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Wow. Those heads must be HUGE making peak power that high!

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Offset rockers?

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I just had Bullet grind me a small solid roller for my 440 W2

CRA 284/292-09UR
(U means its the old Ultradyne grind)
284/292 @.020
251/259@.050
172/178@.200
.605/.605 (1.5:1)
.645/.645 (1.6:1)
109 spread

With the right springs I bet it would be a pretty good fit for this one as well, probably as good or better torque out of the basement with a bit better breathing (.200-up) capability up top. I'm looking for the same wall to wall type torque curve but tring to 'use it all up' by about 6000-6200.

So at 370" 4600-7300 should (roughly) correlate to 3900-6100 in a 440, which was right where I was targeting.

Any flow numbers onthe heads? Just curious what they do in the mid lifts, they must be killer at ~.400 to make that kind of power up top with such a small and low lift cam

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Very impressive numbers...can't wait to see what it does in the car.

Jeez I hope my new MCH CNC Eddy's don't want to turn that much rpm...my cast crank hates me enough as it is...lol

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you should be safe aslong as that crank keeps on hating you,start worry about it if the crank start loving you enough to descide to get out of the block to see you.

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What bore size were the heads checked on?

Rod

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I actually did. I can only say that the flow loss was substantial when tested this way. J.Rob

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You can say that again. I am running the Super Victor on my car now as I received it for a very good deal in a group parts buy but it took a lot of work to get it to flow decent numbers. I would NEVER buy one again unless it was a heck of a good deal.

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Raw air numbers really only tell part of the story, creating a charge in the plenum can more than offset "raw" port numbers...particulary when you consider any given intake valve is completely closed roughly 2/3'ds of the time. Not to mention solid fuel volume displaces about ~7.5% of that air in a carb'ed motor. So a raw 300 cf/minute can really only meter ~100 cf within the roughly just over 20 seconds of each minute it gets to do it. And for half of that 20 seconds (on a street cammed motor like this one, more like ~27-28 total in a high RPM race motor) the valve is on it's closing ramp. It's pretty amazing the A/F can get in there (let alone out) as well as it does.

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Impressive #'s. Big time port work to get 300 cfm from those heads. Nice combo. Torque curve nice and broad - and not too far up in to the rpm range.

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Thanks guys. Yes the heads are worked extensively as is the intake manifold. I don't find the torque to be all that impressive. I tested at 4000 rpm and it produced 410-415 ft/lbs. However what is impressive is the little .507" net lift after .018" lash cam made even what it did. I was expecting much less to be honest maybe 485-500 hp max. J.Rob

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Raw air numbers really only tell part of the story, creating a charge in the plenum can more than offset "raw" port numbers...particulary when you consider any given intake valve is completely closed roughly 2/3'ds of the time. Not to mention solid fuel volume displaces about ~7.5% of that air in a carb'ed motor. So a raw 300 cf/minute can really only meter ~100 cf within the roughly just over 20 seconds of each minute it gets to do it. And for half of that 20 seconds (on a street cammed motor like this one, more like ~27-28 total in a high RPM race motor) the valve is on it's closing ramp. It's pretty amazing the A/F can get in there (let alone out) as well as it does.

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This is exactly why I don't put a lot of stock in intake manifold flow numbers. I have seen 400+cfm heads with sheetmetal TR's lose nothing when flowed on the head and not make any more power than an intake that imposes a severe penalty in flow. Flow just isn't the end all be all--especially when applied to the intake manifold. J.Rob

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Impressive #'s. Big time port work to get 300 cfm from those heads. Nice combo. Torque curve nice and broad - and not too far up in to the rpm range.

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Thanks guys. Yes the heads are worked extensively as is the intake manifold. I don't find the torque to be all that impressive. I tested at 4000 rpm and it produced 410-415 ft/lbs. However what is impressive is the little .507" net lift after .018" lash cam made even what it did. I was expecting much less to be honest maybe 485-500 hp max. J.Rob

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What don't you like about the TQ...is it the curve or amount or both?

I love that cam, works so good in dirt track engines.

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