Porting 781 bbc heads

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August undefined, 2024

WebMay 4, 2024 · 781 casting BBC heads. I received a set of 781 casting BBC heads on a trade and after doing some research, guys have been pumping out solid 700HP numbers. What … WebSep 19, 2016 · Im porting my 781 heads As i read in many articles here and on other sites the main power is hidden in the bowls.. I mainly clean and do a mild port to make sure …

bbc 781 flow numbers, realistic? Team Chevelle

WebApr 4, 2011 · Joined Nov 7, 2006. 3,934 Posts. #3 · Apr 4, 2011 (Edited) 781's are Large Oval Ports not Rectangular with approx a 118cc Combustion Chamber (Always CC BBC Heads to ensure the Volume as they have been known to differ). The Guides are Critical and you can install larger 2.19/1.88 Valves with moderate Bowl porting. WebJan 1, 2012 · He is at 12.1 comp with a stock GM forged 454 crank with forged I-beam rods, a hydraulic roller with bowl ported 781's with stock sized valves and we figure he's right around 525hp easily. The engine has never been on a dyno, but that's what we conservatively figure he's at. Last edited: Jan 1, 2012 1 2 Next simplyhealth optimise cash plan

781 casting BBC heads - Don Terrill’s Speed-Talk

WebMar 18, 2008 · All of those closed chamber big block heads will require hardened valve seats and that's going to cost some dollars plus the valve job and porting time and parts... also be carefull installing 2.19/1.88 valves with hardened seat inserts-many heads will hit water when cutting for the inserts. WebJun 20, 2009 · They are a great street head, and will work pretty well on everything from a mild cruiser to a hot street car. They respond well to bigger valves and basic head work. … WebNov 19, 2016 · I home ported a set of 781's for my SFT cam 468 and did 11.43 @ 117.7 mph, first time at the track without any tuning. Car setup is listed below. 65 Pontiac Lemans 532 BBC, t400, 9" w/3.50's Best 1/4 mile. 11.43 @ 118 mph ( previous 468 ) S steelcomp Banned Joined Dec 19, 2008 4,526 Posts #10 · Nov 16, 2016 BigRed-L72 said: raytheon bohemia ny

Rectangle Vs. Oval Port Big-Block Head Test - MotorTrend

Porting 781 bbc heads

WebAug 14, 2024 · Part 22GM 781 Cylinder Head Porting"Porting The Bad Port"620HP 454 Chevy Engine Build. WebApr 16, 2010 · 781 heads don't need extensive porting to be 600 HP capable. They need a bowl port and larger valves installed. I would also install new 11/32" guides and stainless …

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WebJan 5, 2009 · I dont understand a few of the locations in the DIY instructions. 1.) Roof of the valve pocket 2.) Valve throat ( to 85 % ) I have an idea where this is but im not 100% sure. I assume I can use a snap gauge and micrometer to get this area to 85 % … WebJan 28, 2010 · BBC 781 heads. Discussion in 'The Hokey Ass Message Board' started by kentuckyscum, Jan 28, 2010. Joined: Dec 11, 2009 ... I have the 781 x heads on my truck …

WebSep 2, 2024 · If anyone is thinking of using a set of 781 BBC casting cylinder heads for anything more than stock use, you may have to cut your intake side valve spring pockets … WebProMaxx heads have started a revolution in the performance world. They have custom designed a head to meet the demands of the Big Block Chevy world, while keeping the quality high and the price reasonable. These BB-Chevy heads come in an As-Cast series or Full CNC-Ported series.

WebFind many great new & used options and get the best deals for Big Block Chevy Oval Port Cylinder Heads 781 Casting at the best online prices at eBay! Free shipping for many products! ... L-19-5. 1966 Big Block Chevy BBC 396 427 Oval Port Heads 3872702 702. L-17-5. L-19-5. $350.00 +$200.00 shipping. Best Selling in Cylinder Heads. WebPromaxx Performance BBC aluminum heads start in price at just over $1,500 for a pair of bare castings and reach just under $4,000 for a pair of assembled and CNC-ported heads. What Are The Main Benefits of ProMaxx Performance Big …

WebAug 17, 2024 · Part 23 - GM 781 Cylinder Head Porting "Porting The Good Port" - 620HP 454 Chevy Engine Build - YouTube Part 23GM 781 Cylinder Head Porting"Porting The Good Port" Part 23GM...

WebMay 20, 2015 · The 781 and the 049 are virtually identical, both great heads. They like bigger valves 2.19 & 1.88 and a little bowl work Lots of the guys at Team Chevelle run 10s with … raytheon bombs in yemenWebAll AFR big-block heads feature “rolled-over” valve angles, which are listed as 24/4 degrees (intake) and 15/4 degrees (exhaust); 3/4-inch-thick deck surfaces for brute strength; and 3/8-inchraised exhaust ports. Most exhaust headers still fit, but you need to check for adequate clearance in your engine bay to be sure. simply health optical coverWebMar 31, 2005 · Jan 1, 2005. 1,886. Fairbury, NE, USA. I received a call from my head porter today about the flowbench results on my home ported 049s. I gained a grand total of 1 cfm on the intake and 10 on the exhaust. This is with the addition of 2.19/1.88s and desrouded chambers as well as some porting. He did promaise me he could gain 55 cfm on the … raytheon bombWebSymmetrical port heads are available for 5.000-, 5.200-, and 5.300-inch-borespace engines in either cast or billet aluminum with whatever combination of valve angles, port shapes, and chamber volumes are needed for ultra-high-horsepower Pro Mod, truck pulling, and mountain motor Pro Stock racing. simply health optimise level 3WebJul 18, 2012 · Equipped with the Procomp heads, the BBC stroker pumped out 690 hp and 600 lb-ft of torque. We suspect the large port volume and sizable combustion chamber hurt torque and power on this... raytheon boeingWebJun 28, 2014 · 496 BBC with CPM ported 781 iron port heads and intake. Custom solid roller cam, 10.2:1 compression, dynoed on 91 octane BP gas. simply health or similarWebSep 4, 2012 · Looking strictly at flow, we see a direct correlation between port volume and flow on the factory BBC heads. The smallest of the bunch (peanut port) flows the least at around 250 cfm, while the ... raytheon boomerang