First, here is my motors' specs.
502 honed .004 0ver to 4.47 bore
SRP 17cc dome 10.2 to 1 Pistons
zero deck
Clay Smith solid flat tappet 304 Adv. 258 at .050 .615 lift on a 108 LSA installed on a 105.25 I.C.
Jesel shaft rockers 1.8 intake and 1.7 exhaust
AFR 315 CNC heads 121 cc chambers
Holley Strip Dominator Intake
950 HP carb
Eagle +.250 H-beam rods with the L19 rod bolts
GM forged crank, internal balance and knife edged
Compression ratio came right in at 10 to 1. I wanted to go a little higher but was talked out of it.

I am going off of memory here as I will pick up the motor Monday and the dyno sheets, but the best pull with my carb was 605 at 6300rpm and 586 lb ft at 4900 I believe although the curve was really flat with 500 lbs as low as 2500 I believe. Just for the hell of it we threw a 1050 Dominator on it and it picked up 15 and 15. One interesting thing was when he tried his standard dyno 800 cfm holley that he knows runs good and has been blueprinted, it equalled the best we pulled out of my carb so he thinks the 950 hp is just an 830 or so given the 850 baseplate and 750 main body. His dyno is by his own admission very conservative but very accurate in repeatability. All pulls were made at 200 degree oil temps and 180 water temps. I bought a Victor Junior but realized quickly it would not fit so I sent it back without running it although I would have liked to. The back measured the same as the Strip Dominator but was too high in the front. He was very complimentary of the AFR heads and thinks it is the best out of the box head going right now and he has done many big blocks. He said this engine should be plenty to scare me with for a long time. I can't say enough about how great this man was to deal with and how impressive his track record and his facility are. If anyone needs work in the New York Tri-state area I highly recommend this guy. His name is Bill Carlquist at Carlquist Competition Engines in Oakville CT. I will post some charts and some exhaust testing results we did when I get the sheets. Joe (Flareside) this was for you buddy. Bill.

 

Very impressive numbers. Those would keep me satisfied for a little while. Enjoy. :thumbs:

 

You better be scared with that kind of power. :)

Yes, I have info from a Holley insider that the 950 HP really flows in the 830 range, just like the dyno guy said. Still a good carb, though, even if it doesn't flow the advertised numbers.

 

Didn't your engine guy guess 600 before you ran it? He must really know his dyno! Sounds like he did a great job.

You better get busy installing that monster this week. Everybody at the Mahwah show will be looking for you next Sunday. :D

 

I'm assuming you're using headers. My understanding is that the 305 and the 315 AFR heads have a 3/8'' raised exaust port. I'm about to purchase a set of 305s for my 427 project. My question is if you have encountered any exaust interference problems with this?

 

Where in Oakville is he? I may want to stop in and talk to him about future projects.
Thanks
Gary

 

Bill,

Those are great numbers! I will be VERY interested to see your chassis dyno figures as well.

iree75... I did not have a problem with mine and I run Hooker side-mount headers. Several tubes had to be slightly dimpled to allow access to spark plug holes. Otherwise, no problems. The ports are .300" raised, and I had my heads angle-milled to increase CR a bit, so mine were effectively ~.200" raised.

Just the base 305 heads picked me up 100rwhp over the stock rect. port heads on my 454 HO (also installed a hi-rise intake and slighly bigger cam...although its awfully small).

 

<<iree75... I did not have a problem with mine and I run Hooker side-mount headers. Several tubes had to be slightly dimpled to allow access to spark plug holes. Otherwise, no problems. The ports are .300" raised, and I had my heads angle-milled to increase CR a bit, so mine were effectively ~.200" raised.>>

<<Just the base 305 heads picked me up 100rwhp over the stock rect. port heads on my 454 HO (also installed a hi-rise intake and slighly bigger cam...although its awfully small).>>

That is good. AFR said it shouldn't be a proplem, but just wanted to hear from someone who'd done it. Thanks
-Frank

 

Wes,

Do you really think there is that much difference from the factory rectangular heads? I can hardly believe I would have made nearly 600rwhp with that change alone. It is something for me to think about.

69ttop502's numbers are very impressive. It will be very interesting to see what numbers it makes at the rear wheels. The forum is great cataloguing a rather extensive dyno reference library.

Chuck



[Modified by Chuck Harmon, 8:29 PM 10/19/2003]

 

Iree, I am preparing for the worst as far as headers go. I have a freshly coated set of Hooker Sidemounts ready to go in and I am praying that they will fit, otherwise I may just bite the bullet and get a set made and sell mine rather than butchering them up. Gary, Carlquist is only 5 minutes off of I-84. You go to Waterbury and north on Route 8 to the first exit and continue 2 miles to Falls ave. and make a right and he is 1/4 mile on the right. He will spend 2 hours talking to you if thats what it takes, really great guy to deal with. Joe, you're right he did guess 600, I guess he knows his stuff. I will definitely stop by Mahwah Sunday so I hope I see you there. Is it still at the College?

 

Bill, it's at the Sheraton Crossroads now. Hotel website




[Modified by Flareside, 1:01 PM 10/20/2003]

 

I know exactly where he is now, I use a welding shop across the street- McGee welding. How did you find him?
Gary

 

Bill. GREAT numbers............. Buy new seatbelts. Your going to fly. JCL :yesnod: :yesnod: :yesnod:

 

Chuck,

Given the fact it picked up TQ and HP across the entire rev-range, I'd have to say it's definitely the heads (more flow with a smaller runner which = more port velocity). The other combo was completely maxxed out. Perfect A/F ratio (13.0:1) at WOT (334rwhp/384rwtq). This combo isn't, and it still picked up 100rwhp. It runs fine, so I didn't bother leaning it out...it boils the tires anyway, and plus it was during the summer. I would venture now that its cooler, even with no jet change (since it was rich 11.5:1 during the summer tune) I am ~450rwhp or so. Maybe more.

All this with low CR (9.5:1), and a relatively tiny cam for a "hot-rod" motor. Chances are good had I gone with the bigger hyd. roller AFR suggested (242/242, .615" lift), I'd be withing sniffing distance of you. :)

I don't know how these compare to your heads, but you have really good GM factory heads. Mine were plain-Jane, iron rect. port, box stock.

Also, realize that I am making peak HP at only 5600rpm (I shift ~6000). With the bigger cam to bump the peak rpm up to ~6200+, I honestly think 470+rwhp would be what it would see. But, I don't plan to mess with it right now. I'm just enjoying the heck out of the car, especially in this fall weather. :D

I think its a testament to the head design that I have power from off-idle to "whenever I shift". TQ anywhere, which is a function of engine power as I only have 3.36s in the rear. There is no point at which the "cam comes on" and starts to make power. It makes power _everywhere_. With a low CR motor like I have, I'd say its primarily the heads. Yes, I'm still running a dual-plane, but I was before, too.

 

:cheers: :cheers: :cheers:

 

Are you going to be able to handle 600 hp in a vette? :eek: Things happen very fast at that level. Your talking about pull the front tire power, easily. Good luck on your quest.

 

:cheers: :cheers:

 

Gary, I actually found him over on the Chevelle forum. There was a thread over there raving about him and that very same day I called him and talked to him, loaded up the truck with my stuff and was off and running.

Jim, thanks, gonna but those baffles to good use now.

Budman, hopefully I am ready for it. I have beefed up the driveline with the 30 spline axles and beefy halfshafts with 1480 u-joints. Also put in a new suspension and steering components so outside of taking the body off I have done all I can do. Thanks everyone, Bill.

Joe, I will see you on Sunday, where can I find you as I assume your car won't be there?

 

Bill, my car will be there. I'll be with a few other guys from the C3 forum. Check out http://forums.corvetteforum.com/zerothread?id=657927