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First time porting heads

20K views 62 replies 10 participants last post by  Camaro_Nut2001 
#1 ·
Well, I finally got the courage to start porting on my "062" Vortecs. I'm gonna fully port the exhausts and just barely clean up the intake ports along with gasket matching the intake and heads. I'm cutting the guides and seats, pulling the pressed in studs, tapping and installing shoulderless screw studs (gonna run self-aligning rockers so I don't have to cut the stud boss) and hope for the best. I think I am done with the carbide cutters on the first head and ready to do the final finish on the exhaust ports with cartridge rolls. Here are a few pictures. Please let me know if you think I'm headed in the right direction, completely off base or just plain ruined this head already. If I haven't ruined the head, please give me your advise on how i'm doing and any tips you have. Thanks, Ted.
http://www.hotrodders.com/forum/attachment.php?attachmentid=70253&stc=1&d=1357179111
http://www.hotrodders.com/forum/attachment.php?attachmentid=70254&stc=1&d=1357179111
http://www.hotrodders.com/forum/attachment.php?attachmentid=70255&stc=1&d=1357179111
http://www.hotrodders.com/forum/attachment.php?attachmentid=70256&stc=1&d=1357179111
http://www.hotrodders.com/forum/attachment.php?attachmentid=70257&stc=1&d=1357179111
 

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#42 · (Edited)
I used this website's calculator. United Engine & Machine Co. Incorporated Cylinder Head Volume: 64cc Piston Head Volume: 6 Gasket Thickness: .015 Gasket Bore: 4.100 Cylinder Bore: 4.030 Deck Clearance: .026 Stroke: 3.4800 Rod Length: 5.7 Intake Valve Closing: 63 (DO NOT ADD 15) (Use valve timing @ 6*) Here is an easy formula to get intake valve closing point. Advertised intake duration / 2 = ?, ? + LSA = sum, Sum - (LSA - ICL) = ?, ? - 180* = Intake closing point 272 / 2 = 136, 136 + 112 = 248, 248 - (112 - 107) = 243, 243 - 180* = 63
 
#51 ·
I am very sure by a reliable source the Vortec heads rough surface plays a role in the performance of the heads by suspending the A/F mixture.That you can benefit from porting the exhaust side,but not to alter the intake runner.That if you smooth port the intake runner,what your left with is just another set of OEM castings.
It is one of those deals that is a summary in your knowledge base you have learned along the way.
 
#57 ·
1gary. Im glad you share your knowledge with us.
I know that all members dont always agree or only partially agree,but I dont see the need for attacks.
Like you I offer my all be it limited,experiences. I enjoy learning at the same time.

I will try to be less blunt in the future,or take problems to private messages. I would like to see a few different engines and combinations in the future
 
#59 ·
Porting them well will take them to about 190cc's and 250-260cfm with a 1.94" valve. And if you have a 350 that is approaching 6,000 RPM (very common for most hot street builds) that can equate to some major power.

The vortec heads were a design improvement but they were also truck heads that were produced as cost effectively as possible. Which leaves a LOT of room for improvement on a hot street build.
 
#63 ·
I finished porting the second head last night. I've got to cut the guides down, clean it, lap the valves in, clean it again and put it together. Plan on being ready to put em on and do my clearance checks, pushrod length etc... on Tuesday. Then its time to get the lil "Iron Duke" and 5-speed out and start getting everything ready for the swap. I have made my decision on the trans bolt access idea. Instead of cutting holes to get to the top bolts, thats what I did on my last S10 build, i'm gonna cut a section out of the floor pan, mig four small strips of 16ga. to the underside, lay a small bead of silicone on the strips and lay the piece I cut out right back in place after I get the motor and trans in. This way, if I ever have to pull the trans I can just pull the carpet, sound and heat dampner, floor plate up and have super easy access to the trans bolts :D. I've still got lots of playing to do but im gettin excited about seein what this lil flat top motor runs like.
 
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