W2's vs. Edelbrock RPM

[nivvy]

IN terms of usefull airflow, the intake valve can be not larger than 51% if the bore its feeding, before shrouding becomes such an issue that the flow will simply not improve.

we ran 2.25 intakes on a 4.375 bore indy headed 499 motor .690 lift solid roller .... 8.80's 

[71chally416]

Ever see a modern Nascar head? Those engines make 850hp from 358ci, or 2.37 hp per cube (like a N/A 1,042hp 440..) They have Intake valves over 2.17" 

   

[nivvy]

Its amazing how small block technology is way better than big block stuff ....

[71chally416]

Mettler's PST Dakota is another with an amazing engine. It makes 985hp from a similar sized 358ci motor (2.75hp per ci) It does 7.30's at over 180. Nothing like making the cover of ND after bagging a Wally in Comp Eliminator with a truck.

 

[go-fish]

Yes, but those are P series blocks. Not alot in common with those and LA's. Ever priced W-9 heads too?

[moper]

This is a link to a site I've been a member of for a few years now. These guys are the best at what they do. This link includes a post of two from Darin Morgan, for years he was cheif cylinder head guy for a little known shop called Reher Morrison. I think if you plug in bore size numbers for those 358" CUP car engines, or the 358 Mopar sprint car entires, you'll find the valve are sized at 51-53% of bore size. I dont go over 51%. It's all about the bore size. But the truth is, if they ran well, they would run better with smaller intake valves. Period. 

http://speedtalk.com/forum/viewtopic.php?t=5623&highlight=intake+valve+shrouding

PS, these guys KNOW heads and theory. 

[71chally416]

So according to them, a .030" over 340 bore (like mine) with a 4.07 bore would require 2.075" Intake valves to be at 51%, and an .030" over 440 with a 4.35" bore should have 2.218" Intake valves, not the inadequate 2.08's and 2.02's (or 1.88's) they have, and the ports and port volume to go along with it. Thanks for making my point.

 

[nivvy]

Yes, but those are P series blocks. Not alot in common with those and LA's. Ever priced W-9 heads too?

its $7500 just for the port work on W8's .... nothing else.....   

[nivvy]

So according to them, a .030" over 340 bore (like mine) with a 4.07 bore would require 2.075" Intake valves to be at 51%, and an .030" over 440 with a 4.35" bore should have 2.218" Intake valves, not the inadequate 2.08's and 2.02's (or 1.88's) they have, and the ports and port volume to go along with it. Thanks for making my point.

 

I wa thinking of having a 2.25 put in my new indy heads for the challenger.. 4.375 bore.... 

[71chally416]

On a 340 motor the W-8's need no porting.
http://www.moparmusclemagazine.com/techarticles/engine/155_0310_340_engine_600_hp/index.html

[moper]

I guess then I blew it using big 2.02" valves with my 12 second 109+mph 7.9 to 1 compression 318 that had a .470" lift cam and a stock convertor. I should have used smaller Intake valves. Oh, that's right, I had the stock 1.88 valves in the smogger 340 heads I had on it when it was doing 13.50's with everything else the same...   

When were we talking about the 4.07 engine? I thought we were talking about the above quoted deal? 3.94 x 51% = 2.00? 

I'll agree to disagree...This is going nowhere....lol

[71chally416]

I just used what I had available. They were a set of '70 340 heads with 2.02" valves. I really never lost a second of sleep worrying that they were too big and I was very happy with the .5 ET gain. 

[Ck[FIN]]

Hi all mopar guys. I had to register because i found a lot good topics from this forum.
I bought Edel Heads for my 360 last winter and i checked them. Everything else was okay but the oiling hole wasnt drilled through, glad i noticed it before motor assembly. Could have been dry rockers otherwise.
I built mild blower motor for my 1965 valiant 9:1 comp, probe pistons, edel heads, mp 284 cam, and it produced 520hp/516TQ at very low boost (9psi). It ran 10.6s/ 1/4mile. 
Picture of it.
http://varpunen.sigmatic.fi/~ck/kone.JPG

Now i bought a motor from my friend, he built it 8 years ago and raced it for a year. it has W2 fully ported by Grottis, 2.10intake/1.88exh. 15:1 comp with huge cam. 0.707lift 1.7rockers. It made 750hp/575TQ. Its 350cid. He said those heads can make over 800hp but this is enough for you. 
Well, they are very expensive, everything is custom fit for this engine.

BTW: Rockers are made in Finland, Looks like jesel and Harland sharp mix, Looks like in this dark country with very long winter everything can be made. 
Rockers: http://kuvablogi.com/nayta/1509587/

sry for my bad english

-Sauli

[71chally416]

Cool stuff! Look at the ports in THESE heads!
http://kuvablogi.com/nayta/1509588/

[Ck[FIN]]

I have more pictures of those heads, but they are not in the internet yet. The intake ports are big and raised alot. Even the surface of the valve cover is raised because of the intake port.

-Sauli