Grumpy, lets say I pic up a 454, with iron heads etc. what kind of HP can I expect, if I port the stock heads, new cam and bore it out, no strokeing?
http://maliburacing.com/patrick_budd_article.htm
this is well written info
then look at
http://maliburacing.com/ (tech)....(Oval Port vs. Rect. Port - BBC cylinder head info. )
now we didn,t always do things the best way in the old days , YET WE DID HAVE FAST BBC MUSCLE CARS , a decent machine shop can add longer valves,back cut the valves, add a 3 angle valve job, do a pocket port job , add beehive springs and clearance the heads for a .650-.700 lift, you then swap to pistons that give a decent cpr in the 10.5-12:1 RANGE ,(THE RADICAL CAMS REQUIRE MORE COMPRESSION) IF YOU NEED TOO, if the heads you have are open chamber designs ,TO GET THAT cpr, ADD A NITROUS KIT UNDER THE CARB,AND and add a good solid flat tappet cam, some 4.11-4.56 rear gears and a 3500 stall converter or a manual trans, A DECENT INTAKE LIKE THE rpm AIR GAP WITH A 780-850 CFM CARB, DECENT HEADERS, and you get an old school muscle car that kicks butt!
YEAH! WE NEEDED HIGH TEST SO YOULL NEED OCTANE BOOSTERS LIKE TOLUENE OR RACE GAS
http://survivalmotorsports.com/ChevroletBBCams2.html
hot STREET
Chevrolet Performance Camshaft; Part Number SS4242
STREET/STRIP
Chevrolet Performance Camshaft; Part Number SS4254
STRIP ONLY
Chevrolet Performance Camshaft; Part Number SS4265
BUT WE EXCEEDED 500 HP VERY EASILY WITH A 427-468 bbc, and with the right parts 600hp plus is do-able
TODAY I WOULD BE HESITANT TO WASTE TIME ON STOCK IRON OVAL PORT HEADS, THERES SO MANY DECENT ALUMINUM HEADS AVAILABLE
http://store.summitracing.com/partdetail.asp?autofilter=1&part=TFS-41300001&N=700+115&autoview=sku
Airflow Chart for PowerOval Street Cylinder Heads
Lift Value Intake Flow CFM Exhaust Flow CFM
0.100" 74 64
0.200" 160 113
0.300" 231 146
0.400" 275 178
0.500" 316 209
0.600" 336 240
0.700" 347 264
Tests conducted at 28" of water (pressure). Intake with CNC-bowl blend and
CNC-inlet with Fel-Pro 1212 gasket; exhaust with 2" pipe.
BTW ,when I post answers its to a broad audiance, where I need to cover most applications, you can get that 500-600hp/tq from a 468 BBC but it will require some compromises in the driveability if your not useing a super charger,turbo or nitrous,and theres always guys that suggest that you can get 500hp from a SBC and thats true enought! but in any case the extra displacement and bigger valves and ports allow you to better any sbc results in almost any case where your not throwing huge buckets of cash at the project, and even then once you try to exceed about 500hp youll soon see the BBC has advantages and tends to be cheaper to build at some point
examples
http://www.ohiocrank.com/enginespage1.html
FEATURED ENGINE *
550 Urban Assault Engine
Price
The goal was not top horsepower, although 600 is pretty good, but a broad torque curve. This engine had 625 ft. lb. of torque at 2800 RPM and still was above 625 at 4800. Based on the brand new Merlin III block and featuring Merlin iron heads and aluminum intake the new 550 has produced some phenomenal numbers on the dyno. The engine was designed for daily street use and starts great and idles at a smooth 700 RPM. On the dyno, 18 pulls were made to optimize timing, jetting, etc. Different rocker ratios and carb spacers were also tested.
The engine features all premium components including 4340 steel crank, H-beam rods, forged SRP pistons, Sealed Power plasma moly rings, race bearings parts that will take a good shot of nitrous. A complete Comp Cams valve train is used including the latest technology hydraulic roller cam. Top line brands like MSD, Manley, Holley, and Moroso finish the package.
Options:
for aluminum heads add $800
many options available Complete engine carb to pan
$8,995
youll have a hard time building an HONEST 600hp/625 tq in a small block for $9K
This is a special project for the Super class, and serious bracket racer, that needs power and torque, but also has to make rounds all day without motor maintenance. This engine now makes 900 HP at 6400 RPM with 830 lb. ft. of torque at 4800 running 33 degrees of timing. The cam lift is only .748 and the rockers are Jesel shaft mount. No need to check valve springs and lash between rounds. Engines are built with Merlin III blocks, Brodix BB3X, or Dart 345 heads, Merlin X intake, Ohio Crankshaft 4340 forged 4.75" stroke crank, H-beam rods with ARP 2000 bolts, Canton pan, Comp cam, Felpro gaskets, and Melling oil system.
Every component is available off the shelf, the bore size will allow two rebores, and the compression is 14.3:1 which does not require the ultra expensive gas, or could be run on alcohol. The Best part is the price at $10995, less carb, ignition and valve covers, this is a really great deal.
Options:
Holley 1250 Carb $975
MSD Ignition $695
Valve Covers $295
Aluminum Block $2350
E85 Carb $1300
Complete Engine
$10,995
900hp/830tq from any sbc without a turbo is almost unheard of
heres 675 HP for $9K
http://www.dougherbert.com/555streetchevybb-p-25852.html
