smithtc

iTrader: (5)

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

25THRSS

looks like some good work

smithtc

iTrader: (5)

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.

MrDude_1

*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...

five7kid

iTrader: (14)

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).

MrDude_1

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

smithtc

iTrader: (5)

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.

five7kid

iTrader: (14)

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.

25THRSS

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

88GTAbandit

iTrader: (1)

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