GN block question

[87regalkid]

I recently pulled my normally aspirated v6 from my 87 regal to make room for a gas guzzeling 350 sbc. Anyway, I looked up codes and found that it is a 109 block with 445 heads, which are the same from the GN, I think. So besides the intake, sfi, what would have to be done to make this motor strong enough to accomodate a turbo, if anything, are there any other serious changes between the basic regal v6 and the gn?
-Thanks for any input,

 

[dogsht]

I don't think you need anything to use it. Check www.turbobuicks.com

 

[chevy2480]

The block and heads are the same in order to use it in a turbo application you need to change the pistons because they are different. If its got dot 2 rods you can use them. The crank is different but i know a few guys running the na crank and getting away with it. A turbo crAnk has rolled fillets on rod and mains that make it stronger. You need a Turbo harmonic balancer with reluctor wheel. Also block need to be drilled for oil return. As it sits you can not just put a turbo on it will not work. Yes the blocks are the same but a few of the internal parts are not the same. So as it sits it will not work. But dont junk it the blocks are getting harder to find and bring good $$$

 

[87regalkid]

thanks guys, i dont want to just throw it away because when it was pulled it had less than 70k on it and i pulled the valve covers, and the thing looks to be in great shape. I might seriously consider lookin to rebuild this as a beast. Any other input of course is greatly appreciated.

 

[87regalkid]

I don't want to sound stupid, but what are dot 2 rods and how do you tell if you have them?

 

[chevy2480]

I don't want to sound stupid, but what are dot 2 rods and how do you tell if you have them?

You dont. Drop the pan if you look at the side of the connecting rod you will see 2 big dots cant miss them. If it got more then 2 dots they are not the correct rod.

 

[87regalkid]

Alright, i see two big dots and a number that i think says 268 on the rod as well. Also, do you or anyone know the crank number code for the GN, I couldn't find any big numbers on mine, just a few little digits in different places, they read
L 25
DN
GM2
K I think, it's hard to tell.

Thanks,

 

[chevy2480]

Alright, i see two big dots and a number that i think says 268 on the rod as well. Also, do you or anyone know the crank number code for the GN, I couldn't find any big numbers on mine, just a few little digits in different places, they read
L 25
DN
GM2
K I think, it's hard to tell.

Thanks,

The crank casting numbers where the same. The difference was on the rods and mains fillets where cut in which supposably strengthed the crank. I had a na crank with rolled filets on just the mains the rods didnt have it. The turbo crank recieved this on both. The rolled fillet will look like a round groove cut next to where the side of the bearing would be. To put it simple it will be in the spot if you remove the bearing where the oil left a hazy spot.

 

[87regalkid]

First, there is a guy locally selling 84-85 GN stuff, do they have the same crank as an 87 by any chance? Second, what can NA cranks handle as far as power, I don't know if it's worth changing because I don't plan on making 1,000 horse or anything, just something respectable.

 

[dogsht]

Yea pretty sure 84/5 crank same as 86/7 turbo crank. When people start breaking into the 11s with a naturally aspirated crank they don't last long. Maybe 450 HP 500 TQ with regular radials might be on the edge of reasonable durability. Kinda hard to say. With a good fuel pump scan tool and downpipe its not hard to make 450HP with a GN. Used turbo cranks don't yet command the money they will in my opinion. New turbo cranks are like $750 if memory serves me. You can still buy new NA cranks for $179.