Porting a stock LT5
 

Need info on Porting. Lots of Info (Links).

So what is the best set-up for a Stock engine?

Is there any advantage to porting the Heads on a Stock engine?

How big should the porting be? 35MM/34MM

Tools, what are the best tools for this job? Die grinder bit sizes ect..?

Re: Porting a stock LT5
 

36mm and yes port the heads.

Re: Porting a stock LT5
 

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

Re: Porting a stock LT5
 

And paint them Atomic Orange right?

Re: Porting a stock LT5
 

Porting heads is a tricky piece, I have seen a few heads sent to the gods of speed due to misalligned porting....and ZR-1 heads are not easy to find and not easy to fix. Watch out for water jackets.

Re: Porting a stock LT5
 

I do not want to F..up the heads. Risk vs. reward. Is it worth it? I do not want to mess with the engine it seems to me to be a low mile motor. I'm thinking maximize with bolt on?s and top end porting. But I have no fear it is a spare motor

Re: Porting a stock LT5
 

I am a big do it yourself person, but if you do not know the weak points of the head, you need to stay smaller on ports, going 35/36 is a recipe for disaster......you can damage the area under the lifter or go through a water jacket, there are some very thin spots, and even people with experience have trashed sets.

Pete is not cheap but I know he is an expert at it. I have done a lot of intakes but I would not wander down a head port without a guide to help.

Be careful.....

Re: Porting a stock LT5
 

Lee, that very good advice and based on your advise I?m planning on staying away from the heads. One of the reasons I bought the engine is so I could "do it myself" and learn.

Re: Porting a stock LT5
 

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.

Re: Porting a stock LT5
 

Naw, that's my thing...Pete won't work on them if you paint them AO