[TCSGTO]

Originally Posted by ta man

It may be possible..but I'm pretty sure Dave has done enough dyno testing.I trust his judgement when he is the one porting and setting up the heads and supplying the cam.

Do you know what springs he's using? Mine have a polished, smaller diameter spring than the 99893's that have similar tension but are much lighter in weight.
Dave said he's had excellent results so far. I only have 4 dyno pulls on mine but there was no sign of valve float.

[ta man]

Originally Posted by TCSGTO

Do you know what springs he's using? Mine have a polished, smaller diameter spring than the 99893's that have similar tension but are much lighter in weight.
Dave said he's had excellent results so far. I only have 4 dyno pulls on mine but there was no sign of valve float.

I'm not sure,he did mention lighter retainers and keepers.

[Steve C.]

Some might be interested...

Exploring Rocker-arm Ratio and Cam-phase Tuning – Project Pure Poncho

http://www.hotrod.com/articles/hppp-...-phase-tuning/

Brings up the subject of less rocker ratio on the exhaust side. Keep in mind here Pontiac factory iron heads are in use. The exhaust-to-intake flow ratio of aftermarket cylinder heads might be a all different ball game.

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[Steve C.]

Somewhat related, a comment made by someone on another website....

"Some racers would run the 1.65's on the exhaust side only on a single duration cam to add a little extra to the weak side of the exhaust. But with the dual pattern cams, this isn't necessary. When you get in to really nasty stuff, the 1.65's offer an advantage when you have pushed the opening and closing ramps to their design limits. Then you can squeeze a bit more. In reality, even strongly reworked Pontiac heads have flow limits well within the 1.5's range. Also, there's going to be a small percentage of heads with after-market cams that will get by with the lesser ratio but be so close to coil bind on opening, that the larger ratio will cause problems."

Again with aftermarket heads and a higher flowing exhaust port it might be a different ballgame.


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[ponjohn]

Originally Posted by ta man

I'm not sure,he did mention lighter retainers and keepers.

Wonder if Dave would advocate using beehive springs?

[ta man]

New build is alive,just did a quick fire up..scared the dogs in the house the wife thought it was thunder!Fired up quick!Test drive tomorrow!

[AdamIsAdam]

Originally Posted by ta man

New build is alive,just did a quick fire up..scared the dogs in the house the wife thought it was thunder!Fired up quick!Test drive tomorrow!

Where is the tube from the Mopar oil separators in the valve covers going? Air pump?

[ta man]

Originally Posted by AdamIsAdam

Where is the tube from the Mopar oil separators in the valve covers going? Air pump?

Vacuum pump.