Compression ratio of my 305?

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05-24-2014, 09:33 PM

Isaiah_13

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Compression ratio of my 305?

Sbc 305,
Bored .40
305 4 barrel h.o heads with 3 angle valve job.
280h cam.

Wondering if anybody might know what the compression ratio would be.

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05-24-2014, 11:36 PM

JKB315

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Depends on head casting number. 601 heads actually had 53cc chambers. 416 58cc

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05-25-2014, 07:53 AM

Isaiah_13

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They are 416 castings

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05-25-2014, 10:01 PM

slowbu

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What pistons are u running stock flat top ho pistons
The heads milled any
What head gaskets
Has it been decked
Etc.

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05-26-2014, 03:31 PM

Isaiah_13

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Speed pro pistons
Been decked
Just whatever size the stock head gaskets are.

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05-26-2014, 04:47 PM

slowbu

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Well
With .01 in the hole
.04 gasket
An 6 to 8cc pistons
Im getting about 9.3 to 9.5 to 1 compression

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05-26-2014, 04:51 PM

slowbu

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Alot of the 305 I've taking apart have had the shim type heads gasket
I think they are like .015 thick

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Compression ratio of my 305?

Compression ratio of my 305?

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