425 cadillac in a 79 k5 blazer - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DustyNova · 05-13-2015, 10:21 AM

Is this an easy swap? What transmission is the best to use and is the 425 a good motor

77 C-20 Scottsdale · 05-13-2015, 10:40 AM

It would be much easier to use a Chevrolet 454. The 454 has a LOT more horsepower and torque than the 425 Cadillac. It is a night and day difference between the two engines. The 454 would not require a transmission change, either.

DustyNova · 05-13-2015, 11:13 AM

yeah but cant i tune it up to more power than it has and it will be lighter than the 454?
also where can i find an adapter for that and a 700r4 or th400

**jayoldschool** · 05-13-2015, 11:23 AM

If you're thinking, 425, you'd be crazy not to do a 500. Same everything space-wise. BOP pattern TH400 works, or, there are adapters for a Chev pattern 700R4 (but you'd better build it strong to take the torque).

DustyNova · 05-13-2015, 01:00 PM

wouldnt a 425 get a little better mileage or what does a 500 get compared to 454? Bout the same?

05-13-2015, 10:21 AM	#1
DustyNova Registered User Join Date: Mar 2014 Location: Salt Lake City Posts: 128	425 cadillac in a 79 k5 blazer Is this an easy swap? What transmission is the best to use and is the 425 a good motor Last edited by DustyNova; 05-13-2015 at 10:38 AM.

05-13-2015, 10:40 AM	#2
77 C-20 Scottsdale Registered User Join Date: May 2015 Location: Ridgecrest, Ca. Posts: 18	Re: 425 cadillac in a 79 k5 blazer It would be much easier to use a Chevrolet 454. The 454 has a LOT more horsepower and torque than the 425 Cadillac. It is a night and day difference between the two engines. The 454 would not require a transmission change, either.

05-13-2015, 11:13 AM	#3
DustyNova Registered User Join Date: Mar 2014 Location: Salt Lake City Posts: 128	Re: 425 cadillac in a 79 k5 blazer yeah but cant i tune it up to more power than it has and it will be lighter than the 454? also where can i find an adapter for that and a 700r4 or th400

05-13-2015, 11:23 AM	#4
jayoldschool Moderator Join Date: Dec 2012 Location: ON, Canada Posts: 2,176	Re: 425 cadillac in a 79 k5 blazer If you're thinking, 425, you'd be crazy not to do a 500. Same everything space-wise. BOP pattern TH400 works, or, there are adapters for a Chev pattern 700R4 (but you'd better build it strong to take the torque).

05-13-2015, 01:00 PM	#5
DustyNova Registered User Join Date: Mar 2014 Location: Salt Lake City Posts: 128	Re: 425 cadillac in a 79 k5 blazer wouldnt a 425 get a little better mileage or what does a 500 get compared to 454? Bout the same?



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