Are the 84-58 engines the same as the 86-87?

[87grandnational]

Are they the same? Or are they different, and if their different, how so?

Could i just Take the headers off a 86-87 and add a 86-87 Intercooler and make it into a I/C car?

Just some questions, cause im going to buy a 84 Hot-Air GN for around $1,700.00

Need some go-fast sugguestions please!

PS: I know the stock boost for the I/C cars is 15psi. How much is the Hot Airs? 12.5? 13? 13.5?

 

[BRAD_PADGETT]

The 86/87 engine setup is totally different than the 84/85. In order to change an 84/85 to an 86/87 you will need a donor 86/87 car in order to get all the brackets/ intake/ intercooler/ computer and on and on and on. You can also upgrade the 84/85 using the recipe's on GNTTYPE.ORG for upgrading the 84/85. I have a restored 85GN and improved it to the stock 86/87 level. The math is- the 84/85 car is cheaper to buy and more costly the improve. The 86/87 car is more expensive and cheaper and easier to improve. I think that in the end it all equals out.

P.S. If I felt that I had a need to go into the 12's I never would have went with the hot-air. I am happy were I am at because eveybody thinks that my 85 GN is an 86/87. Only real fans of the cars can tell the difference. Make sure you know what you want the car to do before you jump into our world. Brad

 

[racemybuick]

If you want to convert an 84-85 GN to an 87, just buy the whole motor from an 87, or save some more $$$ and get the 86-87. It is a huge hassle to convert...If you want a rare, and possibly more valuable car in the future, go with the hot air and make it 100% stock and mint condition, and wait for the greenbacks! Going over the numbers, there were 20,000 1987 GN's and only 4021 84-85 GN's combined. Soooo...do the math...The only more rage GN is the GNX, next to the 84 GN and the 85 GN, so if you cant have a GNX, get an 84 GN and wait! The calue will go up, it is all just a matter of time!

John