HG thickness = comp ratio? Help understanding

480codyGSR

New Member
And another reason I want to go thicker is because I am going to have my head machined and they say they can have to take up to 10 thousandths off. Thus making a stock .026HG .016 head to block gap and increasing my CR. So from what I understand of the take off .10 and I get a .051 making the gap .041 making my compression 9.7/1? Am I over thinking or does that sound correct?
 

480codyGSR

New Member
I don't want them to take that much off but I asked them approximately how much they will typically take off when resurfacing and they said they try to take off as little as possible but typically they take between .005 and .010 cut when resurfacing. Ive never had it done and had a question about the depth of the cut. But is that not a typical cut?
 

Screech

beer budget white trash
pick up a block for cheap off craigslist and build it.
christmas deals for little piston/ rod combos around.

oem gasket 2 layer is .030
triple layer is .040
 


Screech

beer budget white trash
you mean milled, not shaved.

You have your head resurfaced for head gasket jobs.
.040 cometic gasket, head studs, boost that dike.
or boost it stock after doing a compression test done.
if your just wanting 275 hp, your looking at around what 6-7 lbs? thats baby stuff.
 

Muckman

Not a M0derator
Typically 1-3 thousandths is a normal milling unless there is damage.
Either way, make sure the shop documents how much they remove.
Most people dont even bother milling the head unless there is a problem.
I personally would not suggest you change the compression at all.
I firmly believe you are over thinking this. You can make 300hp safely on stock internals on pump gas.
Get it tuned and you will be fine!
 

480codyGSR

New Member
Ok so if I continue with what I already had in the works with the HG and all the studs with a good tune I should make over 300? So where is the cutoff power goal before internals are pertinent?
 


Muckman

Not a M0derator
Id say 300whp is the safe max for a 100% stock block GSR long block.
Ive seen turbo GSRs daily driven at that power level for years without issues.
 
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