turbochargers

nuff said

 

mild, longevity, 500hp and sbc... hmmm gonna want more than 400 CID unless you pressurize it... 427, 434, etc... pretty common combinations these days.. 500 hp is pretty easy with those displacements, given good parts on top.

for a pair, professionally built, dyno'd... not skimping when it comes to parts, etc.. you are gonna need more than 20K... if you plan to do the drives and such too...

 

Machining and assembly of the shortblock is all we will have done on the outside.....the rest will be assembled by myself and his brother who is also a big gear head.....and when done they will be taken over to an engine shop to be broken in and dyno'd.....so that should save some money..... also all parts will be bought by us...they have a few good contacts for parts seeing as they restore muscle cars....

 

Pair of 421CID SBC
3.875 Stroke
4.155 Bore
6.00 Rods
230cc Dart Iron Eagle/World Products Motown
Single Plane Intakes
Prepped 800 cfm carbs
9 to 1 compression.

Should put you in the 490 to 525Hp all day long. Should make close to 550#/ft of torque.

 

Oh...i forgot to mention and i dont know if this would make a big difference or not......the engines allready have a gil 3.5" dry exhaust....water dumped right at the tips and a set of Gaffrig clamp on muffs on the end. Which is all staying....

 

Dry exhaust is going to probably be mandatory if doing NA.

So, that being said, to build the motor shouldn't be much of an issue, it's just the camshafts that will be required along with the exhaust system.

Oh, fuel octane too. Will need 92-94. Remember, rumour has it that in a year or two 91 octane will be max at all pumps.

 

i assume you have 350's now?

 

yes it has 350's right now....and 91+ octane is no problem....its all he runs in it now and he trailers the boat everywhere....

 

Oh...i forgot to mention and i dont know if this would make a big difference or not......the engines allready have a gil 3.5" dry exhaust....water dumped right at the tips and a set of Gaffrig clamp on muffs on the end. Which is all staying....

Right when I hit send on my post. :laugher: :laugher: :laugher:

Beautiful - let's get started.

400cid with RMBuilder AFR heads and camshaft. Done deal.

 

Pair of 421CID SBC
3.875 Stroke
4.155 Bore
6.00 Rods
230cc Dart Iron Eagle/World Products Motown
Single Plane Intakes
Prepped 800 cfm carbs
9 to 1 compression.

Should put you in the 490 to 525Hp all day long. Should make close to 550#/ft of torque.

Can I vote if cast iron ? Iron Eagle's or GMPP Vortec Bowtie Large Ports .

 

Can I vote if cast iron ? Iron Eagle's or GMPP Vortec Bowtie Large Ports .

I agree... for a budget build. . .there were some deals on some Iron 220 Motowns with 72cc.

 

i have a brand new set of dart 200 cc platinum's that i need to get around to cleaning up while my roundy round parts are being balanced... complete, they are a decent bang for the buck... cept i have a few concerns here and there just by glancing at em...

 

Right when I hit send on my post. :laugher: :laugher: :laugher:

Beautiful - let's get started.

400cid with RMBuilder AFR heads and camshaft. Done deal.

http://www.airflowresearch.com/chevy_dyno.php

Take dyno's with a grain of salt but will give you a heads up with what's needed. Real life experiences do show these power levels to be pretty easily attainable. It's all in the package ! And great head !

 

CFM,
This would be a great build for AFR's new 195CC/23º Street/Competition Eliminator head. These would still enable you the 500+ HP goal, with 9.5:1 compression even if you are limited to std bore 4.030" (383" vs 410+") block (thus eliminating the additional expense of "blocking for a 4.1xx" bore size).

Preliminary data shows the following flow curve for both 195 products...

INT.....Street.....Comp

.200.....137........140
.300.....194........202
.400.....240........248
.500.....270........280
.550.....280........292
.600.....286........300

EXH.....Street.....Comp

.200.....110........115
.300.....158........165
.400.....190........200
.500.....207........217
.600.....215........225

All numbers tested on an SF600 with a 4.060 Bore. Exhaust #'s thru a 1.75" flowtube to simulate a header attached to the exhaust port. These numbers are guaranteed by AFR to be accurate to 3% as advertised.

Many worked heads don't make 300 CFM @ .600". These not only make that number, but do so with a true 195 CC intake port out of the box giving maximum velocity throughout the curve. Equally impressive is the 194/202(Intake) CFM @ .300" number. Properly set up they will provide both mid-range TQ and HP on top.

I would agree also the Lg Port Bowtie Vortec is a very impressive iron cylinder head and a good iron choice. It would require a different setup to make the goal.
Bob

 

RM - do these have a due date, if not available now ? I really think this would be a perfect head for a marine type 383-410cid small block.

I know alot of people are itching for this animal.

 

Pair of 421CID SBC
3.875 Stroke
4.155 Bore
6.00 Rods
230cc Dart Iron Eagle/World Products Motown
Single Plane Intakes
Prepped 800 cfm carbs
9 to 1 compression.

Should put you in the 490 to 525Hp all day long. Should make close to 550#/ft of torque.

I needs me two of them as well :bigsmile: :bigsmile:

.....


I am very interested to see what happens with this build. I LOVE BIG INCH SMALL BLOCKS

 

Talking with the guy earlier today he's geeked on some blower motors now! .......i see me getting very friendly with these engines for a long time now! Anyway the initial engine looks like the 690hp model off the air flow site:

383ci with Eagle rotating assembly....all checked out and reballanced...we have a good shop for to this.
671 blower
AFR 195 heads
pair of holley 650's on each engine
he allready has a full MSD ign system
allready have a Gil 3.5" dry exhaust that will be staying
Cam off the AFR site looks good considering its on a 114CL...should work good in the boat.....but other suggestions we are open to

looks like the mercII trans will be getting extra clutch plates for the xtra HP
The TRS drives will be fully gone through while its all apart to be sure its solid.....but 10+years of hard abuse and they took everything that these two guys threw at them without a hickup!!!

i will be tearing the one engine that has water in it appart maybe even this weekend......he has another shortblock to swap over parts to just to make it through the rest of this season.......the new blocks/parts will be ordered by the end of next month he says.....this should be fun!

 

Talking with the guy earlier today he's geeked on some blower motors now! .......i see me getting very friendly with these engines for a long time now! Anyway the initial engine looks like the 690hp model off the air flow site:

383ci with Eagle rotating assembly....all checked out and reballanced...we have a good shop for to this.
671 blower
AFR 195 heads
pair of holley 650's on each engine
he allready has a full MSD ign system
allready have a Gil 3.5" dry exhaust that will be staying
Cam off the AFR site looks good considering its on a 114CL...should work good in the boat.....but other suggestions we are open to

looks like the mercII trans will be getting extra clutch plates for the xtra HP
The TRS drives will be fully gone through while its all apart to be sure its solid.....but 10+years of hard abuse and they took everything that these two guys threw at them without a hickup!!!

i will be tearing the one engine that has water in it appart maybe even this weekend......he has another shortblock to swap over parts to just to make it through the rest of this season.......the new blocks/parts will be ordered by the end of next month he says.....this should be fun!

Wally,
If this guy is willing to spend this kind of money then I would build to Super SB. Get a pair of 9.325" deck SBC. Go with a 4" stroke crank and 4.185" with a 6 rod for 440CID SBC. Put 9 to1 compression in them and in NA form they will run for 250 to 300 hours no problem making 525HP all day long below 5800 rpm.