In the picture I put the head gasket on the intake and drew a line where it is...will it help to grind that out?

Also will it help just to knock down as much as I can on the other picture?

thanks?

 

other....I can go use my friends air and see if he had some grinding stones.....can I just waller it out as far back as I can? does it have to be REAL smooth?

 

Hellllllll ya its gonna help!!!

Be sure to match up the ports on the heads as well, it will be a bad thing if your intake ports are bigger then the intake runners on your heads. Gasket match the whole darn thing, remove as much material as possible, blend blend blend.

 

Much blending is still needed on the round ports of the intake, you need to make those transitions alot smoother.

 

Cut away! I would suggest getting some cutters instead of grinding stones though, they will plug up very fast. I cut the dividing wall out of(siamesed) mine 2.5" inches in and hogged the rest out as much as possible. Make sure it is smooth when your done. Think of where the air is going while you do it and try to reduce turbulance in its path. This is a big key in making power on a TPI, take your time and do it right.
Later,
Charlie

 

Where can I get some cutters?

 

Who does intake porting? If I remember correctly some on this board does it. I dont feel like fooling with it and will pay someone to do it for me. As long as its reasonable...


Who can do it?

 

There is about 10-12 hours work in doing one if you siamese it. I would say paying someone should cost at least $150-$200. It really is not that hard though. Search for rotary files on Ebay or go to Summit's web sight, they sell cutters. Just be carefull not to cut through on any coolant or EGR areas, the top part can be epoxied if you goof up. Make sure you get some 6" shank cutters to reach back to the center.

 

any certain shapes I should get? Can I use a drill to cut with? I dont have to siamesed the ports do I? I'll be using my stock runners, which I will try and knock down the casting marks in the tubes.....
Also I wont be doing anything to the heads, I dont want to take them off the motor. But Ive already messed with the intake so I cant turn back,now I have to complete atleast that part. Will I see a benefit from doing this on my 305? Ive got the LT1 cam in with 1.6 RR's and SLP 1.5/8 headers. Last time I drove the car was 5 months ago....the next time will be with all the goodies I mentioned above....I should see a big difference,,,,right?...........yeah I hope!

 

A drill won't spin fast enough. You need to look at getting a die grinder if you have an air compressor or you can get electric ones if not. I like the pinecone shaped ones the best. You will see a differance on your 305, but it won't be dramatically different without doing some work to the heads too. It all has to work together you know. The good thing about the 305 is it won't need as much air as a 350 so the intake can handle it's air flow needs with some port work. The siamesing of the base will give you more power because each port can share air from the adjacent runner when needed. I think your 305 probably doesn't starve for air nearly as soon as a 350 does so it wouldn't help to siamese the ports on your motor as much as it did for mine.

Also, If you don't have the heads matched to the gasket it won't help to match the intake to it. It will just cause the air to hit the edge of the head port and become turbulant.
Good luck,
Charlie

 

I worked mine over with a Dremel and flex-shaft with a high speed cutting bit. A LOT of work, but, worth it.

 

Well since Ive already grinded on the intake I gotta continue......but my question is what exactly is this going to do for me?

 

Horsepower.

You are removing material, allowing for more air. Furthermore, you are smoothing transitions so the air can flow unimpeded. It boils down using more air, and using it more efficiently.

If you aren't going to gasket match the heads, then you should at least smooth the transitions from intake to heads. That will help reduce the turbulence. If you don't, youll have air smacking into a 90 degree ridge right before entry into the heads... not good.