I'm most likely gonna buy the 350 HO crate engine. currently i have a LG4 with 143000 miles on it. runs great, im just ready for more power. what else is needed? could i use the same computer, intake, carb? im planning on purchasing the one that is not complete. im a student on a limited budget.

 

If you're talking about the 330 hp version, it has Vortec heads, so you'll need a Vortec intake. Reports vary as to whether they have the exhaust crossover passage, so EGR could be an issue.

You didn't say what year your car is, but the 350 will be one-piece rear main seal, meaning a new flex plate is in order. You'll also need a 350 knock sensor and module, and harmonic balancer.

You ought to help that 350 breathe, so a high flow exhaust system from heads to bumper should be considered a must.

Other than that, your carb will work, just rerod/hanger the secondaries. An aftermarket chip would enhance the advance curve, but that isn't a must. Figure on filling the tank with high octane unleaded.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.73 unlimited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LB9 w/ZZ3 cam, TBD heads, exhaust, paint, etc.).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & shift kit, 3.08 10-bolt, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.

 

BTW its an 85 Z28

 

and its a 5spd

 

I'm considering the same change on my '85 Z w/ the LG4. Check out the responses on motor swap page, 305 to new 305 subject. I got a lot of questions answered there. Gm also offers 250 hp/ 304ft.lb , 350 that accepts most of our 305 equipment. FYI . Good luck!

 

well there is that 350 Ho kit from GMPP not sure what the part #s or price is but it has everything to change the 305lg4 over to the 350 Ho

 

The part # for the 350 HO conversion kit is 10185077. You have to start with a carbureted automatic car from '82-87. Since pyro has an '85 5-speed, he's eliminated for an emissions-legal conversion. But, does anyone look in MI?

The kit runs about $4300 plus tax & shipping. A student on a limited budget probably isn't going to be able to handle that.

The crate motor rusty mentioned is probably the better bet overall. Less $'s, has EGR passages, runs on regular unleaded, etc. Believe it is also two-piece rear main, but if not, flex plate is only about $50.