SBC 406 compression ratio? ???'s

dickeymoore

Dragway Regular
Mar 19, 2007
818
0
16
Atlanta,Ga.
I have a sbc 400 (bored. 30)406 with speed pro forged piston (part#L2489F) with sbc vortec heads on it now and will be swapping the 64cc vortec heads out to gm performance fastburn 62cc heads what will my compression be with the fastburn heads, block is stock deck using a. 39" headgaskets? THANKS
 

bracketchev1221

Dragway Regular
Apr 22, 2009
1,111
1
0
Mountville Pa
You also need to know piston to deck clearance for an accurate number. Zero deck to .020 in the hole can change compression by up to .75 of a number depending on bore size.
 

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