glintscollide

and Its the best thing I ever done tbi to carb is the way to go.I'm still working on that 383 setup.I bought a eagle 383 crank with 5.7 rod lift.Can I use stock rods from a 350 4 bolt main 76 engine block,also do i have to bore the engine .30 over or can I go stock everything else?buget builder the crank i bought is cast and can supposable handle 500 hp.Any help on this topic will be great.One more dumb question though sorry guys,if a 400 crank stroks a 350 to a 383 then whats a 383 crank strok a 350 to?Cause the crank is advertised as a 383?Please help me im confused as hell.Thanx

Apeiron

A 383 crank strokes a 350 to a 383.

Both the 383 crank and 400 crank have a 3.75" stroke, but 400 cranks have larger main journals. Back when they were used to build 383s, the journals would have to be turned down to make it a "383" crank. Now you can just buy a 383 crank off the shelf with the correct size journals to fit the 350 block.

Stock rods are find if they're in good shape, you can improve them considerable by having them resized with ARP bolts.

Since GM never made a 3.75" stroke, 4" bore engine with a 5.7" rod, there are no stock pistons you could use with that combination. You could use stock 5.565" rods from a 400 with stock 350 pistons though.

Nebu

don't you think a 750 is too big on a 305?

scooter24

hey,whats up,stick to a 650 cfm carb.dont go bigger than this

glintscollide

Ya 750 is too big but thats all i had it actually isnt too bad it boggs a little but i can handle it till the 383 is built.About the rods though summit sells rebuild kits and im plannin to buy one but do they sell that size rod with the kits if u request it?or could i just buy 5.7 rods Cause the 350 rebuild kit is also advertized with 5.7 rods?Sorry im kinda slow.

Apeiron

If you're buying a 383 kit it will probably come with crank, rods and pistons, so you won't be using any stock parts anyway.

EvilCartman

iTrader: (1)

I ran my current 750 Speed Demon on my old 305 while gathering parts for the 350. Ran really good compared to the Holley 670 pile o crap and still managed 22 mpg. First put it on just for giggles but stayed on after the car actually ran better.

glintscollide

ya mine is runnin great now.Just installed a switch for the hei dizzy to fire up.Its nice not having to get under the hood everytime i wanna turn on or off the car.On the 383 subject,apeiron you said i can use the stock rods which are 5.7" right?And I would have to use a 5.565 piston right?Im seriously confused.Or are u sayin i could use the stock rods with 400 pistons.I had an old timer tell me I could just build it with stock rods and stock 350 pistons.Is this true?Still confused.

Apeiron

Aftermarket 383 pistons and stock 350 rods (which are 5.7" long) is the only way you can use a stock 350 rod. This is the preferred way to do it these days.

Stock 350 pistons and stock 400 rods (which are 5.565" long) is the only way you can use a stock piston. Almost nobody does it this way anymore.

It's about 9" from the crank centerline to the deck of the block. A 350 crank uses 1.74" of that distance, a 350 rod uses 5.7", which means that the wrist pin on a 350 piston is about 1.56" below the face of the piston.

Increasing the stroke in a 383 increases the amount of that 9" distance that the crank eats up to 1.875", an additional 0.135". This will make the pistons stick up out past the deck of the block. The extra 0.135" needs to be made up somewhere else, either by shortening the rod by this amount (which is why the 400 has 5.565" rods), or by raising the wrist pin on the piston (which is why 383 pistons have wrist pins that are about 1.425" below the face of the piston).

Tony78_280z

LOL

What 750?

Q-jet?
Holley?
Spread or equal?

Q-jet 750 is stock for a 305 or a 350. So I'd say it would work just fine. Good low speed atomization, and no limit on your top end.

Also, what are you comparing it to? A bran new off the shelf 750 compared to a nearly 2 decade old TBI system?

GICATA

If you want to get tricky use a set of Olds Diesel 6" rods and the corresponding pistons. Heavy duty and great dwell time.

glintscollide

compared to the stock tbi system,I would take the ne wcarb any day.Will a 750 carb handle a 377?iM not boreing the engine cause I dont wanna pay the machine shop all kinds of money.So when You say a 383 piston,Does the engine have to be bored for the 383 piston?I hope you have patience cause this is my first stroker build and Imma have alot of these crazy questions.

Apeiron

Pistons aren't specified by displacement, so you'll just buy a piston for whatever actual bore, stroke and rod length you need.