Re: are jspec engines good?
2g's don't have as strong of connecting rods as 1g's do, but they have higher compression ratio pistons which are better. You can do a basic rebuild with 1g big rods machined onto 2g pistons. An advantage of this over forged internals is you don't get piston slap aka phantom knock.
The 1g rods / 2g piston set-up alone should be able to handle all the power you throw at it and then some, unless you plan on making 450+++whp on a Dyno Dynamics Dyno. However, many don't make that kind of power, so I wouldn't waste your money on fancy rods and pistons.
A 1g Intake Manifold can't be directly bolted onto a 2g head without port matching the intake ports of your 2g head to match the ports on the 1g Intake Manifold. A 1g Intake Manifold has bigger ports than the 2g Intake Manifold, hence the reason it's better because it breathes better.
I've never had a 7 bolt or 2g but I believe you can directly swap a 1g head onto a 2g 7 bolt, but I'm not 100% on that. While you are doing that you can swap out the cams for some after market HKS 272's and you should be ready to rock and roll. While you are in there it wouldn't hurt to replace or upgrade your valves, valve guides, retainers and springs. Although that is not needed to run HKS 272 cams. A Fel-Pro PermaTorque or OEM Mitsubishi head gasket are the way to go with some ARP head studs.
Do you have a budget and or power goals in mind?
Last edited by Forced Fed; 12-25-2009 at 07:13 PM..
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