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Old 08-20-2003, 09:23 AM
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427 rat ???

I've heard of a 427 rat motor. is this real, i've only ever heard of it once as a kid. was it good?? does anyone know??please help

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Old 08-20-2003, 09:36 AM
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Well "rat" usually refers to a Chevy big-block.(mouse refers to a small-block)

If this is what you mean then yes there is a 427 rat. I have one.
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Old 08-20-2003, 11:20 AM
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I don't really know, but I've always thought it was either a destroked 454 or a stroked 396. I've heard it's a high rev'er, so I thought more towards the destroked 454.
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Old 08-20-2003, 01:49 PM
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You COULD think of it as a destroked 454, but the 427 came first, so the 454 is a stroked 427.
396 = 4.095 x 3.76
427 = 4.25 x 3.76
454 = 4.25 x 4.00
IMHO, the best big-block made was the 427. And with Tri-power ..... KILLER! (435 HP)
There's nothing like the sound of a 427 w/solid lifter cam and headers.
I worked for a Chevy dealer through the heart of the musclecar era, '65-'69. Hi-Po 396 Chevelles and Novas, 427 Impalas and Caprices ... and, yeah, those 427 Vettes. Ah, those were the days.
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Old 08-20-2003, 02:57 PM
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Was I right to say that they were a high rev'in BBC (at least )? If so, what's the Red Line of a "High Rev'in" BBC?
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Old 08-20-2003, 05:01 PM
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Actaully there is a bore/stroke combination to make a 427 small block too.Is there a sticking out tongue smilie around here somewere??
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Old 08-20-2003, 05:34 PM
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Yup
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Old 08-20-2003, 06:08 PM
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I run a 427 rat in my car.It is actualkly a 440 nw because it is bored .060"over.I made mine by putting a steel 396 crank into a 454 block,but it was also a factory offering.I spin mine to just a tick under 8000rpm with a GM crank,and 2 bolt main block,so it does spin pretty hard.Stock L88 corvette versions of the 427 made peak power at a little under or around 7000 rpm in stock form,so they were screamers too.
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Old 08-20-2003, 10:23 PM
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I wasted big bucks to get some ponies from the 350 in my vette. what i should have been looking for was an old school bus with a big block.a nice set of heads , BIG CARB , , oh man.
does anyone here have some exact specs of what type pistons, optimum bore, wich connecting rods etc, this may hook up nice to my power glide c/w4000 stall .
anyone know the good heads #s, does the journals on the crank nee to be taken down??? mike.
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