i'd say go for the 408 with stock heads that are mildly ported on the exhaust side only. keep the cam very mild and simply shoot for around 500rwhp. keep in mind that a 500rwhp 408 should stomp a 500rwhp 370 since it will have considerably more torque. if you were able to run 8psi of boost on a 10:1 compression 408 i think you'd find 60' times in the low 1.7's (if it hooks) and from there out it wouldn't take much to make the power to run low 12's to high 11's. a 4k-5k 408/402 should be all you'd need. replace it as a short block assembly only (except with a touch more cam) and go from there. there is no reason to start off with $2500 in heads and all other stuff that you never even ran on the 6.0L. just do the short block with around 10.0:1 compression and you'd have a happy daily driver that has alot more room for future mods without having to sell the first born. some people just don't get the idea of adding cubes. you don't have to make it a complete package. the short block alone will do the job to get you started.

 

I like the way you think.

 

Dan~ Your still not going to catch me

 

8ALTNG how much compression does your motor have? I want to run atleast 15psi but maybe upwards of 20psi. I know your running like 17 pounds and thats about where I want to be. If I use my 5.7 heads Ill be at 8.9-1 if I use my 6.0 heads Ill be at like 8.4-1. Didnt mean to still the thread

 

I think you are still leaving something on the table. My afr is 11.5 as well but I have had a lot of success with timing. I know it isn't the same motors but the hp at 18* timing is similar with 1.2L less. I have seen a huge increase in power with timing. Going from 18* to 23* was the biggest difference, I now have 30*. I will have some new hp #'s in a week or so that I will be sure to post up. I am running 93 octane, if that makes a difference.

 

I am running 8.5:1 cr. I am also running 5.7 heads. Then have been worked over like 3 times. Also stacking acouple commetic gaskets can help lowering your cr.

 

Well then, here it is!

http://www.whipplesuperchargers.com/...sp?ProdID=1221

 

Throw a radix on it. We all know that could handle it

 

it's a bit easier to run more timing on a short stroke engine, but more important is that you're comparing a non-intercooled timing curve to an intercooled timing curve.

 

Yeah. I was basically implying that he needed to intercool it. But with the money he seems to be willing to spend then there isn't much need to mess with it on this motor.