396 Combination
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Registered User
Joined: Jun 2005
Posts: 129
396 Combination
I was just wondering what you though of my combo and if you had any suggestions weither the camshaft duration is too big or the runner size is too big.
396 LT4
Bore: 4.030
Stroke: 3.875
Pistons: SRP -5cc Flat Top
Heads: AFR 227cc Competition Ported Int: 309cfm@.700 Exh: 230cfm@.700
2.100 Intake 1.600 Exhaust Valves, 64cc Combustion Chambers
Camshaft: Solid Roller 292/292 @.006 264/264 @.050 .660/.660 110 LSA 106 ICA
Exhaust: Jet-Hot 1 3/4 Long Tube Headers Into 3" Y-pipe
SCR: 11.31
DCR: 8.46
LT4 Intake Ported with Holley Twin 58mm Throttle Body
Deck Height: 0 + Head gasket which = 0.039 Quinch
RPM: OEM Computer Limits either 7000 or 7200
I am using a HEI style distributor so I don't need to worry about the knock sensor.
396 LT4
Bore: 4.030
Stroke: 3.875
Pistons: SRP -5cc Flat Top
Heads: AFR 227cc Competition Ported Int: 309cfm@.700 Exh: 230cfm@.700
2.100 Intake 1.600 Exhaust Valves, 64cc Combustion Chambers
Camshaft: Solid Roller 292/292 @.006 264/264 @.050 .660/.660 110 LSA 106 ICA
Exhaust: Jet-Hot 1 3/4 Long Tube Headers Into 3" Y-pipe
SCR: 11.31
DCR: 8.46
LT4 Intake Ported with Holley Twin 58mm Throttle Body
Deck Height: 0 + Head gasket which = 0.039 Quinch
RPM: OEM Computer Limits either 7000 or 7200
I am using a HEI style distributor so I don't need to worry about the knock sensor.
Last edited by 95Zedder; Dec 6, 2005 at 10:49 PM.
Banned
Joined: May 2003
Posts: 6,661
From: LA (lower Alabama)
Re: 396 Combination
Heads seem fine the cam does too. I would use a split duration cam say 262-268@50 and set the lift to a little over my max flow. The last lift number that gains 10CFM or more like if your flow # are .600 283-- .700 300--.750 309 set your lift at .725 or so 'cause .700 is your last useful gain.
IMO the headers are too small and ya should have a 3-1/2" Y pipe.The Kooks steped one's are OK.
Compression is OK but ya are leaving some power on the table.
Ya are going to need springs that are 250/260 on the seat and 700/725 on the nose. After break in they will loose 15-25lbs.
IMO the headers are too small and ya should have a 3-1/2" Y pipe.The Kooks steped one's are OK.
Compression is OK but ya are leaving some power on the table.
Ya are going to need springs that are 250/260 on the seat and 700/725 on the nose. After break in they will loose 15-25lbs.
Registered User
Joined: Oct 2002
Posts: 2,931
From: Upstate NY
Re: 396 Combination
95Zedder,
What are your goals for this engine? Street driver? Drag only? What octane? Vehicle weight? Trans? Rear gear ratio? Tires?
More info helps an engine designer, or even the rest of us, choose a good combination of parts.
If I were doing a 396 LT1 for a wicked street car most of your parts would be fairly close, except for the cam and maybe the intake. I get a 7.7 DCR with your cam. That leaves a lot on the table, especially for average torque and average power on a street driven car. I'd use less cam.
My $.02
What are your goals for this engine? Street driver? Drag only? What octane? Vehicle weight? Trans? Rear gear ratio? Tires?
More info helps an engine designer, or even the rest of us, choose a good combination of parts.
If I were doing a 396 LT1 for a wicked street car most of your parts would be fairly close, except for the cam and maybe the intake. I get a 7.7 DCR with your cam. That leaves a lot on the table, especially for average torque and average power on a street driven car. I'd use less cam.
My $.02
Registered User
Joined: Jun 2000
Posts: 1,542
From: Long Island, NY ; Norfolk, VA
Re: 396 Combination
Whomever does your machine work make sure they're good at clearancing for the stroke, the shop that did mine broke through a water jacket, and i had to get my block half filled.. Which is not a bad thing.. 
... But rather do it cause i want to.. not cause i have to... fWIW your leaving a bit of power on the table as well going w/ a LT4 intake.. Since your going w/ a HEI might be beneficial to look into a Single plane style intake such as a Vic Jr. etc...
... But rather do it cause i want to.. not cause i have to... fWIW your leaving a bit of power on the table as well going w/ a LT4 intake.. Since your going w/ a HEI might be beneficial to look into a Single plane style intake such as a Vic Jr. etc...
Last edited by IllusionalTA; Dec 7, 2005 at 08:04 AM.
Banned
Joined: May 2003
Posts: 6,661
From: LA (lower Alabama)
Re: 396 Combination
Originally Posted by OldSStroker
95Zedder,
What are your goals for this engine? Street driver? Drag only? What octane? Vehicle weight? Trans? Rear gear ratio? Tires?
More info helps an engine designer, or even the rest of us, choose a good combination of parts.
If I were doing a 396 LT1 for a wicked street car most of your parts would be fairly close, except for the cam and maybe the intake. I get a 7.7 DCR with your cam. That leaves a lot on the table, especially for average torque and average power on a street driven car. I'd use less cam.
My $.02
What are your goals for this engine? Street driver? Drag only? What octane? Vehicle weight? Trans? Rear gear ratio? Tires?
More info helps an engine designer, or even the rest of us, choose a good combination of parts.
If I were doing a 396 LT1 for a wicked street car most of your parts would be fairly close, except for the cam and maybe the intake. I get a 7.7 DCR with your cam. That leaves a lot on the table, especially for average torque and average power on a street driven car. I'd use less cam.
My $.02
Just Kick the compression up to 13-1. That will git it done and no power left on the table with pump gas.
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