Looking for BBC intake suggestions

bigblockwagon · 08-20-2008, 08:17 AM

Current springs are 230# seat pressure so I'm sure they would have to go, as would retainers.I'd guess that a triple spring around 300# is needed. Even a cheap cam will turn into a $1500+ project.

Scott

Aaron Keown · 08-20-2008, 12:20 PM

As far as making a short street cruise I don't think it would be a problem,except for the gas mileage.Most of the superstock guys drive their cars up to the staging lanes and back to the pits after a run.If you did make a street cruise I would be sure to run the lash when finished,but that is something I would think you have to do currently with the cam you have now.As far as springs go a comp 947 would probably be the best choice,we also have many sets of those that instead of having 300 lb @ 2.100 they have 280 lb on the seat,they work great on bracket cars.Do you know what you valve clearance is with the cam you have now?

Tim H · 08-20-2008, 12:57 PM

Edelbrock Victor Jr. , worked well for me. I ran 454 +.030, Speed pro 12.5 to open ch piston, .688 lift roller cam w/ dur somewhere around 270 and in 3100 lb Camaro went 6.60's. Intake was box stock, carb was 850 cfm, TH 400 trans 4200 stall. Heads were stock GM #990 LS7 castings w/2.19 &1.88 valves. I had been using box stock Holley Strip Domonator intake but wanted more/crisper bottom end.Headers were Hooker Super Comp 2 1/8".
Ran a best of 108 mph in 1/8 mile with that particular motor. 60' times were in the high 1.40's, using slicks.

bigblockwagon · 08-23-2008, 04:01 PM

Currently shift at 7300 and go thru lights at about 6100 in third (would probably be closer to 7400 on a quarter mile track). As best as i can remember without checking, valve to piston clearance is approx .120 intake and .140 exhaust. Present rockers are Crane aluminum rollers, stud mount. That Jesel deal sounds a little pricey for a budget street car class. How much spring pressure and lift could I get away with using stud mount rockers?

Scott

Bryan Broaddus · 08-24-2008, 05:19 PM

You can run the Crane roller rockers with a Super Stock roller cam but you need to change to the very high quality ARP rocker studs. There are several different ones offered but only one will last. They are sold in packages of 8 and have a longer shank that goes into the head. These may need to be trimmed to keep from bottoming out in the port roof. Use a good stud girdle and it will work fine. I have run this setup on Super Stock engines over 8000 rpm with no problems. Make sure you have plenty of spring pressure 350 to start and 300 minimum. Also make sure the pushrods are up to the task. Minimum .120 wall 3/8 dia. Otherwise flex will wreak havoc on your valvetrain.

You may want to look at opening up the LSA to 110 or 112 to make more top end power and take a little out of the bottom end. A 1 or 2 inch Wilson spacer will help too.

Good Luck!

08-20-2008, 08:17 AM	#1
bigblockwagon Junior Member Join Date: Jan 2006 Posts: 7 Likes: 0 Liked 0 Times in 0 Posts	Re: Looking for BBC intake suggestions Current springs are 230# seat pressure so I'm sure they would have to go, as would retainers.I'd guess that a triple spring around 300# is needed. Even a cheap cam will turn into a $1500+ project. Scott

08-20-2008, 12:20 PM	#2
Aaron Keown Junior Member Join Date: Mar 2004 Location: 1710 Dutch Lane,Jeffersonville,IN Posts: 63 Likes: 0 Liked 0 Times in 0 Posts	Re: Looking for BBC intake suggestions As far as making a short street cruise I don't think it would be a problem,except for the gas mileage.Most of the superstock guys drive their cars up to the staging lanes and back to the pits after a run.If you did make a street cruise I would be sure to run the lash when finished,but that is something I would think you have to do currently with the cam you have now.As far as springs go a comp 947 would probably be the best choice,we also have many sets of those that instead of having 300 lb @ 2.100 they have 280 lb on the seat,they work great on bracket cars.Do you know what you valve clearance is with the cam you have now?

08-20-2008, 12:57 PM	#3
Tim H VIP Member Join Date: Jan 2007 Posts: 1,041 Likes: 1,071 Liked 481 Times in 158 Posts	Re: Looking for BBC intake suggestions Edelbrock Victor Jr. , worked well for me. I ran 454 +.030, Speed pro 12.5 to open ch piston, .688 lift roller cam w/ dur somewhere around 270 and in 3100 lb Camaro went 6.60's. Intake was box stock, carb was 850 cfm, TH 400 trans 4200 stall. Heads were stock GM #990 LS7 castings w/2.19 &1.88 valves. I had been using box stock Holley Strip Domonator intake but wanted more/crisper bottom end.Headers were Hooker Super Comp 2 1/8". Ran a best of 108 mph in 1/8 mile with that particular motor. 60' times were in the high 1.40's, using slicks. Last edited by Tim H; 08-20-2008 at 01:00 PM.

08-23-2008, 04:01 PM	#4
bigblockwagon Junior Member Join Date: Jan 2006 Posts: 7 Likes: 0 Liked 0 Times in 0 Posts	Re: Looking for BBC intake suggestions Currently shift at 7300 and go thru lights at about 6100 in third (would probably be closer to 7400 on a quarter mile track). As best as i can remember without checking, valve to piston clearance is approx .120 intake and .140 exhaust. Present rockers are Crane aluminum rollers, stud mount. That Jesel deal sounds a little pricey for a budget street car class. How much spring pressure and lift could I get away with using stud mount rockers? Scott

08-24-2008, 05:19 PM	#5
Bryan Broaddus Member Join Date: Jun 2002 Posts: 104 Likes: 2 Liked 18 Times in 4 Posts	Re: Looking for BBC intake suggestions You can run the Crane roller rockers with a Super Stock roller cam but you need to change to the very high quality ARP rocker studs. There are several different ones offered but only one will last. They are sold in packages of 8 and have a longer shank that goes into the head. These may need to be trimmed to keep from bottoming out in the port roof. Use a good stud girdle and it will work fine. I have run this setup on Super Stock engines over 8000 rpm with no problems. Make sure you have plenty of spring pressure 350 to start and 300 minimum. Also make sure the pushrods are up to the task. Minimum .120 wall 3/8 dia. Otherwise flex will wreak havoc on your valvetrain. You may want to look at opening up the LSA to 110 or 112 to make more top end power and take a little out of the bottom end. A 1 or 2 inch Wilson spacer will help too. Good Luck! __________________ Bryan Broaddus 7568 STK ,SS