355
sportsman 2
12.3 cr
750 vs holley
7546 weiland intake
comp 268h
hei dist.
alt and water only
78 camaro no int.
racing seat
th350 with acc3000 stall
4.56 welded rear
28x10 slicks
battery in back
sfc
no intr fenders
no steel bumper in front

Is there a question in there somewhere??????

Just a few observations:
With 12.3:1 compression were talking race gas,,, but with slicks it seems this is a race car. So why the puny hydraulic cam? The Sportsman II's are not the best head by far, but a good entry level race head. It comes to a point of diminishing returns when yo start to spend big bucks to have a set of heads professionally ported. Many shops will charge around $1000 to do a all oput race port job. For that $1000 and what you can get out of selling the Sportsmans, you can have a much better 'out of the box' head,, and have room to grow later on. It's easy to spend someone else's money, but cam and heads would be the first place I'd look to step things up here. Of course, once you making gobs of power you have to start looking at traction, safety devices, weight reductions,,, and the list is just starting. ;)

if you were changing cam what would you pick

if i had to choose,, i'd pick something arround 256-263@.050 duration on 108lsa and a matching converter like 4000-4200 and a victor jr. intake manifold. that should match you up fairly well. i'd go with a double pumper carb too. looks like a race car to me too. like high octane only. bump those up and you should fly. should match well with your heads and compression. my 2 cents.

looking for mid 12
and i run 110 turbo blue
this aint my first engine i've rebuild 1500 hp turbines for uncle sam

now work on diesels for him

I bet you're not far off a mid 12 with your current setup.
What is welded on your diffy, hopefully not your spider gears.

I agree with everyone,just match your parts front to back.

I bet you're not far off a mid 12 with your current setup.
What is welded on your diffy, hopefully not your spider gears.

mine has the 2 side gears that the axle's ride in,, welded to the side casing of the diff. the 2 smaller gears aren't even in there. just the pin/shaft to hold the c-clips in.

mine has the 2 side gears that the axle's ride in,, welded to the side casing of the diff. the 2 smaller gears aren't even in there. just the pin/shaft to hold the c-clips in.

SHAME on you,,, you do know that the welded spiders is not legal on any track? (NHRA of IHRA). The day the weld lets go and turns the car sideways,,, we are going to tell you "I told you so" :rolleyes:

yeah marv,, shame on me. it's just wrong. i admit it. it's next on the list. zs10 and i have been talking 9 inch stuff over the last year. he's lined me out on ones to look for. this 10 bolt won't hold much longer like it is with this new combo. and i don't want to be in it when it comes apart. it's been that way since 1993. buying time.

but,, i'm hoping it'll make a backroad charge or two with limited/no traction just to get the engine running well enough. i definately won't be on a sticky surface with it till it's replaced with a 9" or a spool w/eliminators. i wouldn't wish that on myself,, much less the guy in the other lane,, or the stands. it's probably my weakest link right now......

thank you guys

wow you should be in the 260+ @ 50 solid with a 106 and going for 10's? Thats my motor with an extra point of compression!

Wow that's a lot of compression for something that is only expected to hit the 12's.And that intake is poo.
Just take those heads off and have them pocket ported before you do anything.That's all you need to do with those for the 11's.

Change your intake to a Victor JR or a Weiand Team G because you're going to need to use those upper rpm's with those 4.56 gears.
Change the cam to something a bit larger.One of my friends used this http://www.holley.com/data/Products/Technical/30115.pdf and it was a 11'50 runner with a 10 inch 3500 converter in an 11:1 350.

Lunati cam PN#30115 290 300 240 250 520 540 106

Add a 1 5/8 inch full length header and she'll be good to go.Look for the 11's with proper tuning.
You are going to want to change that HEI to a full aftermarket set up like a MSD 6A or better.Or if you want to stick with the HEI style look at DUI http://www.performancedistributors.com/gmdistributors.htm

When you want a lower ET just change the cam to a solid roller.Something with an intake duration of 250-256 at .050, 106 LSA.Then give ATI a call, give them your spec's and ask for a Treemaster converter.Then get a trans blanket, aftermarket axles, lap belts, and a roll cage.
Oh, and hang on to your head when you launch :p

i'm putting 12-678-4 comp cam
buy intake this summer
i have hooker super comp with 1 3/4 tubes right now
so it going to be sportmans 2
12.3 cr
750 holley with proform center
3500 stall
3300lb camaro
4.56 gears
i have 6a box too and msd wired

SHAME on you,,, you do know that the welded spiders is not legal on any track? (NHRA of IHRA). The day the weld lets go and turns the car sideways,,, we are going to tell you "I told you so" :rolleyes:


Yeah I snapped the welds pulling in a gas station once and launching at the track once then Went mini spool for 6 yrs or so then when richmond lock-rite.

i'm putting 12-678-4 comp cam
282 290
244 252
520 540
110

That should work.You might have them grind it (special order)on a 106 LSA.

OR you could get one of these cams.Note both of them have more lift and a narrower LSA.
Lunati 40135 http://www.holley.com/data/Products/Technical/40135.pdf
This is what I'd go with because the Sportsman heads don't have a good exhaust port and the extra duration would probably help.
283 293
244 254
532 555
106

Lunati 40150 http://www.holley.com/data/Products/Technical/40150.pdf
283 288
244 249
530 543
106




3500 stall


Don't get a B&M converter.Whatever you do make sure it is advertised as at least a 10inch 3500+ stall speed.If it say's 3200+ it might not stall as high as you need it too.

i'm putting 12-678-4 comp cam

I dont think thats the right cam for you, Go more duration & tighter LSA I think you'll be leaving 3-5 tenths on the table

Brand: COMP Cams
Product Line: COMP Cams Oval Track Camshafts
Cam Style: Mechanical flat tappet
Basic Operating RPM Range: 2,800-6,200 RPM
Intake Duration at 050 inch Lift: 242
Exhaust Duration at 050 inch Lift: 250
Duration at 050 inch Lift: 242 int./250 exh.
Advertised Intake Duration: 280
Advertised Exhaust Duration: 285
Advertised Duration: 280 int./285 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.507 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.532 in.
Valve Lift with Factory Rocker Arm Ratio: 0.507 int./0.532 exh. lift
Lobe Separation (degrees): 106
Intake Valve Lash: 0.020 in.
Exhaust Valve Lash: 0.022 in.
Computer Controlled Compatible: No
Grind Number: CS 280B-6
Quantity: Sold individually.

If you really want to stay out of the 11's I'd suggest you NOT get a solid cam.They bring added power and torque.Also do NOT have those heads ported.

The HYD Lunati cam PN#30115 290 300 240 250 520 540 106
would still be a good bet.It would be better to use a smaller cam and less gear.But since you have a 12.3 compression ratio you need a cam with enough duration to keep you out of detonation.Also since you have a 4.56 gear you need the engine to spin a fair amount.That's why I chose that Lunati HYD cam.

I think any one of these would perform much better than the 282 in your car

http://store.summitracing.com/partdetail.asp?part=CCA%2D12%2D686%2D47&autoview=sku
http://store.summitracing.com/partdetail.asp?part=CCA%2D12%2D658%2D5&autoview=sku
http://store.summitracing.com/partdetail.asp?part=CCA%2D12%2D654%2D5&autoview=sku

i aggree with mw and thrasher. at least 8* more duration on the exaust if you're not gonna port those heads. at least 4000+ stall converter. and ignition mods later if it won't make it to 6500-6700 with the stock hei.

what fuel system are you planning on using??

i like this one from mw's choices:
http://store.summitracing.com/partdetail.asp?part=CCA%2D12%2D686%2D47&autoview=sku

if the power is there,, you should see the full 7000 in the traps. if not,, it'll cross lower in rpm. certianly will cross lower with a smaller converter.

i had a holley blue pump with reg. and gauge on hood from the nos setup
i have 6a box just sold my timing box msd 8782
going with the $200 you picked mw
thank you