your experience with others.

1972 Pontiac GTO

Review another car

CarGurus Experts

  • #1
  • #2
    Norm Davis
  • #3
View All

Know more, shop wisely


Related Models For Sale

Used Chevrolet Camaro
610 Great Deals out of 8,571 listings starting at $4,000
Used Chevrolet Corvette
729 Great Deals out of 12,514 listings starting at $4,999
Used Pontiac Firebird
17 Great Deals out of 362 listings starting at $5,000
Used Ford Mustang
994 Great Deals out of 21,414 listings starting at $2,500
Used Dodge Charger
779 Great Deals out of 22,168 listings starting at $2,903
Used Dodge Challenger
740 Great Deals out of 18,141 listings starting at $4,990
Used Chevrolet Impala
260 Great Deals out of 4,028 listings starting at $400
Used Pontiac Grand Prix
9 Great Deals out of 186 listings starting at $1,588
Used Honda Civic
1,358 Great Deals out of 28,571 listings starting at $1,100

Used Cars for Sale

2006 Pontiac GTO For Sale
3 Great Deals out of 40 listings starting at $14,007
2005 Pontiac GTO For Sale
16 listings starting at $13,999
2004 Pontiac GTO For Sale
3 Great Deals out of 29 listings starting at $10,991

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.