SLP 1-5/8" header openings...

http://f2.pg.photos.yahoo.com/ph/gta...c=ph%26.view=t


http://f2.pg.photos.yahoo.com/ph/gta....jpg%26.src=ph


My ported SLP 1-5/8" header openings...to be installed along with my L98 cast iron heads also self ported. Hope to have some track time improvements soon...

http://f2.pg.photos.yahoo.com/ph/gta....jpg%26.src=ph

http://f2.pg.photos.yahoo.com/ph/gta....jpg%26.src=ph

 

looks like some good work

 

An easily removed restriction in exhaust flow that also helps the transition into the header from my ported heads.

As cast the header measured 1.2" width and a 1.5" height. After porting it measures 1.3" and 1.6"...which is the actual area for a 1-5/8" header in terms of the diameter.
1.3*1.6=2.08 square inches. Basically the same as 1.625 squared times pi divided by 4.

Nobody ever really mentions this, and it was something I didn't consider until port matching my head to my header. No reason not to do it before bolting on headers.

 

*shrug*


doesnt sound like too bad of idea as long as theres enough meat on the header to hold everything together still.... just match a copper gasket to the ports, then lay the gasket over the header... hmm.....


i may just do this for no reason other then the fact that i can...

 

If your header flanges hang into the port flow path, it's a very good idea to clean them up. That abrupt obstruction creates all sorts of undesireable turbulence, which is a flow killer.

Okay, may not be a big deal for the mild car cruising down the street, but if performance mods have been made, especially towards higher RPMs, it's a good idea to provide a smooth path.

If there isn't enough material to clean up the flange, weld around the tube on the outside first. That's what I did with my 396 headers this past spring (posted pics back in Mar/April).

 

i wonder if theres enough room to make the hooker longtubes mate up to D port heads...

 

Found it. Didn't find anythong on searches before.

https://www.thirdgen.org/techbb2/sho...ghlight=flange


I don't think my headers needed anything that drastic.

 

I had been running those headers since 1997. I never realized how bad they really were until I took them off this spring for the port work.

 

links don't work, I'de really appreciate it if you could fix them.

 

hey, im porting (gasket matching) everything too and i already ported my manifold now i am going to start the heads, but the only bits i can find are for soft metal(dremel). now i kno the cast iron heads arent soft metal but will these bits still be good to use or do i need to go and buy dye grinders?(spelling sux..sry)lol????

thanks for the help
dave