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Are 990 bbc heads good

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chevy parts. -. $150. msd two step and rpm limiter 25 each, MSD chip some new about 20 50 ,454 stock balancer 30. BBC race gasket set (less oil pan) 65 , bbc 990's heads square port steel heads cleaned and magged 400 or valves , roller springs good to 700 lift, and set of pushrods, and 454 balancer 550 firm. bbc crane roller rockers 125,fresh. If thats fairly "typical" of a 990 head without being heavily reworked....."looks like" you would be well served with a cam having around 8-10 degrees more exhaust duration at least. The I/E ratio is in the low 60's(averages 62.75%). A remanufactured cylinder head is a head that has been rebuilt with parts that are still serviceable. Some cylinder heads have been welded or repaired. All cylinder heads are pressure tested to assure a leak-free casting. New valve seats have been installed when needed. All cylinder heads have a three angle valve cut with a blade type seat cutter.

CP Pistons Carrillo Industries, Inc., offer high quality performance products with excellent customer service. We strive to provide the best internal engine components to the customer; offering both pistons and rods.

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This graph shows how our L88 made power at specific rpm ranges, with peak power occurring at 5,900 rpm, and max torque at 4,900 rpm. It's notable that torque readings remained at around 550 lb-ft from 4,400 rpm through 5,200 rpm for an eyeball-flattening mid-range! 1. The '69 L88 block used casting number 3963512, configured with four-bolt mains.

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 · Those heads are about 320cc intake ports and can handle up to about 725-750 hp. I ran Dart 325cc heads on my 509 and they were a little small on my 540. If you are around town driving and staying below 6500 rpm max, I think a good 781 casting head would do great. But if you plan on shifting it at 7000 plus than the 990 head is pretty good.

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