Because the carb couldn't keep up. That was with a 1150 double pumper. Too much gas. Occasionally I run really steep hills. Hair on fire, hold on tight! Someone told me about Vortec heads, and it was on. I'm in a class where superchargers & nitrous are not an option, but fuel inj is. If you port & polish severely, but with care, you can have a TPI with about 900cfm. That 1000cfm double shoebox blows. Injectors, 65/hr. 66mmthrottle body.

My rig is currently in Iceland. Will be back in May, will send pics when I get there.

 

could fuel injection work on something spinning that high? what about supercharging?

 

Even if you could get 900cfm out of a TPI, the air still has to traverse a winding 22in of intake runner. 10000rpm out of a TPI is about 5000rpm more than anyone else has been able to get out of a long-runner setup, Id like to see that dyno chart.

 

I need some information what is the stroke of a 305? And rod length?

 

3.480"
5.700"

 

Thanks so with a 4.125 bore and a stroke or 3.480 it will end up being 372in³ or 6.1L

 

what the advantage of a big bore??

 

Less valve shrouding.

 

Umm.... Whats that?

 

A 2.02/1.6 valve combination suface area:
Pi*r^2 = surface area

3.14159* 1.01^2 = 3.204
3.14158* .8^2 = 2.01

3.204+2.01 = 5.205 square inches of surface area for a 2.02/1.6 valve combination

Now, for a 4" bore (like a 350):
3.14159* 2^2 = 12.566 square inches of surface area.

Now for a 4.125" bore (like a 400):
3.14159* 2.0625^2 = 12.959 square inches of surface area

What does all this mean? A 2.02/1.6 valve combination would cover (or shroud) 41.41% of the top of the cylinder during overlap on a 4" bore 350. The same valve combination on a 4.125" bore 400 only shrouds 40% of the top of the cylinder. It makes a bigger difference when you are comparing say 3.5" bore to a 4" bore.

 

ok thanks that makes some sence. So did this thread die?

 

What's even more important is how close the edge of the valve comes to the cyl wall.... pretty hard for something to flow around a valve, no matter how big it is or how far open it is, if there's no space around the outside edge.... that extra 1/16" of bore makes a big difference with big valves and high-flow heads and tall cam lobes.

 

That motor combo reminds of one of my friends motor combos! He took a 427 rat motor, put a 396 crank in it. He called it a "short-stroke big block". It revs upwards of 9000rpms, and is capable of low to mid 9s in a 68 ss nova. It sounds ungodly! It will do 3rd gear donuts!

 

A 427 with a 396 crank = a 427

Kind of like how a 305 with a 350 crank = a 305

Sounds like your friend doesn't know much about big blocks

 

I found a 400 bare block. How do i know if its blown or if it damaged, its my teacher.

ok this is what i figure
Bore Diameter [in] - 4.125
Stroke Length [in] - 3.480
Combustion Chamber Volume [cc] - 64
Head Gasket Compressed Thickness [in] - .025
Head Gasket Bore Diameter [in] - 4.155
Piston To Deck Clearance [in] - .025
Dish/ValveRelief/Dome Volume [positive cc] - .200

RESULTS
Displacement, [cubic inches] - 372.0548909738467
Displacement, [liters] - 6.0968873103742505
Static compression ratio - 11.18459183754278

Will that be able to run off pump gas?

 

with very conservative timing and an aluminum head, yes, but would run better with some 100octane in it.

 

Aluminum heads sound expensive. What can i do to lower the compression?

P.S. are you sure that the 305 heads are 58cc? i heard it was 64cc?

 

you heard wrong, the 305 heads are 58cc. you could either put different heads on it, or different pistons. otherwise you will have detonation problems.

 

427 block + 396 crank = (drumroll please....) 427ci.

 

He is know to be full of sheot, so yeah he probably doesn't have a clue what he's talking about. I have no clue when it comes to mixing, and matching crankshafts, with different blocks, and vice versa. So I'm going on what I was told.

 

No need for that... http://www.mortec.com/borstrok.htm

 

This is an actual example of a 377 engine.Hopefully the engine will be in my car by the end of the year albeit minus the injection,heads and a couple of other bits.



6.2 litre 4.125 bore (not oversize) 3.48” stroke (new liners)

NEW 18B Brodix aluminium large valve heads titanium 2.15”/1.6” s/s

Complete with individual runner fuel injection

630 bhp at 6500/7000 rpm

520 lb ft at 5500/6000 rpm 465 lb ft at 3500 rpm

Recommended rpm – 7500 rpm

Callies Stealth 4340 3.48” crank

6.1/8” 4340 Carrillo rods

Wiseco full race pistons low weight low height

Isky machine shop settled valve springs

Titanium retainers

Crower 262/272 at 050” roller cam .65” lift

Gear cam drive

Crower offset high seat roller lifters

Short push rods

Offset roller rockers

Edlebrock cast ali valve covers

New flywheel

Kinsler individual runner intake with electronic injection, fuel rails etc., and spare set of injectors

Complete ignition system and loom. Distributor and Crank trigger etc

Jems MKII ECU mapped on dyno

Runs on 100 octane petrol 11.0 COMP RATIO



NOTES Won the Castle Combe GT championship

In 2001& 2003 in the STEALTH B6

ALL INTERNAL PARTS RENEWED IN 2002

All parts are only 1200 miles (NOT 12000) and comes with full re-build with new bearings and rings.
Reputed to be highest power small block Chevy in UK .
Parts cost Bob Light £20,000 plus £6,000 for intake, electronics . and ignition system and £2000 dyno and my cost for full rebuild.

ie total £30,000

Ali block weighs only 40 kg . (half of Iron block )
Needs only front pulleys, water pump and water and oil piping to run


Available complete or may split



Dry Oil Pump, mocal oil coolers available



Price negotiable

 

shrouding. ..deshrouding..