compression ? - Team Camaro Tech
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post #1 of 12 (permalink) Old Jul 22nd, 14, 10:52 AM Thread Starter
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joe
 
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compression ?

396 with the 325hp and has edelbrock 454R-head part 6055 along with cam,intake, and holly carb. What is the comp. In the motor and what should each cylinder comp. Be around when I do a test. Also where should my timing be and how much HP. Should it make. Thanks
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post #2 of 12 (permalink) Old Jul 22nd, 14, 11:41 AM
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kevin
 
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Re: compression ?

1967-68 chiltons manual lists the compression @ 160 psi @ 10:25:1
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post #3 of 12 (permalink) Old Jul 22nd, 14, 12:06 PM
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Re: compression ?

Do you mean the Edelbrock Performer RPM 60555 head? If so that has a 118 cc combustion chamber and 315 cc intake runner.

Do you have stock pistons in the 396? Standard bore?

68 Camaro SS 396 - 468 BBC now, M21, 12 bolt 3.73 coded housing but w/ 3.31 gears.
Looking for 68 Camaro with body number NOR 181016
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post #4 of 12 (permalink) Old Jul 22nd, 14, 12:45 PM Thread Starter
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Re: compression ?

Quote:
Originally Posted by bcm66 View Post
Do you mean the Edelbrock Performer RPM 60555 head? If so that has a 118 cc combustion chamber and 315 cc intake runner.

Do you have stock pistons in the 396? Standard bore?


Yes the 6055 kit stock pistons and bore
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post #5 of 12 (permalink) Old Jul 22nd, 14, 01:37 PM
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Mike
 
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Re: compression ?

Joe,
I'm going to guess your compression is around 8.18 to 1 with a Felpro .031 head gasket...With a steel shim gasket .020 would give you around 8.33 to 1...

Bore: 4.094
Stroke: 3.76
Cylinder head Volume: 118 (This is hurting your compression)
Effective Dome Volume: -17 (ball park for the 10.25 pistons)
Head Gasket thickness: .031 for Felpro (steel gasket would be around .020)
Deck Clearance: .025 (OEM pistons)

Mike
U.S Air Force Retired
68 RS/SS, 396 BBC .060 over, M-20, 373 12 Bolt, factory color Island Teal blue, redline bias ply tires.
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post #6 of 12 (permalink) Old Jul 22nd, 14, 02:42 PM
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Michael
 
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Re: compression ?

Ought to run all day on 87 octane with that CR.
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post #7 of 12 (permalink) Old Jul 24th, 14, 10:41 AM Thread Starter
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joe
 
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Re: compression ?

Wow! That's it. So I would be wasting money on high octane additives or 93 octane
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post #8 of 12 (permalink) Old Jul 24th, 14, 11:33 AM
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Re: compression ?

yes

1967RS
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post #9 of 12 (permalink) Old Jul 24th, 14, 09:16 PM
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Anne
 
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Re: compression ?

Quote:
Originally Posted by rsssjoe View Post
396 with the 325hp and has edelbrock 454R-head part 6055 along with cam,intake, and holly carb. What is the comp. In the motor and what should each cylinder comp. Be around when I do a test. Also where should my timing be and how much HP. Should it make. Thanks
Holy Mis-Match Batman !

Just kiddin' but those huge intake ports on a 396 will result in very poor low-end torque.

Better to come here and ask for advice before buying parts.

Government's first duty is to protect the people, not run their lives.
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post #10 of 12 (permalink) Old Jul 25th, 14, 10:35 AM Thread Starter
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joe
 
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Re: compression ?

Quote:
Originally Posted by Lawrence454 View Post
Holy Mis-Match Batman !

Just kiddin' but those huge intake ports on a 396 will result in very poor low-end torque.

Better to come here and ask for advice before buying parts.
Didn't buy them came with the car. I would have asked my engine builder Joe at J&E performance in Blackwood nj. But then I would probably have gotten carried away and went all out on something radical lol.
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post #11 of 12 (permalink) Old Jul 26th, 14, 04:15 PM
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Anne
 
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Re: compression ?

Quote:
Originally Posted by rsssjoe View Post
Didn't buy them came with the car. I would have asked my engine builder Joe at J&E performance in Blackwood nj. But then I would probably have gotten carried away and went all out on something radical lol.
Those heads are worth a lot of $$$ so you can always trade or swap for whatever you need.

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post #12 of 12 (permalink) Old Jul 27th, 14, 11:23 AM
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Re: compression ?

Yep, and a set of smaller combustion chamber heads would help bump up the compression.

68 Camaro SS 396 - 468 BBC now, M21, 12 bolt 3.73 coded housing but w/ 3.31 gears.
Looking for 68 Camaro with body number NOR 181016
CRG -
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