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Big Block Chevy questions

 
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Xhiron
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Joined: 02 Dec 2002
Posts: 36
Location: Guelph, Ontario Canada
120.00 points



PostPosted: Mon Dec 02, 2002 5:33 am    Post subject: Big Block Chevy questions Reply with quote

How hard is it to shoehorn any bbc into a 3rd gen camaro? What kind of headers will work? D'y'all think that with some minor porting, new dual plane intake and a decent cam an old 454 could twist the 500ft lb level? Also, what kind of flow do some of the lower performance heads have?

Sorry about the volume of questions, I'm trying to get some resonable expectations for my winter project.

86' Z28 with a th350 (no converter yet) and a 77' Firebird 8.5 inch rear end (not yet modifyied for installation - no idea what gears I should use), replaced interior with fiberglass/plexiglass/sheetmetal/plywood and new carpet. Built a completelt new electrical system and installed a new fuel system (new everything from Summit). Moved battery to the rear and installed home-made subframe connectors, driveshaft loop and 8 point rollbar. Installed aluminum rad, trans cooler and I'm starting on the suspension in January.

Ok, my typing finger hurts. Thanks for any advice, it shall be appreciated.
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UDHarold
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Joined: 02 Nov 2002
Posts: 14
Location: Senatobia, Ms
100.00 points



PostPosted: Mon Dec 02, 2002 11:57 pm    Post subject: Cam for a Camaro Reply with quote

xhiron,

I only know that people put big blocks in 3rd gen Camaros, so it can be done.
However, I have lots of experience putting cams in big blocks, so here goes.
With a 3000SS converter, 3.7s, 468 cid, 10.5:1, 2" headers, etc, my BB288/296F10 makes about 600 BHP with 049 oval ports, and about 540-550 ftlbs of torque.
Someone on another board told me his 288/296 was giving 12.2 mpg with 10.6:1 CR, T350, 3.73s, and a 24.5" tire. This is with vacuum advance hooked up.
The BB288/296F10 is 255/263 at .050", .612"/.630" valve lift, 110 LSA, put in the engine at 103 to 106 ICL. It needs a very good fuel system, at least a Carter or Holly NASCAR pump and 1/2" #8 fuel line from tank to carb. If you run a Holly Blue pump, it takes two....
This cam has gone 100,000 miles in big blocks on the street....

UDHarold
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heavychevys
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Joined: 18 Nov 2002
Posts: 81
Location: South Carolina
754.46 points


1964 Chevrolet Belair

PostPosted: Tue Dec 03, 2002 11:30 pm    Post subject: Reply with quote

xhiron, Harold gave some good advice on the cam.The heads,049,are the best flowing semi-open chamber oval port heads Chevy made.Also,781's were the same as the 049's.They have 110 cc chambers w/ 256 cc intake and 117 cc exhaust runners.I use both models on my cars.My 70 Nova uses them and made 750+hp w/ 15.1 comp and a Lunati RRB-308-316 cam.This a all out drag cam though.The Impala uses a Lunati RRB1-232-242A hydrolic roller.It has 578 int and 595 ext. lift and 232 int and 242 ext @ .050.I use 1.8 rocker ratio to get .612 int and .630 ext lift.This a 408 BBC though.This engine makes 525+hp so it could make 600 hp in a 468.I hope this helps out some.If you got some heads already tell us the ser# and we can tell you more about them.
_________________
1964 Impala 468BBC 6.986 @ 98.69 MPH 1/8 mi

(Bothers) 69 Nova 408 BBC 6.94 @ 96 MPH
96 F250 4X4 PSD 8.24 @ 84 MPH @ 7000 lbs

www.musc.us/drag
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Xhiron
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Joined: 02 Dec 2002
Posts: 36
Location: Guelph, Ontario Canada
120.00 points



PostPosted: Sat Dec 07, 2002 1:25 am    Post subject: Whoa! Reply with quote

Ok, first thing, my th350 cannot handle anything too far over 500ft lbs. Second, for the first few months I'll have'ta be usin' manifolds and a 2500 stall converter. I've got some 3.73's being installed next month. I need a lot of torque (28 inch tires will do that) and it needs a half decent top end. What casting # are 427 hi perf. heads? I've been told that they're those kinda heads, but I haven't been able to check yet. I'm kinda hoping for about 480+ ft lbs and about 380hp off manifolds and a haydralic cam (flat tappet, can't afford a roller this year). I'm trying to keep it simple this year so next year I can throw more $$$ at it and actually see improvments. Anyways, thanks for the advice, a 600hp car would really be sweet, but too much for me right now.
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UDHarold
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Joined: 02 Nov 2002
Posts: 14
Location: Senatobia, Ms
100.00 points



PostPosted: Sun Dec 08, 2002 11:15 pm    Post subject: cam for a 454 Reply with quote

Xhiron,

No problem....
We have a number of cams that work with stock valve train pieces, and that have gone over 100,000 miles on the street, with good power.
My favorite is the BB272H12, 217 @ .050, .515" valve lift, 112 LSA. In a bone-stock 1987 Chevrolet 454 P/U engine, on the dyno at Mercury Marine, it made 370 BHP at 5000, with 21" of vacuum and a 600 rpm idle. It also gives good mileage. We also make a BB276H10, 221 at .050, same valve lift, but 110 LSA that makes about 385 on the same dyno, with 18-19" vacuum.
The largest cam I recommend for stock valve springs is our BB282/290H10, 233/241 at .050, .530"/.530" valve lift, and 110 LSA. It does not work power brakes without a canister or Rhoades lifters. However, the power is around 450-460 BHP at 5800...... And of course, a rough idle....
Hope this information is of some help.....

UDHarold
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Paul P
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Joined: 15 Aug 2002
Posts: 2393
Location: Townsend, Mass.
81240.86 points


1971 Chevrolet Chevelle

PostPosted: Fri Jul 14, 2006 9:10 am    Post subject: Reply with quote

Is UDHarold still out there? I know his shop had some IRS problems some time ago have not seen him on since.
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artinla
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Joined: 09 May 2006
Posts: 233

8558.30 points


1971 Chevrolet Nova

PostPosted: Mon Jul 17, 2006 12:05 am    Post subject: Reply with quote

Paul-

I don't know about UDHarold, but I think Ultradyne is now selling cams as "Bullet" cams. http://www.bulletcams.com/

I have a couple of those old Ultradyne cam hats from the 80's. Man they had some good grinds. I wonder if they are the same people now?

Art
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Paul P
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Joined: 15 Aug 2002
Posts: 2393
Location: Townsend, Mass.
81240.86 points


1971 Chevrolet Chevelle

PostPosted: Mon Jul 17, 2006 1:12 am    Post subject: Reply with quote

I have one of their grinds in the motor currently. Nice stuff no problems at all with the performance. Thanks for the site reference.
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artinla
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Joined: 09 May 2006
Posts: 233

8558.30 points


1971 Chevrolet Nova

PostPosted: Mon Jul 17, 2006 8:20 pm    Post subject: Reply with quote

Unfortunately, I emailed the tech@bulletcams.com and got an undeliverable error. They may be gone after all.

I will call the number tomorrow and see if I can raise anyone.

Art
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Big Dave
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Joined: 04 Dec 2005
Posts: 2644
Location: Tampa Florida
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PostPosted: Mon Jul 17, 2006 9:27 pm    Post subject: Reply with quote

Third gen Camaros also are cursed with 7.5" rear ends so the TH350 and the rear will leave for parts unknown if abused by a BBC. You will probably need to back half the car since GM put in a big hole called a hatch back in all 3rd generation Camaros. While you are cutting and welding I'd unbolt the front end and forget about just the back half and go with a full frame (Chris Alston http://www.cachassisworks.com/) or http://www.competitionengineering.com/ which also sells frame components and full cages. Makes it easier to use front and rear motor mounting plates.

If this is starting to scare you don't forget you can get can overpower the rear wheels with just about any car with a small block for less money than a big block, and with fewer problems.


Big Dave
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af2
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Joined: 01 Sep 2003
Posts: 5557
Location: grassvalley, ca
71191.50 points


1933 Willys Coupe

PostPosted: Mon Jul 17, 2006 10:21 pm    Post subject: Reply with quote

Big Dave wrote:


If this is starting to scare you don't forget you can get can overpower the rear wheels with just about any car with a small block for less money than a big block, and with fewer problems.


Big Dave


Dave, I agree until the small block gets nads Shocked Alot of people think the small one is the one to be beat on. I also have a big block on the shelf that I haven't run since 86'. I will leave it at 433 and get the up to date heads,cam and intake to get way more than 1.5 hp per ci. As far as rear tires we will see. Very Happy Adam
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artinla
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Joined: 09 May 2006
Posts: 233

8558.30 points


1971 Chevrolet Nova

PostPosted: Tue Jul 18, 2006 3:28 pm    Post subject: Reply with quote

Paul-

I just talked to Bob, the owner of Bullet Cams. He gave me the scoop.

Ultradyne went bankrupt, Harold was the owner. Bullet bought all the equipment, masters, blanks, etc and hired Tim and a couple of the cam grinders. They are selling all the same grinds plus a few of Bullet's own favorites. I told him to clean out that tech support mailbox so that we could get in touch with them again. He said that he would.

(662)893-8022 in case he lied.. Laughing

Art
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BobB
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Joined: 24 Oct 2006
Posts: 2

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PostPosted: Thu Oct 26, 2006 6:31 pm    Post subject: Reply with quote

I know this is an old post,but what the heck. Wink

UDHarold can be found on Team Chevelle.

http://www.chevelles.com/

And you can use the Patriot clipster headers for BBC install in 3rd gen with stock sbc mounts. You have to trim alittle of the clamshell mounts to fit em,but better than buying Hookers swap headers.
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Aerosmith
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Joined: 25 Dec 2002
Posts: 232
Location: Ohio
7771.70 points



PostPosted: Fri Oct 27, 2006 2:47 pm    Post subject: Reply with quote

Late as usual, but there are tons of things available for the 3rd gen f-bodies short of the full frame route. The most popular are tubular front k-members, tubular a-arms, front coil over conversions, bolt in 9" ford axles, adjustable lca's, torque arm and panhard bar. These things are getting in the single digits with as little as the rear axle stuff..and a few on the 'weak' 7.5 10 bolts! The key to the 7.5 is to fully weld the axle tubes to the center, install new axles, replace the main cap bolts with studs and use an aluminum girdle type rear cover. There are 10 second cars that have made hundreds of passes using this setup. Admittedly there are thousands who break after just a few passes on an unprepared rear too.
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