Does this sound right ?
Thread Starter
Racer
Joined: Oct 2009
Posts: 441
Likes: 2
From: San Antonio TX
Does this sound right ?
Using Comp Cams online Computer ... this is what they spec out on my 327 using this cam .......XR268R solid roller setup & valvetrain accy.
327ci. x .030 over
aluminium 200cnc heads ...64cc
approx 11:1 comp.
dual plane intake & holley 750DP
440 HP @ 6500 & 443fp torque @ 4000 rpm
327ci. x .030 over
aluminium 200cnc heads ...64cc
approx 11:1 comp.
dual plane intake & holley 750DP
440 HP @ 6500 & 443fp torque @ 4000 rpm
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
I'm a long term satisfied CompCams customer, but IMCO their free cam software isn't worth loading, and seems to recommend the ubiquitous 268* duration (advertised) for nearly every streetable setup I've bothered to throw at it. Assuming an ICA of 106*, with 11:1 your theoretical Dynamic CR would be ~9:1, which is far to high for pump gas. Even with 280*advertised installed at 106* you'd still be at ~8.7:1 (still to high for pump gas), so I'd suggest you consider a 286* with the ICA installed at no earlier than 108* and that you give thought to a 112* LSA (if not wider) to calm it back down a little for the street. Yes, your true [theoretical] DCR will be less, given the lift at which solid rollers are figured, but I believe it's a good thing to allow some extra margin for cylinder pressures at the high RPM's you should be able to rev. My $.02
Last edited by TheSkunkWorks; Jan 4, 2010 at 07:07 PM.
Thread Starter
Racer
Joined: Oct 2009
Posts: 441
Likes: 2
From: San Antonio TX
The 11:1 compression is a W.A.G . (wild *** guess )??? on my part .
one slug actually is .018 out of its hole ..the lowest is .006 out
I was mainly asking about the HP and torque #'s they come up with
are they feasable realistic #'s ????
one slug actually is .018 out of its hole ..the lowest is .006 out
I was mainly asking about the HP and torque #'s they come up with
are they feasable realistic #'s ????
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
A lot is riding on actual CR, but IMHO a well put together and tuned street solid roller 327 in the 11:1 range with decent 200cc heads and non-restrictive exhaust should be well capable of ~440 HP. 
Thread Starter
Racer
Joined: Oct 2009
Posts: 441
Likes: 2
From: San Antonio TX
SW > here is the short block ...yes it has some surface rust in the cyl. next to the .018+ hole ..I will tear it back down ,re-hone and check everything again ..SB has been sitting for several years since it was freshened up... came out of a '67 RS I used to have....
just trying to get some more HP instead of my stock L-48....figured I would just build up this since I already have it and swap original engine out if it would make a decent amount of power
just trying to get some more HP instead of my stock L-48....figured I would just build up this since I already have it and swap original engine out if it would make a decent amount of power
Pro
Joined: Sep 2008
Posts: 508
Likes: 1
From: Olive Branch MS
I agree with Skunkworks. Remember that software is just a tool to play with and get some ideas and put you in the average customer's sweet spot. Please, before you pick a cam profile, especially if you are going with a solid roller, call the FREE tech line and run your combo by one of the guys (or 1 girl) there. There is some good experience there.
I'm just guessing here, but I would think you would have to spin that 327 up to 6800 or 7000 to get 440hp, but I could be wrong. Of course those motors have no problem with some rpm.
I'm just guessing here, but I would think you would have to spin that 327 up to 6800 or 7000 to get 440hp, but I could be wrong. Of course those motors have no problem with some rpm.
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Thread Starter
Racer
Joined: Oct 2009
Posts: 441
Likes: 2
From: San Antonio TX
Yea , I had a few more 327 shortblocks and a couple 283 longblocks( one 283 was a vetter' complete w/4x2 induction ) in a machine shop I used to have ....long story short, wife got shop in divorce back in 2001 and gave away alot of stuff before I could remember to get them out , & i forgot to list them as mine on the papers,........ this 327 is the only one left 
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
Lost my shop too, indirectly, and made the mistake of storing a few items, including some car stuff, with the in-laws not aware they were about to become my ex-in-laws (does that make them "out-laws"?), and it took years to recover the bulk of them.
Le Mans Master
Joined: Nov 2008
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From: columbus oh
http://www.hotrod.com/thehistoryof/h...ine/index.html