[Johnny406]

Gentlemen,

Can a port matched TK II intake feed a set of 292cfm KRE D-port heads or is it choking it a bit?

[leeklm]

I was running a port matched T2 with similar heads at a consistent 10.4 qtr mile. I had some plenum work done on the T2, and now car runs 10.1,s with 325 CFM heads. The T2 likes a 1 or 2" spacer. I am selling a 4150 Victor if you do not want to use the T2.

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[65madgoat]

Will be just fine. I had 310cfm heads with that intake that was port matched.

[steve25]

When your taking in regards to choke your really talking about air speed velocity.
For the most power production while using what you have you want the head to have the minimum amount of port area in regards to the whole intake tract from the end of the runner at the junction of the plenum to the crown of the short turn.

In a ideal tract the this whole runner area in terms of length will expand at a rate of 1 to 1.5% per inch as it approaches the plenum.

This fact is in regards to a perfect straight unobstructed line of site to the valve runner, and once a curve is introduced into the picture as in the case of a common plenum 1 carb intake, this expansion rate needs to go up in percentage to compensate for the area restriction the bend ( curve ) puts into the system.

Here’s a porting tip if your going to make any changes to the manifold.
When you grind around any bend that has more then a 15 degree curve to it, raise the roof on the outside of the runners vertically.

In other words going for a trapezoid shape.

With a long enough grinding burr you can make a big radius from the plenum on into each runner which will show nice air flow gains when you test the intake manifold, but too gentle of a radius will not produce the pressure drop needed to get fuel around the lead in bend.

To feed both air and the needed fuel into each runner for the needs of a 290 cfm or better head, the roof of each runner needs to be raised up thru the roof of the as cast port .
Then use epoxy to close off that hole and form a radius / arc of .835” and then you must run atleast a 1” spacer.

Some food for thought here.
If you where running heads that let’s say where flowing 280 cfm and doing that flow number at a lift we’ll within the amount of total valve lift you where running, then your motor should be producing a easy 545 hp if your intake manifold and or carb are not the so called choke point.

If you are running 310 plus cfm heads and you are not making well over 620 Hp then you are not making full use of the money you sank into those heads and in terms of overall performance would have been better off with heads that have a lesser amount of flow, or a higher flowing intake should have been part of the head purchase.

[Skip Fix]

Not sure how tall the ports are. KRE-s 320 cfm round ports -as well as SD's need weld at the top to seal.

Steve maybe under utilizing his heads Camming and CR change the power range and total . you can use a milder cam on a better flowing head as long as it all works together. And then you have more room to cam bigger better intake if you want to go faster!

[FMile Pontiacs]

Has anyone tested a victor intake for flow and or hp it will support out of the box? I would think it could support up to a 330 flow head?

[steve25]

Skip from what I have seen the same rule of Thumb that gets 100% approval for camshafts applies to heads.

With camshafts your better performance wise to have too little then too much, and with heads in general it's the same thing , that it unless your dealing with a full on race motor that operates in a narrow 1200 power band as in a prostock motor.



A out of the box Victor will support very close to 700 hp with a 1050 Carb or bigger bolted on and both need a 2" spacer if your running anything over 440 cid and up to 7000 rpm of more.

330 Intake cfm@28" and 100% VE will make you 680 hp, yes I know there are plenty of verifiables that can swing that around, but that's just by the math.

[Skip Fix]

Skip from what I have seen the same rule of Thumb that gets 100% approval for camshafts applies to heads.

I know the math. But then we get into the similar old discussion that those BIG E heads with a 215 cc port and all that flow will make a Pontiac sluggish! Just saying a 320 cfm and for sure a 290 cfm port on a 400-462 stock block will not be doggy! Is it worth an extra $200 to have a 310-320 over a 290 cfm- I sure would.

My Torker II with a 1/4x3/8 at the rear spacer is supporting a real 550-575 hp. Once it is not 100 degrees her I have one on a 0.060 455 and a stump Puller and 320 SD heads will be on the dyno