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phil400
Cochise

Canada
458 Posts

Posted - 24 Nov 2017 :  8:58:04 PM  Show Profile  Reply with Quote
What?s the max lift one could run using the stock two piece valves at 1.6 IH with stock style o-ring valve seals keepers and shields with crower 68404?s?

78T/A 4-SPEED Marty blue 400/milled 6x-4's/268H,comp roller tip rockers/ performer Q-jet/RA manifolds 2.25" exhaust with x-pipe/ mine since '99 3rd & final owner as long as I'm alive
"sometimes I do what I want to do,rest of the time I do what I have to"

tjs44
Cochise

USA
422 Posts

Posted - 25 Nov 2017 :  10:57:44 AM  Show Profile  Reply with Quote
I would not run 2 pc valves in any engine.I have a piston with the head sideways through the piston head to remind me.Street car,stock cam,driving down the road at 65 MPH.Never again.JMHO,Tom
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Blued and Painted
Chief PONTIAC

USA
3415 Posts

Posted - 25 Nov 2017 :  11:05:08 AM  Show Profile  Reply with Quote
I ran .470 lift on some factory 670 heads years ago.
I did not put it together so I don't know the retainer to guide clearance.

Putting extra stress on a 40 year old valve?
This is where some decide new aluminum heads on top a solid bottom end becomes cost effective.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.

Edited by - Blued and Painted on 25 Nov 2017 12:55:01 PM
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ta man
Two Feathers

Canada
33 Posts

Posted - 25 Nov 2017 :  11:21:49 AM  Show Profile  Reply with Quote
I ran a Crower 60919 cam with 1.65 rockers and Crower 68404's stock valves

1980 Trans Am
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phil400
Cochise

Canada
458 Posts

Posted - 25 Nov 2017 :  12:37:39 PM  Show Profile  Reply with Quote
Ok thanks, already running .454 now, but on a tight budget, a lot of the off the shelf cams have a lot of lift. Just looking at all my options.

78T/A 4-SPEED Marty blue 400/milled 6x-4's/268H,comp roller tip rockers/ performer Q-jet/RA manifolds 2.25" exhaust with x-pipe/ mine since '99 3rd & final owner as long as I'm alive
"sometimes I do what I want to do,rest of the time I do what I have to"

Edited by - phil400 on 25 Nov 2017 12:39:31 PM
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Lee
Sitting Bull

103 Posts

Posted - 26 Nov 2017 :  11:28:15 PM  Show Profile  Visit Lee's Homepage  Reply with Quote
I would not run the factory shields on any aftermarket springs. Springs expand noticeably when compressed. They expand even more when the engine is running under WOT conditions.

I've seen several Pontiacs with "performance" springs, and the shields exploded. I personally don't like having shards of steel bouncing around in my engines!

CURRENT: '73 T/A clone, boring at the moment...
67 Firebird (sold) 11.27 @ 119.6 Feb. '05 issue HPP
69 Falcon wagon, 10.51 @ 130mph Feb. '10 issue PHR (sold)
72 Cutlass Convertible, first car, owned since '82, now with a 6.0 LS, mild, putting just under 400 hp/tq to the wheels.
www.LNLPD.com
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