Alright my 310 spun a rod bearing so I'm going to pull that and build a new motor (350,383,400) I'm looking for a cheap combonation while still using the LG4 heads. If this is possible, whats a good choice for a compression ratio and cam? My car currenty has a vaccum advance dist and a single plane high rise intake w/ a holley 650 so I figure i can swap that stuff over and save some money.

Thanks,
Joe

 

if you use the 305 heads on a 350 you will have to get dished piston to keep the compression down. when you upgrade to new heads you will have to have those heads milled or buy new pistons. to save money buy some cheap 350 heads and flattops now. besides those those lg4 heads flow like popo.

 

So, If I go with a 350 and use my intake, carb, and dist. Could I use stock internals w/ higher compression pistons? and what should I look for as far as the cam goes.

 

you can use the crank and rods out of the 305 in the 350 they are the same. just buy some cheap flattop pistons. i am not sure what gear you have and tranny so i would not know about what cam. let me know and i can suggest a cam.

 

The crank and rods are the same as a 350's. But they will need to be re-balanced for the 4" bore pistons.

The LG4 heads will flow like crap, UNLESS you port them yourself (do a search for "Sitting Bull" he made a great post on how to do it yourself for cheap). You'll also need to atleast enlarge the intake valve to 1.94, and exhaust to 1.6 if you so choose.

There's an old hot rodders saying "fast, cheap, reliable. Pick two and the other it wont be."

fast and cheap wont be reliable...

also, the LG4 intake wont help you get to 400 any easier. A ZZ4 (assuming you're staying carb'd) intake is a great intake, and fairly cheap.

you'll need to do modifications to your Q-Jet to make it handle the extra cubes.

you'll need a new ignition system.

you'll need a trans that can handle 400 horses

you'll need a rear differential that can handle 400 horses

... can you see how expensive this can be?

 

I find it funny how nobody reads your entire first post. Anyways you can run flattops with 58cc heads, you just need to run a decent size cam (like an XE274). Otherwise your dynamic will be too high to run on premium.

 

The crank is not the same between a 305 and a 350. They're the same stroke, but the 350 crank has more mass on the counterweights to balance the larger pistons.

 

Currenty I have stock 3.08 gears but switching to 4.10 and I already have a new ignition system, carb and intake. What would be the highest compression I could have w/ 91 octane?

Also, can't the 10 bolt handle 400hp??

Oh and I spun a rod bearing So I'm not sure if the crank is even worth a ****.

 

it can always be machined buta new crank isnt too much on the wallet

 

Yea, I'm hoping to find a decent shortblock and just swap over the top end that I already have.

Heres my cars
http://www.cardomain.com/memberpage/501903/4

 

the 10 bolt won't live very long. But that depends on how you drive it and your traction.
if you keep 215-65 radials and don't drag race it every weekend, beef up the rear a bit (girdle, moser axles perhaps etc.) then it should live.

I thought a crank was pretty pricey, ie $500+ ... for a new one..
maybe you can machine your crank to work?

the 305 heads on a 350 will work fine, many members here are using it to make quite respectable power... ljnowell I think.... I can't think of others off the top of my head. but yes, you will need to lower your compression ratio to run pump gas (so dished pistons).
but that depends on the cam. like chevydude said, the 274 would do that. what kind of powerband are you looking for? all top end? low end torque? just for racing? streetable?
many questions to ask yourself... -J

 

well a new cranks price depends on the cranks really... a lunati sledgehammer is upwards of $500... cast can go as low as $200 or so i think

 

Hmmmmm

Can anyone just give me a list of parts I'll need to make a high compression 350 that'll easily run 12s. I figure I'll just burn 110 since all gas is expensive I might as well have fun. I know my friend has a set of 2.02 heads he had on his 406 he'd probably sell me cheap, If I got those what would be a good cam to match up with them, 4.10 gears, and a stall??

I also have hedmann headers and I believe hooker makes shorties with a bigger tube, Should I go with those too?