Compression help !

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Compression help !

Post  ctdck on April 20th 2017, 8:47 pm

I Have 1986 460 out of a motor home stock bore, crank, rods and pistons, I pulled the d3ve heads off and put c8ve-e heads on. The heads have cobra jet size valves 2.250 intake 1.760 exhaust , they been milled 0.10 thousandths I put stock fel-pro head gaskets on I think there 41 thousands compressed . Just kind of wondering around what my compression might be?

Thanks for any help!!!


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Re: Compression help !

Post  rmcomprandy on April 20th 2017, 9:44 pm

ctdck wrote:I Have 1986 460 out of a motor home stock bore, crank, rods and pistons, I pulled the d3ve heads off and put c8ve-e heads on. The heads have cobra jet size valves 2.250 intake 1.760 exhaust , they been milled 0.10 thousandths I put stock fel-pro head gaskets on I think there 41 thousands compressed . Just kind of wondering around what my compression might be?
 Thanks for any help!!!

Probably around 8 to 1.

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Re: Compression help !

Post  Mark Miller on April 20th 2017, 10:19 pm

rmcomprandy wrote:
ctdck wrote:I Have 1986 460 out of a motor home stock bore, crank, rods and pistons, I pulled the d3ve heads off and put c8ve-e heads on. The heads have cobra jet size valves 2.250 intake 1.760 exhaust , they been milled 0.10 thousandths I put stock fel-pro head gaskets on I think there 41 thousands compressed . Just kind of wondering around what my compression might be?
            Thanks for any help!!!

Probably around 8 to 1.

Wouldn't have been around 8 to 1 with the D3VE Heads?

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Re: Compression help !

Post  BBFTorino on April 20th 2017, 11:34 pm

Probably about 9.2:1

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Re: Compression help !

Post  dfree383 on April 21st 2017, 7:10 am

In the 9-9.5 range depending on head actual CC.

Bet on closer to 9
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Re: Compression help !

Post  rmcomprandy on April 21st 2017, 9:03 am

I misread -- I was reading D8VE heads like some marine engines had.

"86 motorhome short block = 22 cc oblong dish pistons about .040" down the bore; (about 10 cc).

11.5 cc head gasket

about 76 cc combustion chamber head

942 cc cylinder

The math says about 8.9/1 ...

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Thank you

Post  ctdck on April 21st 2017, 3:55 pm

Thanks all of you for the help

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