Compression on stock short block?

[LXSTASY]

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]

9.3:1

 

[srothfuss]

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]

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]

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]

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]

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]

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]

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]

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

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

 

[KDK1988GT]

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