I have a LG4 305 in my Corvette right now and was wondering what you all would suggest. Supercharge the LG4 or spend some big bucks on a new crate engine? The LG4 has 8.5:1 compression, correct? It should respond well to NOS or supercharging with that low of a CR. Just wondering what everyones opinion would be.

Matt

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I've had great success with my supercharged 305. One of the best things I enjoy most about my decision to go this route is being able to say to others at the track, "It's only a 305."

I also recognize that I'm in the minority -- that almost everyone else will go with a 350. It's actually cheaper in the long run. So your decision should be based upon what YOU want.

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Willie

Supercharged 1987 305 IROC-Z, Daily-Driver, Emissions-Legal.
Paxton (6-psig): 12.57 @ 111 mph.
Paxton (6-psig) & 50-hp nitrous: 12.04 @ 114 mph.
ATI D1SC (10-psig): ?

http://willie.camaro-firebird.org/

1987 "20th Anniversary Commemorative Edition" Z28 Convertible -- Super Chevy Show Class Winner, 1998.

 

If you're keeping the 305, make a 335 stroker. Not only will that be a torquey street engine, but you can still say it's a 305, plus I've seen balanced stroker kits for like $800 complete. Not much top-end, though. Make sure you dont detonate with cast pistons (or hyperutectics, for that matter). 1 or 2 degrees additional retard is better than a crumbled shortblock. If you get a 350 crate, get the ZZ4...best bang-for-the-buck crate engine. Just pop in your cam choice.

 

TPI then zz4 is best bang for buck. If TBI or carb I have to say vortec 350ho engine is best bang for buck (vortec heads flow better above 3000rpm than the vette heads).
I really wish GM would have come out with a zz4 bottom end (better pistons and roller cam) and vortec heads. That would be a great combo if they had the right pistons for lower compression ratio.

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, Jon (350 TBI!)
91 Red RS w/grey int, sq stereo (Alpine v12, kicker solo, MB quart premium etc)

• Holley 670 TB unit w/ 1/2" spacer/adapter
• Edelbrock RPM vortec intake
• 350ho 330hp vortec crate motor
• 8" harm. balancer
• Stewart stage 2 water pump w/160 thermo
• SLP tri-y headers to full 3"
• Rebuilt trans w/ SLP shift kit
• Centerline 16x8's all around
• 36/24 mm sway bars
• Full poly bushings, even motor mounts
• SLP LCA and panhard
• Alston SFCs
• Edelbrock 3 point STB
• Global west steering brace aka wonderbar
• Eibach pro kit springs
• Bilstien high perf. struts and shocks
• All this and I still have AC

My websiteAny questions?