425 Super Rocket

80GPLJ · Guru

425 Super Rocket

67HEAVEN · Poncho Master!

80GPLJ wrote:

How does a 425 cu in Super Rocket sound in a Poncho?

Depends on the exhaust you choose. biggrin

427carl · A Poncho Legend!

67HEAVEN wrote:

80GPLJ wrote:

How does a 425 cu in Super Rocket sound in a Poncho?

Depends on the exhaust you choose.

and are you squealing 1 tire or 2? evileye

80GPLJ · Guru

FLOATING THE IDEA OF 425 IN MY GP IN PLACE OF SBC, 2 TIRES BY THE WAY, DUAL EXHAUST

Beaumont4008 · Uber Guru

I had a 425 in a 66 Old delmont 88 four door hardtop. That car would burn the tires to the rims with a car full of screaming teanagers. Tons of torque. And that was with a two barrel carb. Its a big wide engine, can you make it fit ?

427carl · A Poncho Legend!

80GPLJ wrote:

FLOATING THE IDEA OF 425 IN MY GP IN PLACE OF SBC, 2 TIRES BY THE WAY, DUAL EXHAUST

OH! you were serious wink

I would think that since a 455 Olds will fit in a Buick Apollo that it will fit in GP with the right color and emblems, it would be a sleeper motor go for it Mr Hot Rodder biggrin

80GPLJ · Guru

going to size up engine today, have a buyer for the sbc at a premium price

87 player bird · Poncho Master!

Just remember sbc parts are alot cheaper than bb olds parts.

80GPLJ · Guru

I know, but the sbc didn't really turn my crank at first, this 425 seems interesting, going to check on it today

gparis7 · Canadian Poncho Superstar!

If I was going to swap anything other than a Pontiac motor it would be a 430 or 455 Buick. Now they have torque. Even a 350 2 bbl Buick will smoke the tires at will. I've done it in 69 and 72 Skylarks with 350s.

im2ner · Addicted!

425 BBO is the same physical size as a 455 BBO
all big block olds are the same size & all the small blocks are the same (215 aluminum motor & early pre 64 i believe )

my 425 is actually a 425 crank (steel) in a 455 block
lots & lots of torque but weighs a ton , probably 150lbs more then a cast iron headed SBC

be careful with the engine mounts
-- cutlass supreme mounts the engine lower & to the left
-- the motors are very wide so you need to pay attention to the booster & a/c box if applicable