6 and 7 bolt

[MEz]

Hey guys I'm thinking about buying a 97 gsx that spun a bearing for 1k. Was wondering if it was a good idea to upgrade:

Keep 7 bolt block and rebuild with evo internals, evo crankshaft, evo pistons, evo rods, evo ect.

Swap the 7-bolt head for a 6-bolt head off a 1g 93 because of the bigger ports

Tell me what you guys think.

 

[brian9397gsx]

Rebuild it, keep the 2g head as its smaller ports and valve angle allow it to outflow 1g heads.

 

[wraithGSX]

2g heads make more power,and spool faster. The 95-97 blocks crankwalk,so if you want to keep the factory 2g cam and crank sensors,find yourself a 98-99 3 piece thrust washer block. If you want,you can use a 1g block,either 6 or 7 bolt,but there are a few things you have to contend with in doing that.

 

[ed1380]

Do a 6 bolt swap but keep the 2g head. Keep the stock internals. They're reliable for 450hp. The lower cr will also allow more boost with less knock

 

[bryanwheat]

Do a 6 bolt swap but keep the 2g head. Keep the stock internals. They're reliable for 450hp. The lower cr will also allow more boost with less knock

This is how i prefer to do it, 6 bolt bottom end, and run the 2g head so that you can keep the 2g thermostat housing, water pipe, and radiator hoses. You can also keep the 2g intake and ignition component mounting. It turns out way cleaner this way, and you won't have to cut the counter weight from the shift linkage to clear the radiator hose.

 

[SexyDSM95]

This is how i prefer to do it, 6 bolt bottom end, and run the 2g head so that you can keep the 2g thermostat housing, water pipe, and radiator hoses. You can also keep the 2g intake and ignition component mounting. It turns out way cleaner this way, and you won't have to cut the counter weight from the shift linkage to clear the radiator hose.

I have this setup but went with a 1g NT water pipe and lower thermostat housing. I was sick of the leaks when the hoses for the block off would rot. I use a 1g lower rad hose and do not have clearance issues with the counter weight or shifter linkage.

And for everyone who has said to use the 7-bolt head, also forgot to mention that you will need to drill the head to accommodate the 6-bolt head studs. IIRC, they are 1mm larger?

 

[MEz]

Should of added that I'm also thinking about upgrading the manifolds, throttle body, bov, piping, turbo, fuel pump, fuel injectors, belts and possibly the gears, rockers, valves, and springs. Thats why I was wondering a 6-bolt head was appropriate swap because of the larger ports

 

[Dsmj89]

How much power are you going for ? First set yourself a goal before going out and spending money.

 

[brian9397gsx]

Either way you go 6 or 7 bolt bottom end keep the 2g head. Both my cars are 6bolt bottom ends with 7bolt heads.
My 93 has gsc cams manley springs the port size will not hold you back

 

[MEz]

How much power are you going for ? First set yourself a goal before going out and spending money.

Planning to buy off of parting outs and trying to spend less than 2k on mods.

Either way you go 6 or 7 bolt bottom end keep the 2g head. Both my cars are 6bolt bottom ends with 7bolt heads.
My 93 has gsc cams manley springs the port size will not hold you back

Do you suggest me to upgrade to evo internals since there is a spun bearing? I know btw that i will have to shave parts of the walls because the evo crank is a little bigger than the 2g crank. I'm planning to take her hopefully 400+ horses

 

[brian9397gsx]

I would go that route if you can get by cheap. Weigh the costs first.

 

[SexyDSM95]

x2 as mentioned stock block is reliable for 450 I have seen a few people also hit over 500 and be fine. But cost can be a driving factor for sure. So just make sure you are putting it in the right places and building smartly.

 

[MEz]

Thanks for your input guys. The the first thing I plan to do after I buy the car is replace the internals with evo internals for reliability and keep the 7-bolt head and block