I'm confident enough in my (mad) skillz to try just about anything, and if it's something important, I ALWAYS do my research first until I feel educated enough before I just jump into it (hence this thread in part)... If I just had someone else do my difficult work, I wouldn't learn ****. It's just soooo not my style. Thank you for your constructive posts IrocSS85 and others.

Something I find interesting in the exhaust comparison pic is the short radius of the floors. Notice the 'corner' in the LT1, and how smoothed out it is in the LT4...

 

thats exactly the benefit of a raised port. more of a gentle arc, instead of a 75 or 80 deg turn. I plan on taking some pics of my heads today for ya, to get a better idea of what they could look like when done. the idea of the first pic, is to show that even a complete first timer, can have decent results. even if the ports arent perfect.

my car was no dyno queen, but performed I thought really well at the track. where I wanted it to.

with 3:42 gears (not at all ideal), a nice 3800 stall, 52mmtbody, 383 with 10.8cr, and a undersized cam(233/239 .580 lift. undersized for optimal track times but I already had it sooo....), and a marginal tune it went 11.69. consistant 1.6x 60's. I was happy, and I know there was room to improve if I had time/money.

 

sorry but these are the only pics thaty came out at all. crappy camera. see the blue tool holder I have it full of diff. sand paper drums. diff. sizes/grits of what you see here. but realy all you need is the course ones.

I'll try to get better pics tomorrow as well as those pro pics I got. was looking at them yesterday and really there's only a few that are good pics.

chris

 

oh yeah, first pic,upper right corner. be careful when grinding that the bit doesnt come out of th eport. or it'll walk across the sealing surface and do that. DOH! be very careful of that on the head gasket side. but thats why I save the milling till after the porting. that happened the first time around and didnt give me any trouble's.

the valves, are actually ls1 valves. used them in the head to protect the valve seats. grind down the combustion chamber side flat until the first angle of the valve seat on the valve. that'll allow you to get into the corners of the Comb. chamber. that tool with the silver shaft and blue sanding that on the end. is for polishing. called a cross buff I think. not sure. anyways, great for polishing the chamber. again, dont polish the intake ports.

also note the regulator I use on my grinders. there cheap but work very well.

 

Get Vizard's book and don't be too ambitious on your first attempt.

Rich

 

Like I said I plan to play with a pair of iron heads for my wagon, BUT I have no less than 4 pair of those laying around and they are basically valueless so no risk.

 

Porting iron is like 10x more time consuming than aluminum. Get a set of junk Al heads to practice on.

Rich

 

yeah iron heads arent the same as porting alum. you gotta be a little more careful cause the material comes out alot easier. plus, the iron heads have much better ports to start with. not at all the amount of metal to take out. but, still you'll get the idea. my iron caprice heads were the 3rd pair I ported. lol.

 

I was going to try but I chickened out and left it to the pro's. It's not something I would be willing to mess around with on a pair of LT1 heads. They're too expensive, and I didn't wanna screw them up.

This is a link I found a long time ago, and I think it has some pretty good info on it.

http://www.pirate4x4.com/tech/billav...0Abrasives.pdf

 

 

I think this is what he meant not AI