427 Tall Deck?

Hello Everyone,

I have a few questions concerning a Chevy 427 TD Truck Motor.
A friend salvaged this engine from a 1980 Crew Cab Pick-Up. I later got the engine from him to install in my 87 Suburban. I intend to modify the engine for more power before I do the install.
I have done alot of searching for info on this engine, but have not found enough info to help me make any decisions. I do know that the engine is taller than a standard big-block and will not accept pistons for those engines. I wanted to raise the compression ratio, but the high comp. pistons for this engine are far to expensive for this application. I have gotten suggestions about having the deck and the heads milled to achieve the higher ratio that I am looking for. I have gotten other suggestions about swapping the heads with a set of closed chamber castings. Any ideas on the best route to take?

Another thing is a suggetion that I got stating that swapping the crank with one from a 454 will gain cubic inches without any modifications. Is this true?

The intake for a standard deck big-block will not work on my engine without the use of spacer plates. The cost of an aftermarket intake and the spacers is outside of my budget at this time. Did G.M. make a factory performance intake for their tall deck engines?

Finally, does anyone know where I can find out what the factory stall speed is for the torque converter in my Suburban? It has a diesal with a 700R4 tranny.

Below is some info on the 427 and any suggestions are welcome.

1980 Chevy 427 tall deck
4-Bolt Mains
Steel Crank
8.0:1 cr
113 cc open chamber Oval port heads

Hi.. I just finished building the 427 tall deck engine, and we're going to fire it up this weekend. There are some great books out ( I've got a couple) that give step by step options to building a stroked 427, i.e. putting a crank from a 454, which fits perfectly, and installing .4 in. longer connecting rods to standard pistons, and .4 in. longer pushrods. it's pretty simple. I started with a bare block, went .30 over, installed the 454 crank, the rods and pushrods I mentioned, a new intake for the tall deck and away I went. Most everything was standard. The new intake was already machined to accept a standard distributor. I'm expecting to have some header clearance problems, but I'm trying to anticipate them. Let me know how you're making out.

Hi after reading your post i was currious why you wanted more compression out of this engine?
I personally have this exact same engine in my truck right now in a 1976 scottsdale stepside truck this motor is a monster right out of the box if you plan to useit for a daily driver this beast will do about 120mph just the way it is with a stock turbo 350 tranny with a few shift mods you can melt the tires clean of your truck.
most of these motor are industrial blocks with smaller peanut valves and big compression we call the stump pullers, you can boost power by adding a few simple toys first off ditch your manifold and use a edelbrock airgap it the very best choice for this motor period and it will keep your fuel cooler then by a becool radiator with electric fans make sure you use at least a 1000 cranking power battery or you will have issues you will have to mod your driveline as well and rebalance it or you could have some serious problems down the road if you hot rod it , you will need a billet distributer edelbrock has a real nice one with a extendable shaft, next make sure you upgrade to a better altinator and a heavy bat cable set this includes a heaver duty starter remember these are heavy truck engines they need the thing mentioned for best power, next use at least a 800 cfm carb with a real big aircleaner not so show thin cleaner it will only clog add larger feul lines and a forward force electric pump make sure you get a quite one unless you like the pump noise be sure you use slightly taller motor mounts you may also have to pound in the fire wall or cut out a small area to make the motor go in as we found out the hard way as the haed on the right side hangs up every time in these vehicals next ditch the headers have the factory cast honed or solidified the inner casting we used corvette v-force exust a real nice rumble and quite when in idel use a matching edelbrook ignition a super hot one this setup uses the stock peanut heads and the power is factory awsum and a real tire melter now you can upgrade to more powerful heads right out of the box we used merlin's world product is the maker just be sure to upgrade to better rear gear to match you will have a real bullet for a suburben i guarentee it my
speedo reads 200mph i hit 158 with this setup on super with octain boost from auto store enjoy if your racing gator performance in sedro wolly washington is the best in our state this guy dreams about super chevys and then delivers period have fun hope it helps chevy sell the stock block rebuild kit you will have to order it

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Originally Posted by drlindz

Hello Everyone,

I have a few questions concerning a Chevy 427 TD Truck Motor.
A friend salvaged this engine from a 1980 Crew Cab Pick-Up. I later got the engine from him to install in my 87 Suburban. I intend to modify the engine for more power before I do the install.
I have done alot of searching for info on this engine, but have not found enough info to help me make any decisions. I do know that the engine is taller than a standard big-block and will not accept pistons for those engines. I wanted to raise the compression ratio, but the high comp. pistons for this engine are far to expensive for this application. I have gotten suggestions about having the deck and the heads milled to achieve the higher ratio that I am looking for. I have gotten other suggestions about swapping the heads with a set of closed chamber castings. Any ideas on the best route to take?

Another thing is a suggetion that I got stating that swapping the crank with one from a 454 will gain cubic inches without any modifications. Is this true?

The intake for a standard deck big-block will not work on my engine without the use of spacer plates. The cost of an aftermarket intake and the spacers is outside of my budget at this time. Did G.M. make a factory performance intake for their tall deck engines?

Finally, does anyone know where I can find out what the factory stall speed is for the torque converter in my Suburban? It has a diesal with a 700R4 tranny.

Below is some info on the 427 and any suggestions are welcome.

1980 Chevy 427 tall deck
4-Bolt Mains
Steel Crank
8.0:1 cr
113 cc open chamber Oval port heads

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Do you realize that the first two posts are 9 years old and neither have posted again?

????????????????

what lanquage is that written in??????????????

Don't get too far from home out there as the cost of fuel for the tow trucks is high$$$$$$$$$$$$$$$