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Old 08-22-2007, 12:30 PM
 
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427 Tall Deck

I am looking for a little help. I have a 427 tall deck to put in a 1967 Camaro. I know I will have a few problems, but I think I can over come them. What I need is some advice. I would like for the 427 to have somewhere around 500+ horsepower. The only thing that I will be using is the block and crank. I would like to run solid lifters. I have a 411 rear and a 4 speed Muncie.

I am not going to race this car, just want the power if I needed it. May take it to strip to see what it can do. I am looking for advice on piston, heads, cam, intake, headers,carburetor,timing chain etc.

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Old 08-22-2007, 01:38 PM
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welcome..........I am moving this to the engine forum. You will get better advise there.
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Old 08-22-2007, 06:28 PM
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OK, first, let's get the stack set up right.

The tall deck block has a block deck height of 10.200". Half the 427 crank stroke is 1.880". A standard deck 427 piston has a compression height of 1.770". That leaves a rod length of 6.550". (1.880" + 1.770" +6.550"=10.200") The closest available rod is 6.535" which would put the piston down in the hole by 0.015" assuming a TRUE compression height on the piston of 1.770".

Alternately, you could use a 454 piston with a 1.640" compression height and a 6.700" rod. (1.640" + 6.700" +1.880" = 10.220") This pops the piston out of the hole by 0.020" if everything is true. But if the piston manufacturer fudged on the compression height, it might be real close to a zero deck.

To me, it wouldn't be that big a deal if the piston popped out of the hole a little. Just use a thicker gasket to control the piston/head clearance/squish. I don't know if I'd want to pop it out any more than about 0.010" though and use a ~0.050" gasket (assuming hyper pistons with a tight piston/wall clearance to control piston rock in the cylinder).

Measure the centerline of the crank to the deck to see if the block has been decked in the past.
Get this sorted out and we can continue.

Last edited by techinspector1; 08-22-2007 at 06:43 PM.
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Old 08-22-2007, 08:28 PM
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Have you considered stroking it? These talldecks can make monsterous motors
Shane
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Old 08-24-2007, 08:04 AM
 
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OK I measured the block and it has not been decked. Now what?
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Old 08-24-2007, 08:21 AM
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Just adding info..... plan on either running stock manifolds or spending $$$ on a set of headers as normal BBC headers will not work.
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Old 08-24-2007, 10:46 AM
 
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Ok on the headers, but I plan to run headers, Is it that much difference? I thought it was less then a half inch taller then a standard 427. Maybe a bend here and there could make it fit.
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Old 08-26-2007, 01:34 PM
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"Maybe a bend here and there could make it fit."

Not likely. The tall deck is 0.400" wider at the block decks than a standard 9.800" block. You might peruse these websites to see if someone makes a header for your application. If not, then you're lookin' at around $1,000 for a shop to fab them up.
http://www.roadsters.com/engines/#Headers
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Old 08-27-2007, 07:15 AM
 
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427 Tall Deck

OK. So what kind of combination will put me in the 500 hp range? Again I know that I will have a few problems, but with your help we can work through it. Heads, cam etc.
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