390 Performance Expectations?

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Oct 31, 2011 | 11:40 PM

#16

dsrtjeeper

Elder User

Joined: Nov 2010

Posts: 676

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From: Glendale, AZ

Quote:

Originally Posted by RKDxpress

No. Dishes with eyebrows and 020 deck clearance. C8ae A heads mostlikly 2.02 intake 155 exhaust or size up. Comp268 cam 1:75 adj. Rockers. Similar.

Wow; your block must have been machined down quite a bit. The H304P pistons normally sit .030" down the hole. Even at .020" deck height; I doubt you have 10.5:1 CR with stock head gaskets.

Nov 1, 2011 | 07:27 AM

#17

baddad457

Hotshot

Joined: May 2003

Posts: 11,141

Likes: 25

From: south louisiana

Quote:

Originally Posted by RKDxpress

I have a simelar build at 10:5 to1 compression running 95 to97 octane. Love the performAnce not the Mpg. Sometimes I get ping with 93. Never understood how anyone could run 87 on an Fe as it never was suppose to run on it let alone etherol.

Apparently todays gas and that of the late 60's, early 70's is not quite the same as far as octane ratings go.