JDM STI V7 shortblock VS JDM STI V7 Spec C shortblock

Lam · 02-15-2008, 05:37 PM

Hi, does anybody know whats the difference between the normal JDM STI V7 shortblock and the V7 Spec C shortblock? are they identical or spec C is better in some ways? how can i tell if i have a Spec C block?

thanks for any inputs

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hellafastwrx · 02-15-2008, 05:57 PM

the shortblocks are the same I believe.... spec c has better flowing heads

adbramsay · 02-15-2008, 08:49 PM

rumors have abounded that the spec c crank has been nitrated(cold treated to make itr stronger)

lukeskywrx · 02-16-2008, 01:06 AM

to my knowledge they are almost the same, but as you mentioned there might be a slight post processing to some of the internal parts such as nitriding.

I think the V7 Spec C has the same intake manifold as the V8 with no TGV parts.

If all you are dealing with is the shortblock the standard V7 will take a hell of alot of power, more than most people will ever push through it. Even on broken subies in the US I bet a broken crank is pretty rare, usually its pistons or rods that break.

GTScoob · 02-16-2008, 02:56 AM

V7 Spec C is essentially the same as a ver8 motor except with no twin-scroll system and with forged pistons instead of the hypercast ones they put in ver8s and newer. Same heads and cams as a ver8.

Hyper · 02-16-2008, 04:26 AM

Quote:

Originally Posted by hellafastwrx

the shortblocks are the same I believe.... spec c has better flowing heads

yep
+ cams, ecu tune

02-15-2008, 05:37 PM	#1
Lam Scooby Newbie Member#: 35133 Join Date: Apr 2003 Location: Toronto	JDM STI V7 shortblock VS JDM STI V7 Spec C shortblock Hi, does anybody know whats the difference between the normal JDM STI V7 shortblock and the V7 Spec C shortblock? are they identical or spec C is better in some ways? how can i tell if i have a Spec C block? thanks for any inputs * Registered users of the site do not see these ads.

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02-15-2008, 05:57 PM	#2
hellafastwrx Scooby Newbie Member#: 68059 Join Date: Aug 2004 Chapter/Region: Tri-State Location: Long Island Vehicle: 2011 DGM WRX Hatch 304whp 04 wagon - sold	the shortblocks are the same I believe.... spec c has better flowing heads

02-15-2008, 08:49 PM	#3
adbramsay Scooby Newbie Member#: 152345 Join Date: Jun 2007 Location: The Bahamas Vehicle: 2000 R34 GTS-T sedan silver	rumors have abounded that the spec c crank has been nitrated(cold treated to make itr stronger)

02-16-2008, 01:06 AM	#4
lukeskywrx Scooby Specialist Member#: 59837 Join Date: Apr 2004 Chapter/Region: SWIC Location: Nor Cal Vehicle: 2004 Spec-C Type RA What MAF? -Speed Density!	to my knowledge they are almost the same, but as you mentioned there might be a slight post processing to some of the internal parts such as nitriding. I think the V7 Spec C has the same intake manifold as the V8 with no TGV parts. If all you are dealing with is the shortblock the standard V7 will take a hell of alot of power, more than most people will ever push through it. Even on broken subies in the US I bet a broken crank is pretty rare, usually its pistons or rods that break.

02-16-2008, 02:56 AM	#5
GTScoob Scooby Specialist Member#: 68602 Join Date: Aug 2004 Location: Atlanta Vehicle: 02 STi Wagon	V7 Spec C is essentially the same as a ver8 motor except with no twin-scroll system and with forged pistons instead of the hypercast ones they put in ver8s and newer. Same heads and cams as a ver8.