HI, I am building an engine and was curious about how you make the runners larger in the base, I have SLP runners and would like to enlarge my base ports on the runner side. I know they are round so I just dont want to try and port them like the head side, because Its hard to make a perfect circle. Do the make a bit to enlarge it, I dont have the money to do an extrude hone, please if anyone can give me any ideas please help.....THANKS

 

Just get out the die grinder, a carbide bit and grinde away! I opened mine up to match some SLPs that i worked on. Make sure you properly modify some gaskets to make it all fit right too. I ended up just using some TPIS bigmouth gaskets and opened the base and runners to match those. They wont be perfectly circular, but you can make it close. Due to the way the stock base is you have to take more from certain areas than others anyways. Otherwise you run the risk of punching a hole through in places where there isnt much meat.

 

Do a search for prototype TPI intake.

I compared it to my heavily ported stocker and it is in the pics.

There is alot of meat to remove if your on a budget or seeing how far stock will take you

later
Jeremy

 

MAN SMURFIN, looks like you opend that sucker up, is that the factory intake, that sure looks good. So you done that with just porting tools. Have you fired that thing up yet, bet it sounds good. If you have some more shots of it would you please send it to me or post them, maybe some close ups so I can see what you have done...THANKS

 

Yes that is the stock intake. And yes I have it running. It pulls alot harder above 5,000 rpm and doesnt fall on its face at 4,500rpm. Yes, I have some more pics I can post but thats on another computer so I will have to do that later. All I used was a cheap air die grinder and several different shaped carbide cutting bits.

 

Thanks SMURFIN, do you know if when you port the SLP runners also, can you cut the tangs bout of the tubes, so far I have just blended them in and looks like it should not be a problem to just remove them because it looks like there is enough meat, I just dont want to cut it out if it will hurt them..THANKS

 

hey, sorry it took so long. I had some issues finding the files. I hope these help. I know the port job isnt as extreme as some, but it is more than adiquate for my LB9. There is much more room for porting on the side of the base that goes to the heads, but as of now my heads are stock so they are untouched for now.

 

Thanks SMURFIN, for taking the time to find those, looks like you have them opend up pretty good, and thats good to know it does pull past 5k now, also what style runners are you running, Thanks for the help....

 

I am using SLP runners, they are ported, and i spent some hours on them but they are not way extreme. I will look to see if i have anymore pics maybe of the plenum and runners.

 

I might have an extra base if you want one zeeyaa

 

How much do you want for the base 91RS?

 

Hey i need some help ,i have a 350 tpi and this week am porting the stock intake but i would like to no will i have to get some special gasket for the tpi base manifold once i part it apart and port it to put it back together,if so were can i get it i want to port it similar to how you did your stock manifold ,thanks alot i would appreciate it.

 

the Mr. Gasket catalog shows a set of TPI gaskets that have a slightly larger port opening. you might try those.

 

or the tpis bigmouth base gaskets