Blown GTA

The two choices are:
1) ZZ-9 Cam or
2) Comp Cam 305 220/230 .510/.510 @.050

Engine is being stroked to a 383 and here's what is in the shortblock assembly now:

TRW Forged Flat top 9.5:1 74cc heads
5.7 stadard rods and 3.750 Scat crank

Here's what I'm planning to do with this motor:
1)Add AFR 190 heads w/74cc to lower C.R.
2)Transplant my current Edelbrock lower Superam upper intake w/ 52mm T.b.
3)ATI Pro-Charger purchase undecided to go with the P-1SC or D-1SC. Boost 9-12lbs intially or how safely the TRW/Scat crank/GM rods can take.

Concern from a member at another board was that the Comp Cam 305 was a dog under 3000rpm and when running boost it pays to go milder however I think his experience was with a 350 LT-1 blown car. What are your thoughts?

P.S. I have a built 700R4 with 10" custom 2200 stall converter from Continental and a Currie 9" Ford Rear with 3.50 gears. HSCLT headers (1.75) Mufflex 4" back



[This message has been edited by Blown GTA (edited February 11, 2001).]

IrocStan

You might want to go custom. With a blower the big thing that you need to look at when choosing a cam is the lobe separation angle. You'll probably want a LSA around 114+ to keep the intake gases from blowing right out of the exhaust before combustion. I know that Comp Cams can make you a custom cam. You could choose one of their current lobe designs then have them custom grind the cam with a higher lobe separation angle. I like the Xtreme line that they have. I'd look at the 218/224 or the 224/230 if I was you. I have the 218/224 w/ .495/503 lift 112LSA that I plan on putting it in the engine that I will be building over the course of the next year.

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87 IROC 350
Mods: 3:42 Torsen, pocket ported 083 heads, complete Edelbrock exhaust, Most free mods, Most little mods, aluminum d/s. Edelbrock STB, boxed rear suspension pieces, urethane bushings everywhere.
Stock cam, chip, runners, base, and trans
13.94@103mph, 2.25 60'
Recent stuff: SSM sfc's, Homemade relocation brackets, Ported SLP runners, ported base, EGR!
Current/future projects: homemade torque arm, and 27x10 Hoosiers (need wheels!), and Prom Burning
Planning new engine build, possibly 383 w/ TFS 23*

The ODB

Definately go for the lower duration cam. Swapping to a hydraulic roller version would also be a big improvement as it gives you more lift with less overlap.
ODB

TRAXION

I agree pretty much with what was already said. Generally speaking you want to go with a looser LSA and more exhaust duration. I too would suggest a custom CC grind. Check out the camshafts that MAFB call the 'Randy Cam' or the 'Jody Cam'.

Randy Cam = 218/230 at 114LSA
Jody Cam = 224/230 at 114LSA

The Jody cam is currently installed on a 383LT1 running the D1. Darn good cam. However, I would suggest possibly a new cam called the 'BlownGTA' cam

BlownGTA = 224/236 at 114LSA

You may need to upgrade the stall on your converter though.

Tim

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• Program your own PROMs!. Read my article to get started!
• Research and Experiment before asking questions.
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TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
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Blown GTA

Here's the dilemma. The stroker shortblock is one labeled "budget" by a shop here in Cali called Morgan Motorsports and he is using overstock or used parts in his shop. I have lay down a 500 deposit and originally it was going to be built with a used ZZ-9 cam but he also say I could choose the CC305cam that one of his customers rejected for a bigger cam. BTW that cam has a 114*LSA.

Heres my questions:

If I decide to put together a naturally aspirated (all engine) combination with AFR heads and Superam intake which cam should I choose?

How about with an ATI prochager kit?

Or which cam would perform well given an N/A or Forced inducted engine?

Blown GTA

Here's why I picked the CC305 cam over the ZZ-9 cam for my 383 shortblock assembly.

Tell me if my generalizations are totally accurate, almost accurate, somewhat accurate, or not accurate at all.


1)219/219 Lingenfelter cam is well matched for the Superam so with 220 intake duration I would run right with my superam correct?

2)AFR heads stop flowing over .5 lift so you don't need the high lift cams for these heads unless their fully ported correct?

3)All SBC heads(aftermarket or stock) in a Naturally aspirated engine would benefit from a split duration cam since exhaust flow generally needs help.(LPE heads except)

4)With 114* LSA and such a wide split duration cam on the exhaust lobe (230) this cam would run well in a blower/nitrous combination
correct?

5)So where would I benefit by picking the ZZ-9 cam over the Comp Cam 305 one?

[This message has been edited by Blown GTA (edited February 13, 2001).]

The ODB

I'd say give more than one camshaft a shot and see what you like best. Many times the milder version will perform much better in both N/A and boosted engines.
Good luck
ODB

Kevin91Z

iTrader: (1)

I wouldnt worry about it with Mike Morgan. He and Derek have been around for a while and have great experience dealing with TPI cars. Which cam do they recommend? I was going to purchase that 383 and ZZ9 cam at one time but I went a different direction with my setup. Your car should be a screamer when its done. Hurry up and finish by May so you can sign up for the West Coast Shootout.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

blowen90ta

to stray a little off topic--just wanted to say don't lower the cr you will not gain anything i'mm running less boost i know 6-7 psi but my afr's were milled to raise my cr to 10-1 and let the aluminum dissipate the heat and they work great on or off the boost and mine runs on 92 no problem all day

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1990 Trans Am,350 TPI(L98),WS6suspension ,bridgestone RE71's /245/45/zr16
paxton supercharger,afr heads, alston sfc's,msd 6AL-BTM,
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