Damnnnn, I've been looking at other dyno tests with that cam because I was thinking of replacing my XS290S with it, might need to order one! Those numbers would be impressive even if it was a 493.

Thanks !

And thanks to all that gave their input.

Mark

One thing I wanted to add that I thought was interesting, was the engine picked up a little power when we retarded the timing from 35* to 33*. We didn't go any further, and I am curious as to what would have been the result.

Mark

that's interesting because the 446 with victor heads that dwayne and bradh just dyno'd made more power as they increased ign advance.
wonder if it could be the cam events or if it could be the chamber mods that hughes did to the victor heads..

I read that too, and it's why I thought I would mention it. I thought that the more efficient the chamber, the less advance is needed ?

Mark

Can someone please explain why one engine likes less timing and another needs more ?

Thanks,
Mark

Years ago I found my 400/470 with E-heads liked 33* of timing on the chassis dyno. It would fall off 3-5HP 2* on either side of that.

davenc, I appreciate the info. I think we saw a little more than that. I don't have the exact figures. Nice example to compare with, that helps a lot.

Thanks,

Mark

Some times the timing light and the operator will see the timing different than you will see with your timing light, been there done that
Not every engine builder or hot rod mechanic will verify TDC exactly on the timing tab and balancer Never ASSUME anything, especially on race cars

I race with a guy that builds big engines and races a Top Dragster. He has a 669 that loves 25 degrees. He explained to me that the less timing a motor likes, the more efficient that motor is. My high compression 493 likes 34 degrees. I mean it HATES anything else.

I mean it HATES anything else. [/quote]
Not really, most BB Mopars, iron or aluminum heads, like 34 total the best that I have tuned and raced 35 or 36 degrees would run very close, if not exactly the same ET, so why run more than you need to get the best performance
I do remember one well known SS racer that had a 415 HP 426 M.W. 1963 Savoy that swore his motor liked 42 degrees total but he didn't build the motors. I found out later why he thought his motor like that amount of timing, a early timing cover used with a later model balancer You have to verify every little thing on race motors

Andy actually pulls timing out to calm down the launch for racing. Not much and not for long but still, starting at 25 degrees? We also learned the other side of that as well. The car wouldn't run pulling more than about 6 degrees out of it. That's pretty amazing if you ask me. I've heard of some other highly efficient N/A big engines that like no more than 28-30 as well. It's become my goal, big(ish) engine that likes 28 degrees!

Cab, I can say without a doubt that the tab on this engine is correct, with zero on the tab and balancer being tdc . It is something that I always check. The dyno shop that we used builds some high $ engines and do a lot of dyno work. I am confident we were @ 33* . We started @ 35* and then backed it down. I know my Hemi likes 32* .
Thanks,
Mark

This is what my understanding is as well. The more efficient the engine, the less timing advance is needed. Don't the Gen 3 Hemis run less timing ?

Thanks,
Mark

Nice build! That is about the same combo I have in my Challenger. 470, Eddy RPM heads, (I had Dwayne do a little porting on mine. I think around 293 cfm) RPM intake. Nyutten 750 carb. I'm running about the same cam specs in a mild hydraulic roller. I always thought this motor felt better then the 500 hp I was going for. Now I probably know why. I might try a Fitech in the spring.

I messaged Mark about this cam a while back and purchased one for my mild 440. That cam is the cat's ass..Has good power and pulls like a freight train.

Not surprised how well his 470 runs as you can see his meticulous detail on his Hemi Allstate..very good numbers!

Thanks Chris,
I appreciate the complement.
I am glad that cam worked well for you too !
I wish we would have flowed the heads after they were finished , but we didn't.
We did use a windage tray from 440 Source as well as their oil pan.
The distributor is from Fire Core.
Thanks,
Mark

Put a bigger carb on that thing and hang on............a 750 barely belongs on a hot small-block...........

Nice numbers on the 470!

I have nearly the identical engine. The only difference is my Edelbrock RPMs have not had bowl work, my carb is an 800 DP, and my cam is a Comp solid roller.

My Firecore distributor is set at 24 initial and 34 total. I think it needs more initial and maybe slightly less total advance, but the snow came early so I'm done until Spring

I apologize if I am hijacking Mark's thread but I am wondering if some of you experienced builders would like to speculate whether my cam:
( http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=741&sb=2 )

would, all else being equal, make more or less HP/TQ than Mark's cam:
( http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=731&sb=2 )

Any takers?

I thought I recognized that dyno room! Dale and crew are good people. My 434 small block was dynoed there.

Nice combo Mark.