porting intake
01-28-2005, 08:17 AM
#6
Teching In
Join Date: Jan 2003
Location: Ontario Canada
Posts: 31
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I did. At first i used a dremel tool too do it.All that did was rip strips of nylon out.That was a waste of time. Then i did a search and found that 40 grit sand paperwraped around your finger works much better. It took me 8 hours by hand to do it.
I have pp 5.3 heads i made a probe that looks like a T. The width of the t matches my heads intake width. With this tool i was able to reshape the last 3 to 4 inchs of the ls1 intake. Stock the last 3 to 4 inches narrows down to match the stock heads.
Inside the manifold im sure there is another part of the port that has a crossection that is too small. To make a ls1 manifold flow better you would need to cut out the bottom of the manifold and fix that problem to see a flow improvement. I think.
I was hopeing to gain 10 cfm. Everything ive read says i got at most 3 cfm.
If i got 5 cfm im happy.The intake is now port matched.
I also added a techline dfl coating on the intake ports. The last 6 inchs in the the ports. I added a anti heat coating on the bottom of the manifold.
For those who might try this have some jb weld on hand. You will make mistakes especialy if you use a dremel. The jb is used to fill any pits. i have had no probs with any jb comeing out in 2 years of use.
I have pp 5.3 heads i made a probe that looks like a T. The width of the t matches my heads intake width. With this tool i was able to reshape the last 3 to 4 inchs of the ls1 intake. Stock the last 3 to 4 inches narrows down to match the stock heads.
Inside the manifold im sure there is another part of the port that has a crossection that is too small. To make a ls1 manifold flow better you would need to cut out the bottom of the manifold and fix that problem to see a flow improvement. I think.
I was hopeing to gain 10 cfm. Everything ive read says i got at most 3 cfm.
If i got 5 cfm im happy.The intake is now port matched.
I also added a techline dfl coating on the intake ports. The last 6 inchs in the the ports. I added a anti heat coating on the bottom of the manifold.
For those who might try this have some jb weld on hand. You will make mistakes especialy if you use a dremel. The jb is used to fill any pits. i have had no probs with any jb comeing out in 2 years of use.