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phil400
Crazy Horse
Canada
503 Posts |
 Posted - 24 Nov 2017 : 8:58:04 PM
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| 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.
77 T/A sold
85 Monte Carlo SS sold
83 Mustang GT sold
"Let me tell you what Melba toast is packing" |
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tjs44
Cochise
USA
452 Posts |
Posted - 25 Nov 2017 : 10:57:44 AM
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| 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
3483 Posts |
Posted - 25 Nov 2017 : 11:05:08 AM
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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.
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Edited by - Blued and Painted on 25 Nov 2017 12:55:01 PM |
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ta man
Two Feathers
Canada
42 Posts |
Posted - 25 Nov 2017 : 11:21:49 AM
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| I ran a Crower 60919 cam with 1.65 rockers and Crower 68404's stock valves |
1980 Trans Am |
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phil400
Crazy Horse
Canada
503 Posts |
Posted - 25 Nov 2017 : 12:37:39 PM
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| 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.
77 T/A sold
85 Monte Carlo SS sold
83 Mustang GT sold
"Let me tell you what Melba toast is packing" |
Edited by - phil400 on 25 Nov 2017 12:39:31 PM |
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Lee
Sitting Bull
166 Posts |
Posted - 26 Nov 2017 : 11:28:15 PM
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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, starting to get less boring!...
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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Lift
