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next 2295 question... how much lift #1625108
05/26/14 02:46 AM
05/26/14 02:46 AM
Joined: Dec 2012
Posts: 50
Australia
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big_wedge Offline OP
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big_wedge  Offline OP
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Australia
I have read that 2295 pistons need a fly cut on the edge of the valve releif, at what valve lift is this required?

Re: next 2295 question... how much lift [Re: big_wedge] #1625109
05/26/14 03:59 AM
05/26/14 03:59 AM
Joined: Aug 2003
Posts: 43,200
Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
Quote:

I have read that 2295 pistons need a fly cut on the edge of the valve releif, at what valve lift is this required?


It really depends on the cam lobes and lobe seperation angles, there is probally not a certain valve lift for every cam that you need to cut the pistons more for valve to piston clearances I've seen some of the Mopar brand camshaft BB grinds not fit well with those pistons where a bigger solid roller race cam(different brands) fit better Plan on checking any aftermarket race or big street and strip cam for valve to piston clearances The opening rates on the cam lobes determine when and if the pistons will come close to the valves in the overlap cycles


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: next 2295 question... how much lift [Re: big_wedge] #1625110
05/26/14 04:10 AM
05/26/14 04:10 AM
Joined: Aug 2004
Posts: 214
Hamburg / Germany
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Den300 Offline
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Hamburg / Germany
When I am back home from work I can send you my cam specs.
I am running these pistons with a solid roller with .580 lift.
No problems. The pistons already have a valve relief.


Hamburg/Germany

69 Chrysler 300
446cui Dual Quad
12.64 @ 110.7

Re: next 2295 question... how much lift [Re: Cab_Burge] #1625111
05/26/14 04:14 AM
05/26/14 04:14 AM
Joined: May 2011
Posts: 625
Oakville, Wa
HOTMOPR Offline
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Oakville, Wa
I have 2295f in my street car along with a set of big valve 906 heads. I run a 292@.050 with.635" lift and a 110* lsa solid crower cam with no issues.


67 Barracuda, 470" B, Glide, FuelTech FT600, Precision, Ptc, QA1, Calvert, Smith racecraft, Afco, Dana 60. 275 radials
Re: next 2295 question... how much lift [Re: big_wedge] #1625112
05/26/14 04:48 AM
05/26/14 04:48 AM
Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar Offline
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Aurora, Colorado
It's the cam duration, LSA (overlap), and installed centerline, not advertised lift that matters because the valves are closest to hitting the piston in the overlap period, just before and after TDC.

I don't know which pistons those are, but I would check the thickness of the piston at the valve notch.

I was thinking of cutting the valve notches deeper in my KB ICON pistons, but the piston is only about 0.210" thick at the valve notch already.

Re: next 2295 question... how much lift [Re: 451Mopar] #1625113
05/26/14 07:06 AM
05/26/14 07:06 AM
Joined: Dec 2012
Posts: 50
Australia
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big_wedge Offline OP
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omg i am not running anywhere near as much cam as you guys on this build. I have a .509" purple with 1.6 rockers .543" in total. i guess I should just stop over thinking things and run it

Re: next 2295 question... how much lift [Re: big_wedge] #1625114
05/26/14 08:55 AM
05/26/14 08:55 AM
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing Offline
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Eighty Four, PA
Many factors come into play for piston to valve clearence.
Valve size
cam lift
Cam advance advance or retard
block deck height
piston height
If you have all your assembly information you can figure the clearence needed.

Re: next 2295 question... how much lift [Re: big_wedge] #1625115
05/26/14 11:14 AM
05/26/14 11:14 AM
Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
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MRMOPAR622 Offline
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Quote:

omg i am not running anywhere near as much cam as you guys on this build. I have a .509" purple with 1.6 rockers .543" in total. i guess I should just stop over thinking things and run it




With a .543 you have plenty of room.I used to run these pistons(lighten)and the Speed Pro exact specs.Just make sure you have good rod bolts.


"To Be The Man'You Have Got To Beat The Man" "T/D and Pro-Bracket Racer"
Re: next 2295 question... how much lift [Re: MRMOPAR622] #1625116
05/26/14 01:14 PM
05/26/14 01:14 PM
Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
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cudadoug Offline
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Between a rock & a hard place
Quote:

With a .543 you have plenty of room.I used to run these pistons(lighten)and the Speed Pro exact specs.Just make sure you have good rod bolts.




Guess that's how yall roll down in 'Bama?

OP take what was already stated above to the bank and CHECK IT YOURSELF. It's very easy to do.

It's the cam duration, LSA (overlap), and installed centerline, NOT ADVERTISED VALVE LIFT that matters because the valves are closest to hitting the piston in the overlap period, just before and after TDC.

Cab is also correct, opening rate is also a critical factor.

Other factors in which no two motors are alike: Deck height, chamber cc, head gasket choice, valve diameter. CHECK IT YOURSELF...

Re: next 2295 question... how much lift [Re: cudadoug] #1625117
05/26/14 06:01 PM
05/26/14 06:01 PM
Joined: Aug 2004
Posts: 214
Hamburg / Germany
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Den300 Offline
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ran the pistons with both cams, no prblems.


Hamburg/Germany

69 Chrysler 300
446cui Dual Quad
12.64 @ 110.7

Re: next 2295 question... how much lift [Re: cudadoug] #1625118
05/27/14 06:46 AM
05/27/14 06:46 AM
Joined: Dec 2012
Posts: 50
Australia
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big_wedge Offline OP
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Australia
I know to CHECK IT MYSELF and I know how to, but i thought maybe there was a valve lift rule of thumb with these pistons like the valve steams on iron heads.







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