AFR 265- What Bore/stroke would be best for a 500" - Chevelle Tech
Performance Our High Performance area

 12Likes
Reply
 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 19 (permalink) Old Jul 10th, 17, 11:32 PM Thread Starter
Tech Team
Andy
 
Join Date: Mar 2015
Location: Lancaster PA
Posts: 161
Garage
AFR 265- What Bore/stroke would be best for a 500"

OK so let me state this, I have a set of CNC AFR 265's on my 408" BBC .... Thinking about throwing a few more cubes under them.

From what I can tell these heads could support upwards of high 600 HP to possibly 700, Thinking of maybe a 670 ish build. So thinking 496 in to 509 ish.... which might be a tad big for these heads?

That being said, also what Bore Stroke combo would be best fit with these heads? Would it make any noticeable difference between a 4.25 stroke and 4.310 bore over 4.0 stroke and 4.56" bore for these heads?

Or when looking at airflow, is Cubic inches all that matters? Since HP is directly related to the amount of flow available? It seems to me that velocity plays a part of how these heads flow well to about 6,000 rpms.... does that change with a short stroke larger Bore, or is it all relative to cubic inch?

I am leaning on a short stroke larger bore, for less torque (light car 3000#) but still hit the HP numbers I am looking for. But can easily swayed into a 496" for lower revving easy on parts and the pocketbook build.

Thanks for any help.
Ialone is offline  
Sponsored Links
Advertisement
 
post #2 of 19 (permalink) Old Jul 11th, 17, 1:52 AM
Lifetime Premium Member
Devin
 
Join Date: Jan 2002
Location: NorCal
Posts: 2,529
Garage
Re: AFR 265- What Bore/stroke would be best for a 500"

Somebody will argue with this, but without racing intent stated, I would stay with a simple 454. Those heads will work well. No need to overthink or spend cubic dollars without a goal to win.
Steve R and Ialone like this.

Just an El Camino
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Son's build:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


My never-ending project:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
64SS427 is offline  
post #3 of 19 (permalink) Old Jul 11th, 17, 3:53 AM
Boldly procrastrinating
Tom Terrific II
 
Join Date: Oct 1998
Location: Glendale, Az
Posts: 28,040
Garage
Re: AFR 265- What Bore/stroke would be best for a 500"

pretty much same here, but I'd do a 4.310 x 4.25 496. stock block easy to get parts, lot's of choices available for crank/rods/pistons. If you buy decent stuff like a internal balance 4340 Scat crank and Scat 6.385 rods you'll be able to re-use the stuff in a Dart 4.5" or 4.6 block later.
Ialone likes this.

Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.
Tom Mobley is offline  
 
post #4 of 19 (permalink) Old Jul 11th, 17, 5:56 AM
Senior Tech Team
 
Join Date: Dec 2005
Location: Lancaster, PA
Posts: 10,869
Re: AFR 265- What Bore/stroke would be best for a 500"

Basically you run into 2 issues. Long stroke cranks use up more head than a large bore motor. But on the flip side, a 509 will need a 4.5 bore block, and you are not doing that without a special block. If it was me, I would look at just building a 468. Put a stock steel crank in it and go.
Ialone likes this.
bracketchev1221 is offline  
post #5 of 19 (permalink) Old Jul 11th, 17, 6:09 AM
Senior Tech Team
 
Join Date: Feb 2000
Location: SF Bay Area
Posts: 9,772
Re: AFR 265- What Bore/stroke would be best for a 500"

As stated above, if you are not racing and you are keeping an eye on your pocket book, why spend the extra money that may only give you marginal improvement. Spend the extra money on other items that may need upgrading.

Steve R
blue_69_malibu likes this.
Steve R is online now  
post #6 of 19 (permalink) Old Jul 11th, 17, 8:08 AM
Senior Tech Team
 
Join Date: Dec 1998
Location: Lubbock, TX
Posts: 4,289
Re: AFR 265- What Bore/stroke would be best for a 500"

While the combos weren't optimized, a rag did a story several years ago comparing all 3 - short stroke/big bore, medium both ways and long stroke/small bore. All made within a few ft lbs and hp of each other.
Least expensive is 496, the others require either a 502 or aftermarket block.
blue_69_malibu and Ialone like this.

Gary Adrian
Organized people are just too lazy to look for their stuff...
Busted Knuckles is online now  
post #7 of 19 (permalink) Old Jul 11th, 17, 9:33 AM Thread Starter
Tech Team
Andy
 
Join Date: Mar 2015
Location: Lancaster PA
Posts: 161
Garage
Re: AFR 265- What Bore/stroke would be best for a 500"

Appreciate all the advice... My issue is finding a good block anyway that I wont have near $1500 in just to buy and machine... almost the cost of a good aftermarket 4.5" block... so the extra $600-700 really isn't that much more.

Unless any of you know where I can get a good 60 over 4 bolt GM block with good lifter bores for cheap? Everything I have come across lately is around $1,000..... without any machine work.

The goal is to get my 3000# car into the 9's... no power adders
Ialone is offline  
post #8 of 19 (permalink) Old Jul 11th, 17, 10:25 AM Thread Starter
Tech Team
Andy
 
Join Date: Mar 2015
Location: Lancaster PA
Posts: 161
Garage
Re: AFR 265- What Bore/stroke would be best for a 500"

Quote:
Originally Posted by EZ Nova View Post
Andy, WHAT DO YOU HAVE NOW??????

9 seconds at 3000 lbs is a fairly easy job to do. Just let us know what you have and "we" as a group and help with the results.

But might be the best "band-for-the-buck" to call Mark Jones and get him to work with you!!!!


I have a small 408" never dyno'd most likely 500 HP ish... It takes more cubes to make the HP I need without having to spin it over 7000...


Mark is on my list to call.... thought about sending him my heads and intake and see what he can do.

Thanks
Ialone is offline  
post #9 of 19 (permalink) Old Jul 11th, 17, 11:31 AM
 
Join Date: Dec 2005
Location: Tri-Cities
Posts: 8,791
Re: AFR 265- What Bore/stroke would be best for a 500"

The heads out of the box will support 712HP with no mods. It will take a max effort cam. I have shelf semi customs in a 496 pump gas with the 265's that have made over 625HP.

Chris Straub
Mfg Performance Parts

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Why is it we never have time or money to do it the right way in the beginning but we always have time and money to do it over again?
cstraub is offline  
post #10 of 19 (permalink) Old Jul 11th, 17, 12:51 PM
Team Member
George
 
Join Date: Feb 2010
Location: Upper Sandusky, Ohio
Posts: 2,516
Re: AFR 265- What Bore/stroke would be best for a 500"

Quote:
Originally Posted by Ialone View Post
Appreciate all the advice... My issue is finding a good block anyway that I wont have near $1500 in just to buy and machine... almost the cost of a good aftermarket 4.5" block... so the extra $600-700 really isn't that much more.

Unless any of you know where I can get a good 60 over 4 bolt GM block with good lifter bores for cheap? Everything I have come across lately is around $1,000..... without any machine work.

The goal is to get my 3000# car into the 9's... no power adders
How far from Ohio are you? Lots of 454 blocks around here. Proabably not 4 bolt, but 2 bolts are about everywhere...

'71 Malibu
3580 #, Carbed 6.0l LS swap in process
T-350, PTC 9" converter, 12 bolt, spool, 3.90 gears, MT ET R 275/60/15

355 [email protected]
125 [email protected]
383 Mud Motor- [email protected]
100 shot [email protected]
'72 Greenbrier Wagon: 454, 700R4, 12 bolt with 3.73
Geo71 is offline  
post #11 of 19 (permalink) Old Jul 11th, 17, 2:49 PM
Senior Tech Team
 
Join Date: Dec 2005
Location: Lancaster, PA
Posts: 10,869
Re: AFR 265- What Bore/stroke would be best for a 500"

Quote:
Originally Posted by Ialone View Post
I have a small 408" never dyno'd most likely 500 HP ish... It takes more cubes to make the HP I need without having to spin it over 7000...


Thanks
Don't be afraid to spin it. My 540 was shifted at 7400 and crossed as high as 7800. My 565 now made peak power at 7200 and will be shifted at 74-7500. Big engines can rpm just fine.
bracketchev1221 is offline  
post #12 of 19 (permalink) Old Jul 11th, 17, 3:10 PM
Lifetime Premium Member
Marcus
 
Join Date: Sep 2005
Location: Sweden
Posts: 5,853
Garage
Re: AFR 265- What Bore/stroke would be best for a 500"

See if you can send your heads to Mark Jones and he can build you a nice 496 with them.
https://www.chevelles.com/forums/13-p...ne-intake.html

Chevelle Malibu ss 64
489 BB with parts from Lewis racing
Alumitech radiator with dual spals
Th 400 Edge 9.5" converter
57 3/4 wide 12 bolt: Eaton posi, Us gear 3.31, Toms KA 33 splines axles
Malibu ss 64 is online now  
post #13 of 19 (permalink) Old Jul 12th, 17, 6:02 AM
Lifetime Premium Member
Bill
 
Join Date: Jan 2010
Location: VA
Posts: 318
Re: AFR 265- What Bore/stroke would be best for a 500"

FWIW, my 4200 lb truck ran a best of 11.09 with a 1.50 60 ft, 496 with the same AFR 265's, 10.0 CR and a Straub solid roller
Ialone likes this.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


90 454SS
92 454SS
va454ss is offline  
post #14 of 19 (permalink) Old Jul 12th, 17, 7:50 AM
Senior Tech Team
Jarad
 
Join Date: Jun 2012
Location: Louisville, KY
Posts: 1,464
Re: AFR 265- What Bore/stroke would be best for a 500"

Quote:
Originally Posted by va454ss View Post
FWIW, my 4200 lb truck ran a best of 11.09 with a 1.50 60 ft, 496 with the same AFR 265's, 10.0 CR and a Straub solid roller
That is impressive.

72 Slovelle
555 Pump Gas BBC
1.32/[email protected]
JBoggs is offline  
post #15 of 19 (permalink) Old Jul 12th, 17, 8:15 AM
Senior Tech Team
Scott Foxwell
 
Join Date: Dec 2008
Location: N/E Tennessee
Posts: 3,676
Re: AFR 265- What Bore/stroke would be best for a 500"

Those heads on a 496 will work very well.
Ialone likes this.

FOXWELL MOTORSPORTS
Straub Technologies

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
steelcomp is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in









Old Thread Warning
This Thread is more than 765 days old. It is very likely that it does not need any further discussion and thus bumping it serves no purpose.
If you still feel it is necessary to make a new reply, you can still do so though.

Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome