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  Rocker slots are hitting the polylocks!!

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Author Topic:   Rocker slots are hitting the polylocks!!
bluestreek
Gearhead

Posts: 1460
From: Athens,GA
Registered: Jul 2001

posted 04-30-2003 09:56 PM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
I just did my 3000 mile checkup on the valve train of the TFS heads and found out that ALL!! of the lower rocker slots have been barely bumping against the polylocks at full lift.

The motor has seen the other side of 7500 rpms a few times on missed shifts and never missed a beat. The roller pattern on the valve tips are aprox. 1/16" wide and a little off center towards the outside. These billet Angus Racing rockers are supposed to be good for over .650 lift and is only .580 now.
Couldn't I go with shorter pushrods, to drop the pushrod end a little, and give a little more room for the full lift side of the slot?

------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
2nd pass: 12.11 @ 114 mph (7.80 @ 92 mph)
DanH

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steve'66
Gearhead

Posts: 7226
From: Sonoma,CA,USA
Registered: Mar 2000

posted 04-30-2003 11:15 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Blue,

Yes, get the valve train geometry centered on the valve stem and you'll be fine.

SteveW

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bluestreek
Gearhead

Posts: 1460
From: Athens,GA
Registered: Jul 2001

posted 05-01-2003 12:52 AM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
It's a good thing that they were aluminum cause it looks like the interference wore right into the bottom of the slot. I always wondered why these rockers were a little noisy for the first 200 miles!

------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
2nd pass: 12.11 @ 114 mph (7.80 @ 92 mph)
DanH

[This message has been edited by bluestreek (edited 05-01-2003).]

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steve'66
Gearhead

Posts: 7226
From: Sonoma,CA,USA
Registered: Mar 2000

posted 05-01-2003 01:33 AM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Aluminum is very forgiving.

But you still need to get the geometry right. You can try a new set of 1/16 shorter pushrods or get an adjustable p/r from comp and try a few different lengths 'til you get it perfect. Then call Alex (MM'r), he'll have them drop shipped to you asap. Real good service, I know 'cause I've been there and done that.

SteveW

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