WebThese heads work well across the full rpm range. The port is ½ shorter than the rectangular port which helps generate air velocity at lower rpm. With some porting work and larger valves, these are the heads that may be … WebDec 20, 2009 · Those heads will work well on any flat top 454 or 496, it would almost be a waste to use 'em on a 396, IMHO. Gary Adrian Organized people are just too lazy to look for their stuff... 1 - 9 of 9 Posts This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
big block heads Chevy Nova Forum
WebApr 26, 2008 · 1,522 Posts. #2 · Apr 25, 2008. Unless you have a super high performance BBC, you shouldn't need to do alot to the heads to get good performance from them. I would just smooth out the casting and a few transitions and call it good. Also do the porting first, then have the new valves sizes cut. If you port it all the way up to the valve seat ... pak thong chai thailand
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WebSep 8, 2016 · Getting your current size intake valve open to the point where your heads are flowing there biggest numbers by 70 to 74 degrees of crank rotation is where you will find the greatest power gains ! A tuned merge collector will increase the motors VE numbers much more easy than yanking the heads to pack in bigger valves. WebSep 16, 2024 · These heads are real large ovals and they have anywhere from 96.7 to 98 cc chambers. Not the hot ticket like the newer open chambered heads, but as I figure like GOSFAST said, a little hand-work and you should be good to go. Probably go from something like 7.9 to 1 CR up to about 9.25 to 1 CR using the .020" thick steel shim … WebMar 5, 2012 · I think these would work better to help raise compression and low end power there 200 bucks more then the dart heads but also 20cc less intake. For a street setup oval ports create more low speed torque and there are people in the tens with stock oval ports on Mark Jones engine. So if its not seeing a lot of track time would suggest these. summer 2016 holidays packages