1971 455 out of a vista cruiser any good?

shaks 442 clone · 03-05-2008, 02:22 PM

does anyone know the compression ratio of this year 455?

is it worth buying?

and i just found out my 350 isnt worth rebuilding the crank has to many deep grooves and a lot of thrust play and it needs a sleeve.

joe_padavano · 03-05-2008, 03:01 PM

Quote:

Originally Posted by shaks 442 clone

does anyone know the compression ratio of this year 455?

About 8.5:1. 1971 was the first year of reduced compression ratios to accommodate low-lead gas. The good news is that the G heads will have induction hardened valve seats.

Quote:

is it worth buying?

The last 455 Olds block was cast in 1976. ANY 455 is worth buying.

shaks 442 clone · 03-05-2008, 11:27 PM

can the compression be steped up on a 71 or newer engine by simply changing the heads and pistons?

Olds64 · 03-06-2008, 05:23 AM

Changing to the pistons without dishes will increase your compression. Summit's rebuild kit offers the pistons with reliefs that will be higher compression than any smogger engine. They are cast, but they aren't 8.5:1

joe_padavano · 03-06-2008, 06:12 AM

Quote:

Originally Posted by shaks 442 clone

can the compression be steped up on a 71 or newer engine by simply changing the heads and pistons?

All Olds big block heads have the same 80-ish CC chambers (except for the 68-69 D heads that have a designed chamber of 72 CC). Note that as-cast the chambers tend to run about 83-84 CC. The compression ratio is varied by changing the size of the dish in the pistons. The factory low-compression pistons look like soup bowls.

shaks 442 clone · 03-06-2008, 07:31 AM

so with some nice flat top pistons what compression ratio would you think i would be close to?

J-(Chicago) · 03-06-2008, 07:45 AM

To accurately calculate the static compression ratio of any engine, the following values must be known:
Bore diameter, stroke length, rod length, deck height, combustion chamber volume, cylinder head gasket compressed thickness, and cylinder head gasket bore diameter.

http://www.rbracing-rsr.com/compstaticcalc.html

66 Olznut · 03-06-2008, 08:09 AM

These are the pistons out of my 400. I've never seen flat tops on an Olds until these. I was told these are the stock pistons.

joe_padavano · 03-06-2008, 09:36 AM

Quote:

Originally Posted by 66 Olznut

These are the pistons out of my 400. I've never seen flat tops on an Olds until these. I was told these are the stock pistons.

W-31s also used flat top pistons from the factory.

88 coupe · 03-06-2008, 07:33 PM

Quote:

Originally Posted by shaks 442 clone

........ so with some nice flat top pistons ........

You need to watch whose advice you are listening to.

Quote:

Originally Posted by shaks 442 clone

........ what compression ratio would you think ........

No way to guess without knowing the piston specs, compression (pin) height in particular.

Quote:

Originally Posted by J-(Chicago)

........ Bore diameter, stroke length, rod length, deck height, combustion chamber volume, cylinder head gasket compressed thickness, and cylinder head gasket bore diameter ........

The internet is full of bogus information. You need to pay more attention to where you get your information.

Quote:

Originally Posted by J-(Chicago)

........ http://www.rbracing-rsr.com/compstaticcalc.html

Try it with the specs from your own engine.

Norm

03-05-2008, 02:22 PM	#1 (permalink)
shaks 442 clone Senior Member Join Date: Apr 2007 Location: hayward, california Posts: 227	1971 455 out of a vista cruiser any good? does anyone know the compression ratio of this year 455? is it worth buying? and i just found out my 350 isnt worth rebuilding the crank has to many deep grooves and a lot of thrust play and it needs a sleeve. __________________ my cutlass as of 08/27/2007

03-05-2008, 11:27 PM	#3 (permalink)
shaks 442 clone Senior Member Join Date: Apr 2007 Location: hayward, california Posts: 227	can the compression be steped up on a 71 or newer engine by simply changing the heads and pistons? __________________ my cutlass as of 08/27/2007

03-06-2008, 05:23 AM	#4 (permalink)
Olds64 Landyacht Club President Join Date: Jul 2007 Location: Lawton, OK Posts: 1,224	Changing to the pistons without dishes will increase your compression. Summit's rebuild kit offers the pistons with reliefs that will be higher compression than any smogger engine. They are cast, but they aren't 8.5:1 __________________ "Some men are Baptists, others Catholics. My father was an OLDSMOBILE man." Ralphie Billingsley A Christmas Story 1983 "We rei-eign, supreme, ooooh god! Burrito supreme, and a chicken supreme, and a CUTLASS SUPREME!" Tenacious D 2007

03-06-2008, 07:31 AM	#6 (permalink)
shaks 442 clone Senior Member Join Date: Apr 2007 Location: hayward, california Posts: 227	so with some nice flat top pistons what compression ratio would you think i would be close to? __________________ my cutlass as of 08/27/2007

03-06-2008, 07:45 AM	#7 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 1,514	To accurately calculate the static compression ratio of any engine, the following values must be known: Bore diameter, stroke length, rod length, deck height, combustion chamber volume, cylinder head gasket compressed thickness, and cylinder head gasket bore diameter. http://www.rbracing-rsr.com/compstaticcalc.html __________________ I'd rather have a numbers matching poker hand. Last edited by J-(Chicago) : 03-06-2008 at 07:52 AM.

03-06-2008, 08:09 AM	#8 (permalink)
66 Olznut Ca's Only Official OLZNUT Join Date: Mar 2007 Location: Canyon Country, Ca Posts: 44	These are the pistons out of my 400. I've never seen flat tops on an Olds until these. I was told these are the stock pistons. __________________ '66 442 in the body shop now. 400 short block bought on ebay for $300 at machine shop as of 2/23

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