Small Block & Big Block Chevy Specific - oval or rectangle port?
05-23-2011, 07:44 AM
For a 468 street strip 7000 max rpm would like to make 650-700 hp what do you guys think I have a set of oval port 2.19 valve heads need totally redone valves and everything what would you guys do thanks.
05-23-2011, 08:57 AM
Oval if you plan on doing any knid of street driving. Rectangle ports just dont' do well at low rpm's.
Here is a good chart to start with:
We use the BB RR-O heads on my wifes 489. It will hit 7000 if needed, she shifts at 6500.
Probably making in the 600-650 hp range with a small solid roller cam.
05-23-2011, 02:31 PM
I have seen a set of 781 oval port make 700hp pump gas with work but bang for the Buck is brodix race rite oval ports. Saves weight and flow just as well.
05-24-2011, 02:46 PM
Just ask 1320racer/Ed B. and he will point you in the right direction regarding oval ports. He frequents YB, classracer.com and use to be on DRR heavily. His Firebird formula runs in the 8s with a BBC and his old BBC chevelle ran well with ovals
05-26-2011, 09:28 PM
You can also go look up Bob West on team chevelle. He runs oval ports on his 496 pump gas full weight 71 chevelle in the 9s n/a.
05-28-2011, 05:23 PM
Oval ports will take care of most any situation outside of full out racing, and even then they get the job done :D
05-31-2011, 07:24 AM
Street/strip car. Go with ovals (049 or 781s are best)
Trailer queen. Go with rectangles (990 casting)
Both will get you to your goal. But ovals with have more torque down low for street. Rectangles with make more peak power at higher rpm
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