4.1 NA Performance

[Jeep Guy]

I have a 4.1 with stage II heads and Intake 13:1 compression & Professional Products fuel injection in a Jeep flat Fender it used to be a C Modified sand drag car. I get nearly 300 HP at the rear wheels @ 4700 RPMs . My understanding is it has a NASCAR crank the previous owner paid $5,000 for in the late 80s. Does anyone have any ideas for a bigger cam? The cam is not much more than stock and how much more HP can I expect to get out of this motor if I change pistons and put in a bigger roller cam and get to 6500-7000 RPMs
Thanks

 

[charlief1]

Is this a stock block and Stage II heads? Pics would be helpfull but you need 4 more posts before you can put some on.

 

[Jeep Guy]

I guess I should have stated it is the non-production nascar block from the 4.5 v6 class has the Buick racing logo with splayed cap mains

 

[charlief1]

Go to the Stage II section and look for BlownV6. Mike can answer all your questions for you.

 

[Jeep Guy]

Thanks

 

[gbodman]

and here I was gettin excited to do something with my 4.1 boat anchor sittin in the racks, what a tease!

 

[charlief1]

I'm guessing it's NA?

Come to the B4Black section and do some research.

 

[Jeep Guy]

yes

 

[charlief1]

Not you, gbodyman. LOL

 

[gbodman]

Yeah, it's a na from an '83 I parted out. It ran when I pulled it so I figured I would save it from the scrap heap. I thought I saw on a thread around here that they're pretty much the same block as the 3.8? Headed to before black to do some scholarly reading!