Porting a stock LT5

[A1990]

Originally Posted by Eric870

Dennis, You have a 368. How much air is enough for a stock 350?

I actually have 396, but I had Marc do his 500 package on my car when it was a 350. 36mm porting and heads ported too. Take a look at what Marc does on his 500 package.

If you are going to do it yourself, I would error on being conservative too.

[LGAFF]

I have 391 rwhp on the 92, without touching the heads, wonder if port matched with 93-95 intake cams would get you low 400s for cheaper, which is close to a 500hp package for a lot less $.

I am doing a port match on the 90 and dropping a few hundred pounds from the car, hoping to match a 500hp car performance....no AC, etc

I almost traded the 90 on a Viper up in WI a month ago, but couldn't walk from the project at this time.

[Eric870]

Originally Posted by LGAFF

Port matching the head is ok, if you go 35-36 on the intake, port match the heads so that the transition is good, but then only go into the head with a taper about an 1" or 2" into the head, also, the port match will not be a circle pattern, it will be a cresent....if you have questions, more than happy to talk, or reach out to the pros.....Pete, Ryan, etc.

No need to port the 2ndry in the head on a port match.

So I thinking i can always take more out later and its hard to put back. 35MM through intakes and taper and port match 1" into the heads. 35MM though the plenum? what kind of gains can I expect from this set-up?

[LGAFF]

If the cam timing is good, 390-400 rwhp....thats about as much as can be squeezed out of it.

[LGAFF]

Save some budget for good tires, grip gets harder to come by at that point.

[Eric870]

Originally Posted by LGAFF

If the cam timing is good, 390-400 rwhp....thats about as much as can be squeezed out of it.

I will check the timing when i receive my new tool

[LGAFF]

Should get it out tomorrow

[Eric870]

Originally Posted by LGAFF

Save some budget for good tires, grip gets harder to come by at that point.

I thinking Headers, DM flywheel and a chip. Thats probably a good start...

[Polo-1]

Go Big or Go Home...... wimps 35-36mm ports

[Locobob]

Why don't you just come over to my place sometime Eric. I have ported heads and intake laying around plus working on another intake right now. I'll give you the grand tour of porting stuff.