Thanks Bill. The Merlin online catalog lists "stock exhaust location" for all of their heads. Hopefully, they're not lying :lol:

-Joe

 

Geez, those AFR heads sure do flow! You can buy the "fully CNC ported" 357cc version ready to run for $2599, and the flow numbers are unreal. I plugged their flow numbers into the engine I've been toying with in DD2000, and peak horsepower jumped from 655 to 739!!! I know it's BS, since no way my intake etc. would support that, but it's still impressive for the price. The program doesn't show any reduction in torque at 2000 rpms either. More proof of Jim's big head 540 philosophy.

 

Curtis (mountainmotor), Doug at Holley had some info to offer about that Holley manifold. You can read it here: http://forums.chevytalk.com/forums/F...ML/000279.html

 

Interesting.Would you post the part # of your manifold? :)

I have my doubts that that kind of power was made in the RPM range you are looking for or with 950 cfm FI suggesting a possible mismatch of components



[Modified by mountainmotor, 7:39 AM 1/8/2002]

 

Part #9901-201 http://www.holley.com/HiOctn/ProdLin.../C950MPIA.html

They also have a dominator flanged version which shares the same port sizes. Do you think I should look at the dominator flanged version with their 2000 cfm at 3" throttle body?

There is more new information about this manifold at the chevytalk link: http://forums.chevytalk.com/forums/F...ML/000279.html


[Modified by Flareside, 9:58 AM 1/8/2002]

 

Well I want to be the first to tell you I know little about the FI System you want to use.Maybe Monty would be of better help there.But if CFM of FI = CFM of carb it still looks to be that you would be in good shape with the Edelbrock 454R with a little more cam than you ran the tests on Dyno 2000 for what you have implied concerning the 5kRPM.
Look at what 427 HotRod has accomplished with two radically different sets of heads.The Dominator on top of oval ports worked well with 427ci. He has given good guidlines from his experience to work with in the above posts.Mark also said it well about the overcamming and too big of a set of heads.If it were not for the not wanting to spin it up part and the 950 cfm FI of this equation I would say put 345's and a Dominator on it and go because "killing" bottom end on a 540 would be a little hard although not impossible with your 5spd.The only thing I can come up with now is a cam somewhat like I mentioned above to mechanically give that big a motor more time to induct from the CFM you have chosen and a middle of the road head that will keep good velocity for your intended application. As far as the 2000 cfm can it not be managed Air to fuel ratio wise by computer? The reason I ask is that I don't have problems with out of the box dual 1150,s on a 540 as far as throttle response goes.So there we go again.Big motors need big CFM. :) A 830cfm Holley can work well on a HOT 355 ci.

Now it seems the intake runner size of the manifold needs to be looked into and exactly what intake gasket it uses.


[Modified by mountainmotor, 12:42 PM 1/8/2002]

 

We'll, if it's not already painfully obvious, I'm not going to be able to stick to my 5000 rpm plan. It would cost just as much as a more powerful engine, it would have too much low end torque for street tires, and it won't have much room to grow with the small port heads, smaller injectors, etc.

These things sure can snowball! 6500 seems more rational every day :D

 

Try GM Performance parts. They sell aluminum rect. port heads (Edelbrocks, I believe) with 2.25 S/S intakes- they sell for around $1700 complete!
:chevy :chevy