Big Block Chevy
Thread Starter
TECH Addict
Joined: Oct 2002
Posts: 2,793
Likes: 100
From: Mefis
Big Block Chevy Does anyone know BBC engines? My dad has given me a 1973 2 bolt 454. It has a cast crank, and is standard bore. I would like to rebuild it and stick it in a early Nova. This project will probably take place over next summer, as I need to save some $. Does this sound like a good plan?
.030 overbore, 10:1 forged pistons
AFR 295cc CNC ported oval port heads, Solid roller springs
Comp Solid Roller: (110 LSA) 236/242 @ .050 .639/.646 with 1.7:1 rockers
Stock crank, Clevite 77 bearings, rebuilt stock rods, with Wave-loc bolts
Main studs, radiused oil entry on #5 main cap
Single plane intake, 750 double pumper, BG or Holley
Comp, Steel roller rockers
Probably some kind of cross ram would be in it's future.
.030 overbore, 10:1 forged pistons
AFR 295cc CNC ported oval port heads, Solid roller springs
Comp Solid Roller: (110 LSA) 236/242 @ .050 .639/.646 with 1.7:1 rockers
Stock crank, Clevite 77 bearings, rebuilt stock rods, with Wave-loc bolts
Main studs, radiused oil entry on #5 main cap
Single plane intake, 750 double pumper, BG or Holley
Comp, Steel roller rockers
Probably some kind of cross ram would be in it's future.
Last edited by 2002-4.8; Nov 6, 2003 at 01:31 AM.
all though it is a two bolt, and is not the strongest, run a nice forged crank, and then bore .060. a nice solid roller 468 would be a torque monster. some nice forged Keith Black pistoms or some from JE or even lunati would be nice. Hell that is a good motor to be handed to. take it and run. just make a bad *** 11 second nova out of it. It will not take much. how bout a little giggle gas to go on the motor also!
TECH Fanatic
Joined: Aug 2003
Posts: 1,049
Likes: 0
From: Newport News, Va
Originally Posted by 2002-4.8
Would the conversion to 4 bolt mains be necessary at the power level I will be at?
I have ALWAYS been told and read, that 4 bolts are better for high performance.
Hope this helps
Trending Topics
well the question is what is the power level you want to acheive? if it is around 600+ the conversion would be better for your longer lasting durability, and just to make sure it doesnt grenade on you! good luck.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
TECH Fanatic
Joined: Jan 2002
Posts: 1,471
Likes: 0
From: Houston, TX
Depends on how much you want to risk. My brother in law is running a 454 with GMPP heads, cam (sorry don't know the specs of cam) Air gap intake, and a 100 shot on his 68 camaro and I believe he only has a 2 bolt. It is a 454 from an '80 one ton truck. No problems yet. Still trying to get dialied in though so it hasn't been beat on too bad. We keep having other problems.
TECH Addict
Joined: Nov 2001
Posts: 2,956
Likes: 0
From: Monroe, SD
with a stock crank, it probably wouldnt matter much but if you are gonna build it why not build it right. a solid roller set up aint cheap. id spend the money on the bottom end and just go with a good solid tappet
Thread Starter
TECH Addict
Joined: Oct 2002
Posts: 2,793
Likes: 100
From: Mefis
So then, if I were to spend the money on a forged crank and rods(which seems lke the right thing to do), with the 4 bolt conversion: should I go with the stock stroke, or use a 4.25" stroke?
TECH Fanatic
Joined: Jan 2002
Posts: 1,471
Likes: 0
From: Houston, TX
You could do both if you want, just depends how much you want to spend. Since you area already planning on buying a new crank you could add more stroke. I assume you are buying new pistons so you could get what ever size you want, you would just need to have to it bored. Which is a good idea to clean up the cyl. walls anyway. Speed cost $$$. How fast do you want to go?
http://www.milodon.com/maincaps/pg57.htm
http://www.milodon.com/maincaps/pg57.htm
Last edited by boos2; Nov 7, 2003 at 11:11 AM.
Launching!
Joined: Aug 2003
Posts: 216
Likes: 0
From: Phoenix, AZ
A 2 bolt block is plenty strong for what you described in your first post. The only thing I would get is the 7/16 rods if you only have the 3/8 rods but you don't even need that if your building this motor for low end torque. Also don't bore it .060 over unless you have to. You could probably run a bigger cam and still keep it streetable as well depending on where you want to make your power.
If you plan on changing cranks and mains you might as well just sell that motor and get a 4 bolt motor that already has all the good stuff. That being said BBC's are pretty stong motors in even their lower performace forms. More so than SBC's in my opinion.
If you plan on changing cranks and mains you might as well just sell that motor and get a 4 bolt motor that already has all the good stuff. That being said BBC's are pretty stong motors in even their lower performace forms. More so than SBC's in my opinion.
everything you want to do is great. you don't need 4 bolt mains or a steel crank to do what you want to do. personaly i would go w/a hyd roller over a solid just because of maintance, running rockers all the time, having to have a rocker girdle, ect. if you are worried about main bearing life, put studs in the stock 2 bolt caps and here it line-bored. i would athough go w/ 7/16 rod bolts. here is the best site for BBC parts.
http://www.ohiocrank.com/
you can get new 4340 7/16 rods for as low as 169 bucks. there stuff is very good quality.
we have gone as fast as 9.58 @ 143 with a 2 bolt, cast crank 454 w/stock ported oval port heads, 12-1 pistions, 1050 carb, 300hp NOS big shot hit. the motor is in a 3000lbs street camaro, and is 7 years old, has had the bearings changed once. the crack in the block i wouldn't worry about unless a good machine shop says to. my stock '84 454 block in my firebird has always had a crack from the lower right oil galley plug to the bolt hole above it. that motor last dynoed 825 rwhp with a 275hp fogger hit.
hope this helps
john
http://www.ohiocrank.com/
you can get new 4340 7/16 rods for as low as 169 bucks. there stuff is very good quality.
we have gone as fast as 9.58 @ 143 with a 2 bolt, cast crank 454 w/stock ported oval port heads, 12-1 pistions, 1050 carb, 300hp NOS big shot hit. the motor is in a 3000lbs street camaro, and is 7 years old, has had the bearings changed once. the crack in the block i wouldn't worry about unless a good machine shop says to. my stock '84 454 block in my firebird has always had a crack from the lower right oil galley plug to the bolt hole above it. that motor last dynoed 825 rwhp with a 275hp fogger hit.
hope this helps
john
Thread Starter
TECH Addict
Joined: Oct 2002
Posts: 2,793
Likes: 100
From: Mefis
I always wanted to experience running the valves. My dad tells these stories about a solid roller 427 he had in a '55 chevy I would like to try it for a while, in a track car.
nxfirebird: that is what I am tryng to do, except without nitrous, that info you gave makes me believe that it can be done with a stock crank. Thanks a lot!
nxfirebird: that is what I am tryng to do, except without nitrous, that info you gave makes me believe that it can be done with a stock crank. Thanks a lot!
Originally Posted by 2002-4.8
I always wanted to experience running the valves.
nxfirebird: that is what I am tryng to do, except without nitrous, that info you gave makes me believe that it can be done with a stock crank. Thanks a lot!
nxfirebird: that is what I am tryng to do, except without nitrous, that info you gave makes me believe that it can be done with a stock crank. Thanks a lot!
stock mildly ported iron square ports
any 7/16 rods stock, or after market
stock stroke crank, stock or aftermarket
victor R intake, box stock 1050
12.5 to 13 to 1 pistions
lunati roller cam # 50205, and everything to support it.
thats it!
it's basicly a stock chevy LS-7 w/a big cam, big carb, and big intake. this combo i had in a 3270lbs 1967 untubbed street driven camaro. the car had a 4500 convertor, T-400 w/a TCI brake, 4.10 gears, and E/T streets. i drove the car to and from the track, it ran low 10s @ 130+ N/A.
ps. it ran mid 9s on the sqeeze.
man i miss that car, hit the wall in a heads up race.