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Old 04-19-2013, 03:14 PM
Chevlac Chevlac is offline
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425 Caddy into a Stroker 454

The 425 Cadillac engine is "only" @ 40 lbs. heavier than a stock sbc. The heads are a bit restrictive in stock form & will require some porting in the intake ports especially. The stock exhaust manifolds are a bit "concave" due to clearance issues with the stock '77-'79 front upper control arms in the Cadillac cars that they originally came in. But like others have said, they will respond very well with the same "hot rod" work as the 472 & 500's do. To do the "Stroker 454" thing, first, a Caddy 500 crank (4.304") stroke is needed. Then, a set of Oldsmobile (mid to late '60's) 425 c.i. (6.998" long) the Olds 7" connecting rods will be needed also, along with a set of EGGE Machine Company .040" over Oldsmobile 350 pistons will be needed too. The stock Olds 350 pistons are 4.057", so + .040" makes them a 4.097" diameter. A stock Cadillac 425 bore is 4.082" so, with a .015" over sizing will bring the bore of a 425 Caddy engine to 4.097" So let's do some math here, 4.097 X 4.097=16.785409 X 4.304 = 72.2444 X .7854 = 56.740751 X 8 = 453.926 rounded off to 454 c.i..

That's actually closer than a Chevy 454 Big Block engine.

I did this "thread" on www.500CID.com a few years ago.

& it's "archived" on www.cadillacpower.com .

Last edited by 68NovaSS; 04-19-2013 at 05:33 PM. Reason: Cut and Paste Rule
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