LS1Formulation

iTrader: (13)

I have ported around 6 sets of LT1 heads in the past, about to do another set in the next week or so. I get good numbers out of the heads, so I know what I am doing, I just never have ported ANYTHING but standard small block chevy style heads. What I am curious about is what sorts of things I need to look out for when porting LS1 heads. Typically on LT1 heads, I raise the port roof, narrow the valve guide bosses, and blend the bowls. I know on LS1 heads I don't need to do anything with the port roof, but will I see good gains narrowing the guide bosses and blending the bowls? Also, I'm planning on buying a pair of take off heads to do this work to, which casting numbers would be the best to work with? Thanks in advance!

DONAIMIAN

iTrader: (18)

The cheapest ones you can find. Even a trashed head as long as it has one good cylinder. Flow it before, then flow it after so you can see how you did.

LS1Formulation

iTrader: (13)

No one ports their own heads?

Abdullah

iTrader: (2)

maybe this link will help you :


https://ls1tech.com/forums/showthrea...60#post4407860

allngn_c5

iTrader: (3)

Good Luck!!!!

Cliff

iTrader: (19)

I hope I can help. I've ported several LT1 heads and to many to count LS1/LS6/5.3/6.0 heads. I have a complete set of test heads which have been cut and drilled so I know the specific depth of all the walls/floors etc. It sounds like you have the right idea. LT1's are different in several areas. Really they are not the same animal. Totally different. LS1 casting has different thickness and varies with each type of head, so you cannot port them the same due to thickness in the walls. It's very easy to hit water in the bowl. If you are porting the late model LS1 (2001 and newer) are better then the 98 style head. If you want specifics pm me and I try to help you out.

LS1Formulation

iTrader: (13)

Thanks for the help, those pics helped a lot. I'll be shopping around for some newer LS1 takeoffs to port and hopefully someone will have one junk head laying around so I can practice prior to doing that.

GuitsBoy

iTrader: (4)

I had practiced on a junk head before i did my real heads. Bo white and xfactor_pitbulls both have excellent information posted on the site about porting stock heads.

I mostly concentrated on trimming down the guides and rocker bosses, blending the bowls and the seats. I opened up the intake runner sides just a hair. I used sanding rolls just to clean up the whole port afterwards.

DAPSUPRSLO

iTrader: (14)

I have a stock ls1 head laying around if anyone wants it for a reasonable price. I practiced on one stock head, and left the other one alone.