Hey guys. Well, I need to make up 1/2 second or so, all on motor. My traction is good, my gears I am not changing for now (I can still drive on the freeway like this). Here is the basic motor now:

358 SBC Roller Block, Crane Blazer flat tappet 224/234 duration, .496/.520 lift and 114 lsa. Heads are out of the box Edelbrock Performer RPM, Performer RPM intake and 750 carb. Headers are 1 5/8" primaries. Compression is a healty 10.3:1.

I have a Comp Cams Solid Roller ready to install, XE 280, 242/248 duration, .560/.575 lift (or so) and 110 lsa. I will be stepping up from flat tappet to roller and from hydraulic to solid, but I don't know if it'll be enough to make up that 1/2 second. What more can I do for a reasonable cost to get more power. Can those Performer RPMs be ported (by myself) some to make more power? What about crank scrapers or something like that, 5 hp here and there. I am thinking of getting a pick-your-part hood and cutting a hole it in so I can run a decent air filter and get some cold air in there for when I go to the track. Also might try a carb spacer then, might help a bit with heat too!

Tranny is th350 with 10" converter, gears are 3.27, running 28" tall street tires (too tall, but all I had, hooked well though).

Help guys, I need to go this fast to beat a friend :-). Thanks.

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1981 Olds Delta 88 455/th400/3.23 posi

1988 Trans Am WS6, 355/T5/3.27 posi; RPM heads and Intake; Crane Fireball cam; Holley 750 carb; soon Comp RXE294H; th350 & 10" converter.

1994 Trans Am LT1/T56, no cat; Hooker CB; Hotch. SFC and STB; Ripper shifter; Poly mount; Lakewood LCA; K&N FIPK; Hypertech Airfoil; soon to port&polish MAF; Sprint springs & Bilstein shocks; GM Motive 4.10; Hypertech PowerTuner III

 

that cam is going to make a he!! of a change in your motor!!!
You should definately look into opening up the heads some, and maybe swap to a victor jr intake and 1 3/4" headers to open up the top end. Don't know what this'll do to your freeway driving, though.

before you run that cam, make sure you've got the valvesprings for it, though. And don't forget a 'button' for the cam nose to keep it from 'walking'.

 

Hopefully the change will be for the good!!! I don't know if I can afford to upgrade the exhaust now! Its a PITA in a third gen anyhow, right now I have 1 5/8" shorties and single 3" with a 3" Hooker muffler. I would consider running these headers, but some kind of a short dual exhaust with just some mufflers that will pass for "muffeled exhaust" 'cause at the local track there is NO open exhaust past 10 o'clock so I could make maybe 1 or 2 passes like that.

 

And also, since this is a roller block, I do have the stock cam button that bolts in with the two allen keys I belive. Is this sufficent, or do I need a aftermaket one. And also, do I need a different timing chain? Thanks.

 

The biggest gain for your buck right now would be to go to a true duel exughst. the restriction of a 3" single is massive.even a 21/2" would help if its a duel system. also what carb are you running?

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Steve
69 Camaro 355ci, Dart Pro-1's, Flowed by CFM. Solid Roller 6" rods 13.2-1 Comp Turbo350 Trans 4700 stall.4:88 gears 29" Slicks or MH RaceMasters on the street

 

I have a 750 Holley vac, but the linkage is tacked so it kicks on automatically when you go to WOT. I know the exhaust sucks, but the car was lowered. I don't know how I will fit a dual system on a third gen.

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1981 Olds Delta 88 455/th400/3.23 posi

1988 Trans Am WS6, 355/T5/3.27 posi; RPM heads and Intake; Crane Fireball cam; Holley 750 carb; soon Comp RXE294H; th350 & 10" converter.

1994 Trans Am LT1/T56, no cat; Hooker CB; Hotch. SFC and STB; Ripper shifter; Poly mount; Lakewood LCA; K&N FIPK; Hypertech Airfoil; soon to port&polish MAF; Sprint springs & Bilstein shocks; GM Motive 4.10; Hypertech PowerTuner III

 

With that new cam it shoule pick up some MPH easlily. What is that converter you have stalling to? You might want to bump that up to the 3600 mark as well.


p.s. How has the Calgary track been on Friday nights? I havn't had a chance to get there this year yet.

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1997 Z28 A4 3:73's
1971 SS Restoration
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Bests
60'-1.82 (ET's)
1/4-12.28 (Radials)
MPH-119 (Radials)

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whoops, missed that the first time. Yes, that's the best way to keep the cam in controll...

 

Track has been good in a sence that stuff does not brake (like the tree or the traps), but otherwise it has been ok. The converter I can foot brake to high 2000ish, if I had slicks might be able to get that slightly higher. It is a 10"

 

You should do a little pocket port/bowl blend on those heads. I would vote for a super victor intake for that cam. It holds it's own below 4500rpm and will just kill the rpm above 5000, which is where that cam will makes it's power. Your exhaust isn't ideal, but is sufficient. More stall will be neccesary to pick up what your looking for...I'd say minimum 3500 stall.

Good luck.

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-Joe
79' Z28 4-spd
http://joesmith59.freeservers.com/
*Boycott Lapeer*

 

the 242 degree@.050" cam isnt gonna like the 3.27 gears. you have to be geared to take advantage of the power band that your motor has in order to go faster. There is a very good chance your car will et slower with the new cam.

Id recomend either less cam or more gear.

what rpm and speed do you cross the finish line at in the 1/4 ?

DJ

 

Just shifting out of third. I shift at 6000 RPM. It might not ET slower though, but I agree with the gear, it really needs 4.10s

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1981 Olds Delta 88 455/th400/3.23 posi

1988 Trans Am WS6, 355/T5/3.27 posi; RPM heads and Intake; Crane Fireball cam; Holley 750 carb; soon Comp RXE294H; th350 & 10" converter.

1994 Trans Am LT1/T56, no cat; Hooker CB; Hotch. SFC and STB; Ripper shifter; Poly mount; Lakewood LCA; K&N FIPK; Hypertech Airfoil; soon to port&polish MAF; Sprint springs & Bilstein shocks; GM Motive 4.10; Hypertech PowerTuner III

 

Why not bite the bullet and change the gears?
1/2 second is substantial.I would go to 3.73
or 4.10.It's probably lots cheaper than the
engine work and will make the change you're
looking for.

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well it sounds like you are set on swapping in that cam . Im sticking to my original comments, :') you have a very mismatched combination of parts, why not add a tunnel ram to it while your at it :')

please post your current et and mph so we can compare it to your et's with the new roller cam.

dj

 

Well, my original combo this motor was built for was a 2.95 first gear T5 with 4.10s I had (the rear that is in my '94 now). The motor was VERY well matched to the car then, went 172 mph at 6100 RPM in 5th (.61 OD) and the acceleration was 1/2 quicker. It was great, but 5 T5s later I got sick of it. With 4.10s and th350 I can only drive the car to the local 7-11, doing 50 mph at redline. What I am trying to say, in order for me to go to 4.10s, I have to give up driving that car 60 miles each day on the highway like I do 'cause it'll rev at 4500RPM + and that is unaceptable. I think I am just going to get rid of that car (put the 305 back in) and keep my motor and use the money to work on the LT1 as it has a T56 and 4.10s which are very nice combo and the tranny does not explode!

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1981 Olds Delta 88 455/th400/3.23 posi

1988 Trans Am WS6, 355/T5/3.27 posi; RPM heads and Intake; Crane Fireball cam; Holley 750 carb; soon Comp RXE294H; th350 & 10" converter.

1994 Trans Am LT1/T56, no cat; Hooker CB; Hotch. SFC and STB; Ripper shifter; Poly mount; Lakewood LCA; K&N FIPK; Hypertech Airfoil; soon to port&polish MAF; Sprint springs & Bilstein shocks; GM Motive 4.10; Hypertech PowerTuner III