It appears to have alot of good basic info. I'm a beginner. Will it lead me astray while home porting or should I follow it to be safe.

One thing I didn't like was his reccomendation to port straight down from the short side radius. Seems counter productive to guiding the flow???


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D.O.B. 6-9-69
My Kit builder: 401-732-4047 SD Concepts Engineering

[This message has been edited by ToddR (edited June 30, 2002).]

 

Small block chevy heads already have a TOO short short side radius. Removing too much material there will hurt flow. I just pretty much followed Nuke61's web page, DIY head porting.I did my exhaust ports a little differant than his though. He used a 1406 Felpro gasket and matched to it(but not lowering the floor too much). If I opened my port walls to that gasket, It would have made a wall where it meets the header. I looked locally for the book your talking about, but couldn't find it. Sorry if this has been no help.

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Jamie Taylor
'94 Z28 M6
Mods: BBK 52mm TB, Granetelli MAF, MSD 8.5 wires, MSD coil, Bosch +4 plugs, gutted cat., In the final stages of HOT cam kit, ported heads, CSI H20 pump, Jet Hot Hooker LT's(thanks to the GP), custom 3" Y-pipe, and Custom CAI installations. It's nice being a welder, I can do all this custom tubing stuff easy!!!
1971 Datsun 240Z with V8 power. 500+rwhp

 

Probably the best book written on the subject.

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SSMOKEM

1995 Impala SS "Cherry Bomb"
Best ETs: faster than my '65 pickup
Mods: 93% stock

My Super Impala SS Website

 

Polecat,
Amazon.com
It's only like $12 bucks or so.
What's "nukem's" web site address?

 

was the title 90's head porting?
I have read some of his other books and thought they were yery helpful.
If this is a new one I would like to buy a copy.
Kory

------------------

 

The book is copyrighted 1991 so its not really new.

The title is "How to Build and Modify Chevrolet Small-Block V-8 Cylinder Heads"

ISBN# 0-87938-547-2

That said I think its a decent book I just wish it was a little more up to date. A couple things bother me though. First, his 30degree valveseat idea is a little weird. Also his ported heads dont seem to be all that great IMO. He got ~240cfm out of a fully ported 186 casting which seems a little low IMO

Basically I think it will keep you from making the most common mistakes but dont think you'll be putting GTP out of business anytime soon either.



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Jason
93 TA, M6

 

240 cfm out of a 186 head? And that's bad?

My sportsman II's only flow 243 cfm.

Anyways, Vizard has been around awhile, and is the man when it comes to making power with stock sbc parts.

 

That's 243@ 25" vaccum.
change it to 28" and that's excellent for the heads he's workin with and the mods that had been done. Basic, very basic.

Also, It's since been shown that the 30 degree seat will greatly increase low to mid lift flow which is excellent for torque and true street power with cams in the .500-.550 lift range.



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D.O.B. 6-9-69
71 Satellite (Hers/stock)
73 Dart Swinger (Sons-7)
84 Turbo Z (rebuilding 2.2L)
71 Ply Satellite (His/Blown)
24k w/Procharger Todd's Mopar Page
My Kit builder: 401-732-4047 SD Concepts Engineering

 

That book is the one I read before home porting my heads, wound up with great flowing heads.

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Jeff Collop
<A HREF="http://collop.cz28.com" TARGET=_blank>Supercharged 95 Z28 SixSpeed
390 rwhp / 380 rwtq N/A
520 rwhp / 564 rwtq N2O
XXX rwhp / XXX rwhp BOOST
Stock Short Block</A>

------------------------

"...in our lifetime those who kill, the News World hands them stardom, and these are the ways on which I was raised, these are the ways on which I was, which I was raised; I never wanted to kill I am not naturally evil, such things I do just to make myself more attractive to you..." - Steven Patrick Morrissey

 

Whoops, I missed the 25" of vaccum part. Thanks for pointing that out, it makes me feel a little better about using his book as a guideline when I do my heads. I'm glad to hear Jeff likes it as well.



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Jason
93 TA, M6

 

Using this book and some other information out there (including Nuke61's page), I picked up about 10% more flow above 0.300" lift from my LT4 heads. Didn't get anything worth talking about at lower lifts, but I didn't expect to. Basically, I cleaned up the bowls, slimmed down the valve guides, removed the rocker stud boss, and matched the intake to the head. The stock valve job seemed damn good, so I didn't bother messing with that. I cleaned up the chambers a bit, but there wasn't much opportunity to unshroud the valves much further - once again, seems like GM did their homework here.

I don't know if I'd say that this book is the end-all of head porting info, but it's definitely a good start. Anyone that knows more about porting probably isn't talking about it If you're just looking to clean up the heads a bit, it's an excellent resource. Just don't touch the short-side radius on modern SBC heads

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1996 Impala SS - LT4 396, T56
1996 GMC K2500
1992 Buick Roadmaster Estate Wagon

 

Dulcich has written some very informative articles in CC, HR, and MM.

 

Eric, did you gain much ET with just the head job? I am going to try this, because I can't justify $500 more right now for CNC work if I take my time and do some shaping and put bigger valves in.

You guys do reccomend the larger valves, right?

How about the valve job? My machine shop will do anything I want to the valve job... is their some voodoo you would reccomend?


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-- Tim
http://tim.mindriot.net

Mods: LT1 Edit, TB Bypass, CAI, 58mm TB, GMS MAF, 160 Stat, LT4KM, !Cat, !Front Sway Bar, !Rear Sway Bar, 1LE Elbow, Meziere Water Pump, March Pulleys, Aluminum Driveshaft ('88 Z28), 3" cutout, Vigilante 3600 stall, Dynatech headers, Homemade Y-Pipe, Edelbrock "cat"-back, XE230/236 cam - click to hear!, CC 1.6RR's and guides, Nittos, MSD 6A, Accel Super Coil, Hurst LineLock, Eibach Drag Launch Springs, KYB adj struts, CE Drag Shocks, Lakewood LCA's, Biondo Mega 75 Delay Box, 3.73
<A HREF="http://www.shootmyphoto.com/misc" TARGET=_blank>
Best Times: 8.16 1/8th mile, 1.78 60', 85 MPH
</A>

 

The car hasn't made it to the track or dyno yet - I'll report back when it does.


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1996 Impala SS - LT4 396, T56
1996 GMC K2500
1992 Buick Roadmaster Estate Wagon

 

I used it before I ported my heads. Great book, and I have two sweet looking boat anchors!


Ryan