Compression on stock short block?

LXSTASY · May 23, 2005

What would the compression on a stock shortblock with AFR 165 58cc aluminum heads be? Stock is 9:1 with a 62.5 cc iron stock head (not 100% sure). I understand that there are different tolerances that must be measured like how the piston sits in the hole, but an educated guess or an exact one would be nice

Dan

Grn92LX · May 23, 2005

9.3:1

srothfuss · May 23, 2005

Grn92LX said:
9.3:1

My guess is 9.42:1.

Assuming that the entire engine is stock and the only think that you change are the heads.

tjm73 · May 23, 2005

9.5:1...... give or take a little. I'm not just guessing. I used some numbers I know off the top of my head to replicate a 9:1 engine with 62.5cc heads and then changed the head volume to 58cc and got 9.489:1.

Loco5.0 · May 23, 2005

While we're on the subject, anyone wanna take a stab at mine? Click link in sig for mods. My shortblock is stock also.

tjm73 · May 23, 2005

Loco5.0 said:
While we're on the subject, anyone wanna take a stab at mine? Click link in sig for mods. My shortblock is stock also.

Your's would be only slightly above stock. Trickflow TW heads are 61cc combustion chamber. Stock is between 61-63 for spec (that means anythigninthat range is considered good enough for production).

KDK1988GT · May 23, 2005

take a stab at mine if u would like

Here is one for ya...

AFR 185's 61cc
Fel-Pro gaskets
D.S.S 331 Stroker
Comp Cam 224 232 @ 555 565
.30 over

What do u all think ? Sorry for the highjack

Loco5.0 · May 23, 2005

tjm73 said:
Your's would be only slightly above stock. Trickflow TW heads are 61cc combustion chamber. Stock is between 61-63 for spec (that means anythigninthat range is considered good enough for production).

Cool, so I should be ok w/the s-trim then

tjm73 · May 23, 2005

KDK1988GT said:
Here is one for ya...

AFR 185's 61cc
Fel-Pro gaskets
D.S.S 331 Stroker
Comp Cam 224 232 @ 555 565
.30 over

What do u all think ? Sorry for the highjack

To be accurate you need to give more info. I need.....

Are you at zero deck height? If not how far above/below are you?
What's the compressed thickness of your gaskets?
Pistons - dish, flat top or dome? What's the cc displacement for the dish, valve reliefe in the flat top or dome volume?

tjm73 · May 23, 2005

You know if you want to be able to do this for yourself go here.

http://kb-silvolite.com/calc.php?action=comp

KDK1988GT · May 23, 2005

tjm73 said:
You know if you want to be able to do this for yourself go here.

http://kb-silvolite.com/calc.php?action=comp

nice link... very cool thanks man

Compression on stock short block?

LXSTASY

Grn92LX

Fidanza Man!

srothfuss

Last night I stabbed the same guy 7 times in a row

tjm73

Loco5.0

tjm73

KDK1988GT

Loco5.0

tjm73

tjm73

KDK1988GT

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Compression on stock short block?

Fidanza Man!

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