ok here is the list.....compression for both setups is around 9.5:1

Pro lightning 200cc cast iron heads
Comp cams 274* extreme energy cam
Comp cams 1.6 magnum rockers
edelbrock rpm intake
holley 700cfm double pumper carb...

Or here is the other one..

Edelbrock aluminum 170cc heads
Comp cams 274* extreme energy cam
Comp cams 1.6 magnum rockers
Edelbrock RPM intake
Holley 700cfm double pumper carb..

Which one would make more power?????I originally had put a weiand 142 blower on this motor but something in it locked up for no reason so I shipped it back to summit for my refund like I was told to do by weiand service department. So now I am gonna have that money to buy N/A stuff....I want to have atleast 400hp at the flywheel but more is acceptable...

 

I woudl go with the Edelbrock heads, but try to get the compression up over 10:1. Aim for between 10.2 and 10.5:1.

 

If the edelbrock heads are ETecs then get them but if they are not just get some modified Vortec heads from summit. My car pulls 330 RWHP at 5400 feet with stock vortec heads. Don't ask me how it just does, unless this guy's dyno is broken. All motor too.

 

No the edelbrock heads are just the regular ones...My goal was to try and keep it at 87 octane freindly...cause this is my daily driver and with gas prices like they are 93 is ridiculous..

 

The fast burn chamber of the Vortec/E-Tec heads allows you run less ignition timing and make max power. You could easily build a 87 octane engine with cast iron vortecs that would make 400 HP. THey did it in Chevy High performance, It's was called Agent 87. It only had like 9 to 1 compression with the XE268H cam and D-dished pistons.

 

only problem is that my engine now has 9:1 compression with 76cc combustion chambers...and the vortecs have 64cc chambers and I think my compression goes up to 10.2 or 10.3:1

 

With aluminum heads that's where you'd want it to be.

 

Go with some Pro Lightining Aluminum heads. They will flow better, have a fast burn chamber design, and the same thermal properties as the edelbrock aluminum heads.

 

I would recommend avoiding Pro Topline for the moment, until they get their problem of continued existence sorted out. Few things in life suck as bad as having the mfr of a major component disappear.

 

Yes, the E-Tec's are perfect for you. Edelbrock's crate engine with E-Tecs and a Hyd/roller cam makes 435 hp.

If it matters I have flat top pistons on my 355 with Vortec heads and I suspect the motor has 10.3 to 1 compression(don't know how thick my heads gaskets are, stock) and I can run 88 octane in it with full agressive timing. (36* total @ 3200 rpm) I run 15* vacuum advance at 15 in HG no probs, NO pings. the vortec design swirls the incoming charge and has a big resistance to detonation. With aluminum heads i would want my comp ratio to be close to 11 to 1.

 

so your saying you run fine on 88 octane with cast iron vortecs and 10.3 compression...if thats so I would rather have some cast iron vortec heads...

 

Yep that's what I am saying. The motor runs strong on 88 octane. I am at 5500 feet and I have heard that has something to do with why I can run so much compression. I also never let the engine get hotter than 200 degrees. You could still prolly do it because Vortec's like only about 32-34 total timing but since I am at 5500 feet I need to dump more timing into it for optimum power. I went down to 3000 feet one time and the motor still ran fine and it was unbelievably quicker than it is here. the XE 268 H has enough overlap to run 10 to 1 and not get pinging. I had that cam too and thye motor was still pretty quick but nothing compared to my HOT cam. I have heard good things about the XE 274 H too, PM me and I can help you do this on a budget, I built my whole motor from oil pan to carb for around 3000.

 

so is that your 1/4 mile time with that setup? If so that is a real good time..I want to be able to hit around 12.5 times...my engine has been rebuilt with in the last 2500 miles so its strong its got hyper pistons. I have hedman 1 5/8" long tube headers with true duals so the exhuast is set up for more power, I have msd 6 box with with 8.5mm wires, Accel distributor, super coil, cap, and rotor so I am good with the ignition as it stands. I have my holley 700cfm double pumper sitting in my garage with a 14x3 air cleaner ready to go.....this is only going to happen if I get a refund on my blower like I requested but they might just ship me a new blower instead and if they do that I guess I will deal with that...thanks for you help guys.

 

alright so around 10.3:1 comp with the vortecs will run good on lower octane like say 89??? Summit is refunding my money today or tommorrow so I need to be completely sure what I am gonna order.

 

The Vortechs will need a large split to the exhaust on the cam. The intake outflows the exhaust by a large amount on them. (Around 65% intake to exhaust ratio) A dual pattern cam is best on them, or some port work on the exhaust side.

Charlie

 

I plan on running a comp cam extreme energy 274* cam hydraulic flat tappet cam...

 

That is quiet a bit of cam for a stock set of vortec heads.

I would get the e-tecs if it was me. I really want a set of the 170cc e-tecs but I have to get my suspension setup first...then I may start saving.

 

From what I have heard about vortec heads they flow best around .500 lift...now this is only what i have heard...and that cams lifts are intake.487 and exhuast.490

 

or are you referring to the valve springs if so these are the upgraded versions..

 

Flow best at .500ish on the intake side and flow best at .600ish on the exaust w/ pipes.

 

oh ok thanks I am still really unsure about my choice here.