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#21
06-27-2017, 12:53 AM
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In my limited experience, the closer the LSA, the more RA exhaust manifolds hurt. Keep you LSA around 114 and they won't lose too much.
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#22
06-27-2017, 10:21 AM
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Save money. Run your stock logs. No need for RA manifolds or headers.
Just buy the 2.5 mandrel bent downpipes from Pypes, and put mandrel bent pipes all the way back, no compression bends! Remove the heat riser from the passenger side log, plug the shaft hole. My Super Comp headers are hanging on the wall, and my other sets of headers have been sold, in favor of stock looking logs. Oh yeah, my engine is a 433ci, has a Comp roller cam, Carrillo rods, Ross pistons, modified tripower, and needs a mixture of race gas if I lean on it. |
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#23
06-27-2017, 07:01 PM
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According to SD Performance http://www.sdperformance.com/moreTech.php?newsID=39 you want to run a LSA of 112 or larger and keep the duration on the smaller side to reduce overlap if you are going to run RA Manifolds instead of headers.
__________________
Karl 
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#24
06-27-2017, 07:54 PM
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__________________
1979 Trans Am 307 RWHP 380RWTQ 13.8@103 1979 400 Block, 1970 Heads, Unknown Cam, Comp Cam Lifters, Edelbrock RPM Intake, Hedman Headers, Holley 750 Carb, WFO Drop Base SOLD 1968 GTO convertable project. 400 auto with air. west coast car . Not started in 15 ..update now running (around block spinning tires all the way. Have a lot of cosmetic work to do winter of 17/18 1969 GTO 400 4 Speed this a complete project. Rebuild will start in spring of 2017. SOLD |
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