CLASS RACER FORUM - View Single Post - questions on 8.1 motor in 2004 Chevy truck

Alan Roehrich · 05-20-2016, 09:57 PM

I'm behind on my projects, but I'm actually developing a kit to convert the 8.1 to adjustable shaft style rocker arms, under the stock valve covers. If you're keeping the stock camshaft, you can use 1.8:1 rocker arms for a little boost in power. If you're changing cams, you'll probably want 1.7:1.

The intake manifold can be modified to solve the PCV problem, and also for about a 30HP gain, by cutting it open to remove a baffle or two and doing some porting. The stock PCV system inside the intake manifold is closed off, and the PCV system is run externally at the oil filler tube (you won't want to add oil with the engine running).

My personal truck will be getting a set of Hedman headers and 3" true dual exhaust.

05-20-2016, 09:57 PM	#6
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,133 Likes: 1,605 Liked 1,915 Times in 430 Posts	Re: questions on 8.1 motor in 2004 Chevy truck I'm behind on my projects, but I'm actually developing a kit to convert the 8.1 to adjustable shaft style rocker arms, under the stock valve covers. If you're keeping the stock camshaft, you can use 1.8:1 rocker arms for a little boost in power. If you're changing cams, you'll probably want 1.7:1. The intake manifold can be modified to solve the PCV problem, and also for about a 30HP gain, by cutting it open to remove a baffle or two and doing some porting. The stock PCV system inside the intake manifold is closed off, and the PCV system is run externally at the oil filler tube (you won't want to add oil with the engine running). My personal truck will be getting a set of Hedman headers and 3" true dual exhaust. __________________ Alan Roehrich 212A G/S