What to expect out of a 496 CI
#11
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The heads being used at this time are the worked over 049 casting's oval port 2.19's and 1.85's by Valako. We get these things to flow well and considering were under 500 CI and staying under 610 to 615 lift they will work fine. I used many of the dart recs and use to wedge them at this CI. Trq. and dyno results are amazing.
This is kind of a quick fix for this year. Next year I have decided to go to the 572's
This is kind of a quick fix for this year. Next year I have decided to go to the 572's
#12
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i am ordering the sticks today from bob. he needs the flow results and i'll let him decide. on the CI route i go. years ago we had good results with the oval ports up to 496 CI however i'll have to dig for the data.
#14
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Without going crazy and having a reliable piece that can run on pump gas, you can expect about 1.20 hp/ci with aluminum heads and about 9.5:1 compression. With a little more compression and a decent size cam, you could expect to see 1.27-1.29 hp/ci. Hope this helps, Eddie
#15
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The heads being used at this time are the worked over 049 casting's oval port 2.19's and 1.85's by Valako. We get these things to flow well and considering were under 500 CI and staying under 610 to 615 lift they will work fine. I used many of the dart recs and use to wedge them at this CI. Trq. and dyno results are amazing.
I guese my builders are not as good ! My dyno results were 500 hp max and 600 trq max. peaks around 4k (I think) 496 ci. Dynoed wet with stock merc center dump and water pump, sea pump and alt.Dart alm. pro 1s 310 cc elderbrock air gap 9.3 or so comp. msd dist. Dont have cam specs right now 750 demons .Should I be worried Can I get more or just build 540s they seem to be getting 700hp plus or so out of only 40 more ci what gives?
#16
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I guese my builders are not as good ! My dyno results were 500 hp max and 600 trq max. peaks around 4k (I think) 496 ci. Dynoed wet with stock merc center dump and water pump, sea pump and alt.Dart alm. pro 1s 310 cc elderbrock air gap 9.3 or so comp. msd dist. Dont have cam specs right now 750 demons .Should I be worried Can I get more or just build 540s they seem to be getting 700hp plus or so out of only 40 more ci what gives?
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I guese my builders are not as good ! My dyno results were 500 hp max and 600 trq max. peaks around 4k (I think) 496 ci. Dynoed wet with stock merc center dump and water pump, sea pump and alt.Dart alm. pro 1s 310 cc elderbrock air gap 9.3 or so comp. msd dist. Dont have cam specs right now 750 demons .Should I be worried Can I get more or just build 540s they seem to be getting 700hp plus or so out of only 40 more ci what gives?
#18
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Thanks guys Im going to look into headers next but wow...there damn near as much as motors.They say headers are better so I thought I would by headers even though I may not realy need them now but so as not to double buy if I ever go to bigger ci later.Any thoughts? And can I get my current carbs flowing better? These only have 5 hrs or so Thanks
#19
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Thanks guys Im going to look into headers next but wow...there damn near as much as motors.They say headers are better so I thought I would by headers even though I may not realy need them now but so as not to double buy if I ever go to bigger ci later.Any thoughts? And can I get my current carbs flowing better? These only have 5 hrs or so Thanks
As far as carbs, I can get you custom Holleys built to spec for around $700 +-. Real nice units with billet base plates and metering blocks. 4150 flange and whichever size you want. This one is a nice 950 I have made and it cost me around $700
#20
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Just talked to Valako today. Jim is a great guy and does excellent work. I met him back in 1989 and have been friends ever since. He has a couple set of my heads right now a matter of fact. If there is power to be made somewhere Jim will find it. It may involve throwing a bolster seat or something out the boat though. ha ha.
We did talk today regarding the 496's and he feared for me knowing the way I run my boats. He has been beside me more than a few times in lake MI. I said the same thing to him that I might just wait and save for some bigger CI' engines.
Hey Rookie,
Do you recall what cam you ran in your 470's??? I think Jim and I were actually discussing your engines as I remember hearing about him doing some work for you on the board.
Let me know,
Thanks,
John
We did talk today regarding the 496's and he feared for me knowing the way I run my boats. He has been beside me more than a few times in lake MI. I said the same thing to him that I might just wait and save for some bigger CI' engines.
Hey Rookie,
Do you recall what cam you ran in your 470's??? I think Jim and I were actually discussing your engines as I remember hearing about him doing some work for you on the board.
Let me know,
Thanks,
John