Hey guys. I have a set of Performer RPM heads on my .040 over 350 with about 10.3:1 CR. I also have a Crane Fireball hydraulic flat tappet cam, 224/234 duration at .050, .496/.520 lift and 114 lsa. I have a Comp Solid Roller XE280 cam, 242/248 duration, .576 lift and 110 lsa. Over my current combo, this cam is a roller step up and its solid. But I was thinking about upgrading my cylinder heads to Dart Iron 230cc ones, but am afraid they might be a bit too big for the 358. What do you guys think the motor would react like with these heads and the comp cam. Reason why I want 230 ccs is 'cause I am going to build a 406 short block by spring and want to use those heads on it. What do you guys think, go 215 cc runners maybe? I think Performer RPM is 170cc, not sure. Thanks guys!

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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

 

Sounds sweet to me! Let us know how it turns out man. Sounds like a serius bracket engine to me. I just hope your bottom end pieces are ready for 7000 RPM later man

Denny

 

I think that the Dart 230 cc heads start to shine at 4500 rpm and above, and really need more than .600 lift to use the bigger flow numbers. I just ordered the 230 CC heads to replace my 215 CC's because I swapped cams-one that has 670 lift etc-there was a 85 HP difference between the 215 & 230's. No other changes.

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90 IROC,394 ci,vortech,Tremec TKO,9",NX 150 HP shot (just in case),Hotchkis,Spohn,roll bar,etc
my pics
IROC burnout
<A HREF="http://temp.corvetteforum.net/c5/iaz06//iroc_racey_idle_1000_rpm.mpg" TARGET=_blank>
IROC @idle </A>
my M5
Z06 hot lap
IROC dyno
IROC @ TWS
TWS II clip
IROC BHFMS clip

 

85 HP? Are you serious??

What was your old HP peak and what is your new peak? just curious

Denny
www.denny.cz28.com

 

You're going to need a pretty big cam. Probably going to want a built motor too since you're going to be reving really high. And make sure your tranny is up to it! You will need a very good tranny cooler . Might want to consider drilling a hole in your tranny so you can put a little 1/8" heat sensor in there and see what kind of temps your tranny is at so that you can keep it in good shape .

At the very least have the block and rotating assembly balanced by a respectable shop. I'm sure you're probably already running forged pistons. I dunno man, if I were you I'd go for some AFR's instead... they flow better at all RPMs. Just my 2 cents .

[This message has been edited by Yellowknifer (edited June 16, 2002).]

 

Here are the results-the only AFR heads that outflow the dart 230 cc are their 227 CC competition heads-pricey at $2k. Here are the results from Dyno 2K using actual flow numbers from each head. Engine is a solid roller 393 CI with 10 lbs. boost. Lift is .658I and .667E. Right now I have the Dart 215 CC aluminum & swapping 230 CC's.

HP TQE

Dart 18 degree 842 608
AFR 227 CC CNC Competition 779 596
ProLightning 235CC Iron 773 596
Edelbrock Victor Race 757 588
DartPro1 alum 230 CC 743 584
Trick Flow R series 733 585
AFR 210 CC Aluminum 719 573
Brodix Track 1-CNC 717 583
BrodixTrack 1-out of the box 710 580
DartPro 1 alum 2.05/1.60 215 cc 658 565






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90 IROC,394 ci,vortech,Tremec TKO,9",NX 150 HP shot (just in case),Hotchkis,Spohn,roll bar,etc
my pics
IROC burnout
<A HREF="http://temp.corvetteforum.net/c5/iaz06//iroc_racey_idle_1000_rpm.mpg" TARGET=_blank>
IROC @idle </A>
my M5
Z06 hot lap
IROC dyno
IROC @ TWS
TWS II clip
IROC BHFMS clip

 

hey there Igor. sounds like your plannin on making some power soon huh?

that big of a head on a "small" 358ci eng. would be a dog on the street. but if you know your going to make the bigger eng., then Id go ahead and get them. esp. if your willing to get a bigger cam to try to match the heads. seriously, that is a very big port. you'll also need much \bigger rear gears then 3:27's too.

what you planning on doin w/the edelbrocks? seling cheap? email me is so. chris

 

Well, I got a core 400, but for now I am just going to put the roller cam into my 358, and then in the winter go with a 400 buildup and pick some heads then. I'll keep it in mind though if you are still interested then.

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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