He is at Toms now and still hooking things up.

I would recommend baseline pulls with the 4150, however not miss the opportunity to test the 4500’s against that baseline. In my experience, the majority of this displacement area/stroke always makes more power with carburetors of greater capability than the calculated need shows. Keep your eye on the fuel curve (BSFC) numbers and the torque. If the TQ figure shows good specific output @ peak and begins to flatline in the high 5XXX and low 6XXX that is an indicator of decaying plenum pressure and increasing pumping losses. Vacuum is an indicator but you will need to watch SCFM and fuel closely.

Bob

Dennis
Craig M (Wette Vette) has a very similar build to yours
(598/10.7 SCR/
vacuum pump/
Dart 355 and TR ported by Darin Morgan
camshaft similar to yours (pk power ~ 6500)
running in the upper 8XX HP range.

He has (2) 1050 Nickersons and I would consider that to be the absolute minimum for this application.

Bob

just got home but motor is still on the dyno. Need to order some parts it had a miss in it when you tried to hold a load on the motor.Tom is making some different header for it the ones he had were junk full of holes. But so far it made 827 at 6100 rpm will keep you posted

OK, I was 3 off. Dennis, was the miss under a load through out the RPM range or just up top? What's your magic number?

It is under a heavy load from 4000 rpm all the way to 6300 it does not do it till you hold it there for a second or two I was shooting for 850 hp

What were your AF ratio's? Make sure you don not go lean.

What did Tom think? I had been tracing some valvetrain issues myself on my 496's. Did your valve springs come from Bob also? Also what are you using for pushrods? I called Jim at 6:30 this morning. He was anticipating you getting a carb spacer to try. I am sure you'll achieve your goal. I'll bet your happy for the first session regardless. It can just be time consuming sometimes chasing that extra power that your certain is there. BUT WELL WORTH IT...

If you're looking to try a carb spacer of sorts I have a couple of NEW Super Suckers (or whatever you call them) for sale still in the box if you want to try them. I only live about 25-30 minutes away from Tom.

Thanks Kamma but I have 2 of the super suckers I was going to get one from jim but he didn't call and I didn't wan to be a pest and bother him so I bought one