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10:1 ratio

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Old

Feb 18, 2010 | 12:43 PM

#1

hicswa

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Pro

Joined: Sep 2006

Posts: 547

Likes: 13

From: Carlstadt NJ

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10:1 ratio

Can a 10:1 ratio be achieved with a 1975 L48 engine without changing the heads.

Danny

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Old

Feb 18, 2010 | 12:53 PM

#2

Stu's81

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Joined: Nov 2009

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From: Waukesha Wi

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Change the pistons? Don't know if you could shave the heads that much.

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Old

Feb 18, 2010 | 01:03 PM

#3

MotorHead

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Joined: Apr 2000

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From: Who says "Nothing is impossible" ? I've been doing nothing for years.

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Flat top pistons and steel shim head gasket will get you close, but you still have L48 heads

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Old

Feb 18, 2010 | 02:32 PM

#4

gerry72

Safety Car

Joined: Aug 2000

Posts: 3,711

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From: San Antonio TX

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Only by a piston swap. If you were to measure everything the actual static ratio comes closer to 8:1 instead of the 8.5. You would have to angle mill the head (really not something you should consider) and deck the block using the stock parts to get close to 10:1.

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Old

Feb 18, 2010 | 02:36 PM

#5

Fast81

Melting Slicks

Joined: Aug 2003

Posts: 3,416

Likes: 291

From: dayton oh

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With iron heads you'd also risk "pinging" at that CR without CAREFUL timing adjustment and that is with hi-octane SuperUNL gas....may even need to run some Octane boost just to be safe.

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