[Stan Weiss]

Originally Posted by ponyakr

Got a pdf copy of the 2014 NHRA rule book.

Here's what it says about driver weight.

"...Class is determined without
driver weight. Once classification weight is calculated, 170 pounds
will be added for driver to arrive at minimum weight..."

Here's the head rule.

"...CYLINDER HEADS
Must be correct casting number for year and horsepower
claimed, per NHRA Technical Bulletins or NHRA-accepted.
Cylinder-head casting must also be on NHRA runner volume list
as published on NHRARacer.com. Porting, polishing, welding,
epoxying, and acid-porting permitted. Grinding and polishing in
combustion chamber permitted. Welding and/or applying epoxy
in combustion chamber prohibited. Spark-plug hole must
maintain the stock location, size, and angle as machined by the
OEM; spark-plug adapters prohibited.Valve-guide centerlines
must maintain the stock lateral and front-to-back location as
machined by the OEM.Valves must maintain stock angle; valvestem angle must remain stock, +/- 1 degree. Cylinder head must
be able to hold combustion chamber, intake and exhaust runner
volumes per NHRA Specifications. Any aftermarket steel valve
permitted; must maintain stock head and stem size; titanium
valves prohibited. (OEM sodium-filled valve may be replaced with
titanium, provided weight is equal to or greater than original.)
Valve diameter permitted to be +.005-inch or -.015-inch from
published NHRA Technical Bulletins. External modifications
prohibited, intake side of head may not be cut into any part of
valve-cover bolt holes (except for SS/AH).Valve-cover bolt holes
must remain unaltered and in their original location. Welding or
epoxying permitted on external portion of runners for repair only,
maximum 2 runners per head. Heat riser passages may be
blocked off from intake-manifold side of cylinder head or in
exhaust port. The following are permitted: polylocks, jam nuts,
screw-in or pinned studs. Any valve job accepted. Exhaust plate
permitted between header and cylinder head, maximum 1/2-inch;
may not protrude into exhaust port. Cylinder head may have all
seats replaced..."

Originally Posted by ponyakr

"...Porting, polishing, welding,
epoxying, and acid-porting permitted. Grinding and polishing in
combustion chamber permitted..."


Well, if I understand the English language, that means any type of hand or machine porting is OK.

To me, that means that the CNC porting that some Pontiac shops do is SS legal. Also, I suppose that most any hand porting that increases flow is legal.

Is that the way ya'll interpret the rule ?

So, I think I've read of lots of guys/shops that can port iron heads to flow at least 240cfm or more.

To me, that means that low buck Pontiac SS engine builds can use home or shop ported heads, which will provide enuff flow to make needed power to run the index.

Just curious. For you guys who hand port iron heads. What would you charge for porting some iron heads for a SS build ?

Let me also ask this question. For those who don't port their own heads, but have paid to have a set ported, recently, what did the porting cost ? Were they flowed ? If so, what was the cfm ?

We know the retail price STARTS @ around $2000, for complete porting & valve job.

http://www.sdperformance.com/viewPro...?productID=583

https://butlerperformance.com/i-2445...tegory:1234782

But, I don't know how long a guy would have to wait, for Butler or SD to get around to their stuff.

So, who can do this work, AND actually do it within a reasonable amount of time ? Paul K ? Who else ? Time to name names, if you know any.

http://www.nitemareperformance.com/cylinderheads.html

https://www.hotrod.com/articles/hrdp...pontiac-heads/

Based on what I highlighted in your first post most of those ported heads would be illegal and the few that were not illegal would be down on the needed flow. There is a good reason that SS heads cost so much money. We can start with all of the furnace brazing that must be done to an Iron head before it is then ported.

Stan