ok my friend gave me a b18b1 block with a block guard and ctr pistons i decided to do an ls/vtec and happen to grab a gsr head after i build the head and tapped it for ls/vtec now i been hearing ppl say that i can't use the head with them pistons can anyone please tell me if this is b*** or if there is any way around it like getting a thicker head gasket or what....... please help!!!!!!!

 

Compression will be TOO HIGH and you will more than guaranteed likely to have piston slap. Change the pistons or you will regret it.

 

http://www.zealautowerks.com/index.html

Hit that up and find out how unhappy it will be.

 

damn....that will give you over 14:1CR or more if the head/block was milled.

uhhh....ya you need to change out those pistons......

 

Use a different crank. or if you want the same effect use p30 pistons.

 

so what would you recomend?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by J_SHADOW &raquo;</TD></TR><TR><TD CLASS="quote">so what would you recomend?</TD></TR></TABLE>


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IntegraType-R &raquo;</TD></TR><TR><TD CLASS="quote">Use a different crank. or if you want the same effect use p30 pistons.</TD></TR></TABLE>

 

I'll help you out..
As it sits now.. 14.3 CR
GSR crank = 12.5

usdm c5 pistons = 11.9
pr3 b16 pistons = 12.2
p30 jdm b16 pistons = 12.5
p72 jdm gsr pistons = 11.4

Some might think your defeating the purpose of using a ls block.. but if your going to run those pistons, destroke or go with a p30 setup..89mm crank vs a 87mm actually makes a huge difference and people dont realize that.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TheShodan &raquo;</TD></TR><TR><TD CLASS="quote">Compression will be TOO HIGH and you will more than guaranteed likely to have piston slap. Change the pistons or you will regret it.</TD></TR></TABLE>

piston slap has to do with skirt to wall clearances, what does a high compression ratio have to do with that?

 

i would use USDM ITR pistons. a hair under 12:1cr and you can easily run 91 octane with a good tune. it would be better/safer for a daily driver.