Okay guys, I have somewhat decided on the rout that i want to go with building up my Z. Now I need your help as there are so many options out there. First let me tell you what I want to do genereally:

I want to build either a 408 or 427 ci motor that is capable of handling a lot of boost from a supercharger and maybe also some NOS on top of that.

Now here I run into my first real problem. There are many options with the two motor choices: a) should I build up a stroker using the Lunati kit Tbyrne has (they have both the 408 and 427) or b) should I buy a new block with the internals in place and go from there in terms of FI.

Also, I have Trex cam sitting around that I would love to pop into which ever motor I get, give me your opinions on whether this is a good or bad idea with any of the 4 potential motor setups (408 stroker, 427 stroker, 408 block, 427 block).

Please guys help me get this motor started, every time I start looking at one specific setup another one seems to pop up that is just as good if not better.

All suggestions are welcomed as this will be a long term project; since I want to make sure I get things right. If you have any specific parts in mind that are capable of handling a lot of boost or blocks that are well built let me know so that I could give all of my options full consideration.

Your help and feedback is greatly appreciated.

 

How much power do you want to make and how do you plan on using the car?

 

I want to be able to drive it on the street some, mostly as a weekend car. Looking to make around 700rwhp.

 

427's are not cheap, mainly because you need a sleeved block that has a bore that large. These usually run $3000-$6000. For a boosted/nitrous motor, I would go with a 402 or a 408 iron block. The only difference between the 402 and the 408 is that the 408 block has been bored .030" over, for a final bore of 4.030". If you want to save a little bit of money, you can get an LQ9 block(4.000" bore iron block), not bore it over, and put in a 4" stroke rotating assembly, for a 402. It will hold tons of power depending on the quality of the bottom end you decide to use. A TRex cam would do well in a 408. You might even want to go with a larger cam than that.

 

Iron block 408 or 402 is right up your alley. T rex is a medium sized cam in a big cube motor. Plus it may not be an ideal blower cam. Talk to some sponsors and tell them what youre looking for. Theyll spec out a custom cam for your application.

 

Okay so it seems most of you favor the 408 which is what I was leaning towards myself. No one has said anything about the possibility of stroking the facotry block (this seems like a much more viable possibility with the 408, rather than the 427). Is this because the iron block would be much better equipped to handle gobs of boost?

Also, considering this setup I want to get heads so I would welcome any suggestions: What are good boost/N2O heads for either a stroked or built iron 408 block. AS always your views, insights, and opinions are welcomed and appreciated.

 

The Iron block is stronger, plus people do it because the stock block would need to be resleeved to accomodate a 4" bore. The iron block cheaper and stronger at the cost of weight, although on a FI setup that isnt too big of a deal.

 

I like the aluminum 402's, always making good results w/ proper heads/cam package. Many companies make 402 shortblocks with very impressive internals what will suit your needs. Wont be getting 700 N/A but those engines can turn!