72 Cutlass / 425 super rocket

1972madison · 07-22-2007, 11:25 PM

i might buy this motor for my 1972 cutlass, would it fit into my car ?

Here is what the guy said:

Description: I have a 425super rocket ultra high conpression It has 1500 mile since it was rebuilt This moter has 390 horse power and it is stock It has a 400 turbo tranny cross member and drive shaft and is ready to install this moter is VERY FAST so be prepard I'M asking $500 Canadian

WOULD IT FIT ?

2blu442 · 07-23-2007, 05:40 AM

Yes it would. Externally it's the same as a 455 so if you use the correct motor mounts and exhaust manifolds it should fit just fine. John

joe_padavano · 07-23-2007, 07:32 AM

Quote:

Originally Posted by 2blu442

Yes it would. Externally it's the same as a 455 so if you use the correct motor mounts and exhaust manifolds it should fit just fine. John

First, simply use the motor and frame mounts already in the car. If you buy 455 motor mounts, you'll need to change the frame mounts to match. If you keep the 350 mounts, the motor will bolt in with the 350 frame mounts. Olds motor and frame mounts are dimensionally equivalent if you use them in matched sets, but don't mix and match - they won't fit.

If the trans is out of the same full size car as the 425, it will almost certainly be a long tailshaft TH400. It will fit in an A-body but will require a custom shorter driveshaft. Your current crossmember works fine.

1972madison · 07-23-2007, 10:55 AM

does this sounds like a good engine ?, is this kind of engine built good ?

2blu442 · 07-23-2007, 10:11 PM

Personal preference, the 425 was never put in the Cutlass/442 line but only used in full sized cars. They do have a forged steel crank which is stronger than cast iron, and a shorter stroke than the 455. Bolt on parts will interchange, like heads, intake and exhaust manifolds, but internal parts such as lifters and pistons are harder to find for the 425. The 455 was made for more years and is a newer engine. I like them both, and if you find a good deal on one or the other I would take it. That's my 2 cents worth.

1972madison · 07-23-2007, 10:13 PM

But is the 425 super rocket build strong, and would it have some power ?

shaks 442 clone · 07-24-2007, 12:16 AM

Quote:

Originally Posted by 1972madison

But is the 425 super rocket build strong, and would it have some power ?

390 horsepower is a ridiculous amount of hp stock so yes it will be a strong motor an also a powerful one

07-22-2007, 11:25 PM	#1 (permalink)
1972madison Member Join Date: Jun 2007 Posts: 38	72 Cutlass / 425 super rocket i might buy this motor for my 1972 cutlass, would it fit into my car ? Here is what the guy said: Description: I have a 425super rocket ultra high conpression It has 1500 mile since it was rebuilt This moter has 390 horse power and it is stock It has a 400 turbo tranny cross member and drive shaft and is ready to install this moter is VERY FAST so be prepard I'M asking $500 Canadian WOULD IT FIT ? __________________ -1972 442 with a 425 super rocket-

07-23-2007, 05:40 AM	#2 (permalink)
2blu442 Senior Member Join Date: Sep 2006 Location: Medford, Oregon Posts: 806	Yes it would. Externally it's the same as a 455 so if you use the correct motor mounts and exhaust manifolds it should fit just fine. John __________________ 1964 Cutlass Factory 4spd 1965 442 4spd 1967 442 Auto 1967 Cutlass Convertible 1968 442 Auto 1969 442 W30 Auto 1970 442 4spd 1971 Cutlass Flat Top Wagon 1973 Che*vy 3/4 Ton 454/TH400 Tow Vehicle Only the tow vehicle is finished!

07-23-2007, 10:55 AM	#4 (permalink)
1972madison Member Join Date: Jun 2007 Posts: 38	does this sounds like a good engine ?, is this kind of engine built good ? __________________ -1972 442 with a 425 super rocket-

07-23-2007, 10:11 PM	#5 (permalink)
2blu442 Senior Member Join Date: Sep 2006 Location: Medford, Oregon Posts: 806	Personal preference, the 425 was never put in the Cutlass/442 line but only used in full sized cars. They do have a forged steel crank which is stronger than cast iron, and a shorter stroke than the 455. Bolt on parts will interchange, like heads, intake and exhaust manifolds, but internal parts such as lifters and pistons are harder to find for the 425. The 455 was made for more years and is a newer engine. I like them both, and if you find a good deal on one or the other I would take it. That's my 2 cents worth. __________________ 1964 Cutlass Factory 4spd 1965 442 4spd 1967 442 Auto 1967 Cutlass Convertible 1968 442 Auto 1969 442 W30 Auto 1970 442 4spd 1971 Cutlass Flat Top Wagon 1973 Che*vy 3/4 Ton 454/TH400 Tow Vehicle Only the tow vehicle is finished!

07-23-2007, 10:13 PM	#6 (permalink)
1972madison Member Join Date: Jun 2007 Posts: 38	But is the 425 super rocket build strong, and would it have some power ? __________________ -1972 442 with a 425 super rocket-

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