I had .021 taken off the heads and changed from a .051 head gasket to a .033 its between 11.7:1 - 12:1. I never said my car was 11.5:1. The Current car im building should be around 11.5:1.
I dont put alot of faith in dyno'ing a car. I just run it. If you want to see how slow my car is check out my youtube page. I went with a lower compression on his car so he doesnt have to run race fuel.
http://www.youtube.com/user/radd2983?feature=mhum


I simply didnt see many post out here showing the differnce between stock ported and stock. I got my method from a machine shop. The valve guide is maybe missing .2 inches from one side. Its not dished out. Plus The pictures are the rough cut on the heads. Its angled to go with the flow. My method seems to work and my heads must flow well to run as good as it does.

Thank you to those who understand what i was trying to share here. For a moment i thought i was on a import forum.

 

I'm stuck on the other side of the country via the ARMY but when I get back home to Columbus GA I have no problem having you port a set of mine on a motor I have built there. Until then keep up the good work and keep practicing.

 

Thank you, Id be happy to do them.

 

Are those holes in the roof of the ports?

 

yep

 

LOL, umm, why?

 

raised roof.

 

Yeah I got that but I didn't know you could take it that high. Apparently it doesn't hurt the flow. I assume the holes are for the rocker studs?

 

I don't see how some videos of burnouts and street racing is proving your heads are producing big power. Sorry if I'm missing something.

 

radius is cut bigger and longer on top and bottom..

 

Actually alot of racing in there. Its cool i said the videos showed how slow my car was.

 

Stock LT1 heads flow very well; removing some metal probably makes them flow better and polishing the exhaust side definitely improves flow on a modded engine. In 1995 many photos on how to do it properly for max gain were posted on this board and others ...they were very instructive and detailed with flow bench data back up. Raising the top of the intake and removing metal from the lower radii were stressed to improve flow. All this is grueling and time consuming...making them - all 16 match is tricky without the CNC and needs constant micing. The 1995 and 1996 photos also included the LT4 for comparison and showed them modded too. They are probably still available if you do a search.

 

LT1 heads may have flowed good back when the lt1 came out almost 20 years ago, but by today's standards they are horrible.

 

If you don't understand I doubt I can explain it to you, but I'll try.
Most people go to boards like this to learn how to do things correctly NOT incorrectly!
I'm all for hot rodders experimenting, and trying new things, BUT you have to be able to measure your results!! Simply making claims by posting 1/4m times, HP numbers, or burnout video's PROVES nothing!
How do you know this??? And if this is true why don't professional porters do this? Just maybe, it's because they have test results that show it's a bad idea!!
What numbers? He hasn't posted any data.
Hay, there your heads, if you want to send them to this guy, go ahead. But don't be surprised when your 400hp motor becomes a 375hp motor.

 

Get over yourself. Im not a professional. I however have done this to a few vehicles that run great at the track and on the street. The shop i took my heads to to deck them told me its fine to take a bit off the valve guide to direct air flow. They saw shaped around the valve guides and suggested i did it. they wanted a ton of money to flow bench the heads. i simply could not afford it.