Mods for a 4.9
Posting Guru
Joined: Sep 2004
Posts: 1,556
Likes: 5
Realistically, you would expect to pay $500-1000, for port work and to have the head rebuilt. If your just looking to pep up a head for a mild engine, the port work alone would run you the cost of a grinder and bits, cause you could do it yourself.
You wanna have the head checked for cracks first, before you do anything, especially an efi head.
Then port the head.
Once you have it ported, take it back to the machine shop.
You wanna have the head checked for cracks first, before you do anything, especially an efi head.
Then port the head.
Once you have it ported, take it back to the machine shop.
Freshman User
Joined: Dec 2003
Posts: 44
Likes: 0
Originally Posted by HunterSThompson
Head and valve work won't do squat with a stock cam shaft - and a decent cam won't work for sour owl crap with stock compression. It's a package.
Head work, cam, boost compression, intake, exhaust, ignition upgrade ... do them all at once and choose each portion of that to work together with all the others. In other words, don't switch to a radical race cam if you aren't also going to boost the compression a whole bunch, switch to an intake that can flow a lot of air, port the heck out of the head, upgrade the valve train, switch to full length headers, etc..
Posting Guru
Joined: Sep 2004
Posts: 1,556
Likes: 5
Originally Posted by HunterSThompson
Head and valve work won't do squat with a stock cam shaft - and a decent cam won't work for sour owl crap with stock compression. It's a package.
What your not factoring in, if you go with a smaller aftermarket camshaft aka RV, its function is to build cranking cylinder pressure with low compression engines build low rpm power, good for the street. Where a higher grind camshaft is designed to bleed it off somewhat, due to higher static compression ratios.
The stock 300 head is restrictive. Luckily you can mill the head a little more than usual, for increased compression, all part of the machining process.
One very good example of why a large camshaft is not required, look at Col Flashmans build.
I agree a combination of modifications have the ability to make more power in the end but bigger isn't always better.
Last edited by Motorhead351; Oct 19, 2005 at 09:31 PM.
