327 Build - Team Camaro Tech
Engine General Engine Discussion.

 
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post #1 of 6 (permalink) Old Apr 5th, 08, 10:52 PM Thread Starter
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327 Build

I have a 327 that I will be putting a set of Vortec heads on. The heads have been machined for .550 lift. They have Z28 springs, and screw in studs. With my flat top pistons I think my CR will be around 10:1. The intake will be the Vortec matching Air Gap. The car is a 69 Camaro with M20 transmission. The rear end has 3:08 gears but I will be upgrading to 3:73's soon.

I need suggestions for a cam.

I appreciate your help.
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post #2 of 6 (permalink) Old Apr 6th, 08, 12:09 AM
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Ron
 
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Re: 327 Build

Quote:
The heads have been machined for .550 lift.
I imagine you had the guides lowered. If you installed new valves, I would have gone to a .100 taller valve; anyway, I guess the combustion chamber is approx 64cc's with Flat tops pending piston to deck height between .025" and .015" with a .019" shim gasket and 4.030" bore your compression would be between 10.25 and 10.5. I would choose a Mechanical Tappet or Roller 108 LSA cam with approx a .530 to .540" lift looking at a duration that would give approx an 8.1:1 DCR with cam installed straight up to reflect todays Octane.

NOTE: The .019" shim gasket should give you a respectable quench. A Holley 750DP on an Edlelbrock RPM Air Gap with 3.73 gears should get you above 7000rpm and well over 400Hp.

Remember to use the Cam Manufacturers recommended Valve springs. What is the diameter of your valve spring pockets? You will more then likely be using dual springs or possibly beehives if you can not get the pocket to say a 1.439in diameter.

I've a 68 327 + 030" forged crank and rods with TRW dome pistons engine running 2.02/1.6 Manleys in a set of Grumpy Ported Fuelies, 750Dp and Edelbrock RPM. My Static compression is approx 11.25:1 and I run a Mechanical Flat Tappet 108 LSA, .563in lift with 296 int / 302 ext advertised installed at 106 degrees giving me approx an 8.23 DCR. Needless to say the engine is not Octane friendly by todays standards; however, my mouse can buzz 8 grand with shaft mounted rockers. I estimate a conservative 425Hp.

Picture a 302 with that DCR ))

Try Patrick Kelleys DCR Calculator when selecting Camshafts:http://www.empirenet.com/pkelley2/DynamicCR.html

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Last edited by Z15CAM; Apr 6th, 08 at 01:13 AM.
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post #3 of 6 (permalink) Old Apr 6th, 08, 02:04 AM
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Re: 327 Build

Quote:
Originally Posted by Z15CAM View Post
I guess the combustion chamber is approx 64cc's with Flat tops pending piston to deck height between .025" and .015" with a .019" shim gasket and 4.030" bore your compression would be between 10.25 and 10.5.
Sounds like a high estimate for a 3.25 stroke crank. Maybe 9.7 to 10.0 with a 5cc flat top.

What type of cam are you looking for? Solid roller, hydraulic roller, solid flat tappet or hydraulic flat tappet?
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post #4 of 6 (permalink) Old Apr 6th, 08, 02:55 AM
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Ron
 
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Re: 327 Build

AH! you're right I forgot to account for the 5cc Valve reliefs in the Piston. The Static Compression would be more like 9.8:1.

Looking at say a .530 max lift with a 274/280 advertised and 108 LSA with 104 ICL I get around an 8.01 DCR. That's not to shabby. You might get more torque from a 270/276 110 LSA, ICL 104 but could be pushing the envelope on todays pump gas with an 8.13 DCR.

4 Spds like the 108 LSA for Drag but I actually prefer a 112 LSA for the HWY and Winter driving in Northern Ontario as it has a flatter torque curve. The 108 LSA tends to push the torque curve upwards and keep the engine buzzy at shift points which I believe the 327 would like for the strip.

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Last edited by Z15CAM; Apr 6th, 08 at 12:49 PM.
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post #5 of 6 (permalink) Old Apr 6th, 08, 11:32 AM Thread Starter
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Re: 327 Build

Quote:
Originally Posted by onovakind67 View Post
Sounds like a high estimate for a 3.25 stroke crank. Maybe 9.7 to 10.0 with a 5cc flat top.

What type of cam are you looking for? Solid roller, hydraulic roller, solid flat tappet or hydraulic flat tappet?
Well I would like a roller but the budget says solid or hydraulic flat tappet.
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post #6 of 6 (permalink) Old Apr 6th, 08, 12:47 PM
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Ron
 
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Re: 327 Build

I would go Solid Flat tappet for 327 as it will give you that extra 500+rpm on the top end. Consider these profiles from Comp Cams - of course other Cam Mfgr's have similar profiles: XS274S or the XE274S-10 with the 4/7 swap. Comp Cams CamQuest simulator also recommends the 282S but I like the slightly higher lift and longer Exhaust duration of the other 2 cams.

I think a 650Dp would be a good Carb choice for your application.

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Last edited by Z15CAM; Apr 6th, 08 at 01:54 PM.
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