The potential of basic GM production parts is the subject of this test. Theres allway a lot of controversey on dyno numbers, but this is a basic build I would like to share with this forum. 4.280 X 3.998 460 cu in, GM 959 454 block, Scat 9000 crank, GM truck rods, Mahle pistons 10.5 compression, Isky 560 lift 254 @ .050 108 installed 103, Ported 049 GM oval port heads, Ferrea valves, Smith bros pushrods, Scorpion rockers 1.7 ratio, RPM air gap intake, 850 holley (4781) 35 degrees total timing 91 octane pump gas, moroso 20403 oil pan, 5.5 quarts of Gibbs XP4 oil. This combination would easily push a full weight Chevelle well into the 10 sec range.
Putting it to the test
1 reading
VORTECPRO
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Foot brake, Kearney Nebraska
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Just my opinion....but that's a 10.10 or so here in Houston on a mild evening. 6.40 in 1/8th I bet with no wind and something below 1000 DA. Just for reference, I have a friend that went to a notoriously "generous" dyno and put out 645 out of a small block. His car runs in the same range as the numbers above but is 600 lbs lighter!
Bill
Bill
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I'll ask again what were your incrementals.
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Kearney is listed at 2150' so that was very good air. 6.61 is stellar for the first time out, congrats! What's the lowest setting on your 2 step? I think mine is 2200 which is going to be high for footbraking my car but I still think I might try it....Dave
I love the car.A car that weighs 3700 getting down the track the way it does with parts that just dont work.Just proves that attention to detail and correct assembly can go a long ways.Also putting it in a car that uses what it has and not throw a big precentage away is priceless also...Good job
Thanks guys, the 700 HP 496 is next.
Or even better yet the peanut port, the 10 sec peanut port:yes:Attachments
ok i see the attention to detail thing going a long way .and i agree the little things make all the differance. i have built many 454 solid flat engines that ran 11.0s with stock valves with a good valve job and a backcut on the intake valve. that being said what to hell are you doing to get a full second more performance out of the same heads.
you must have a full day of grinding into those ports and the valvejob on each head.
:thumbsup::thumbsup: those heads are working. great engine
you must have a full day of grinding into those ports and the valvejob on each head.
:thumbsup::thumbsup: those heads are working. great engine
Thanks, heres a picture of the rough heads before porting and CCing. Its not just one thing, its paying attention to the total package, Ive been building and refining the same engines for over 6 years now. But theres more in the car setup, after all this is after a total of 5 passes with this engine, with zero track tuning due to wind.
Attachments
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This is sweet!
What RPM is the shift Mark?
What torque converter was used?
What RPM is the shift Mark?
What torque converter was used?
1st to sec 6200, sec to third 6400, ATI converter.
I know I would really like too see the 700hp / 496 as your next test. Know problem at all getting in the 9s, but just how deep. Wow 5 pages and know happy dyno guys its a record!Thanks guys, the 700 HP 496 is next.
mark
just wondering where the true torque peak is on one of these engines i have seen some of the other dyno sheets on other engines you build and most of them seem to be droping torque from the start of the pull. is this due to you just testing in the useable rpm range using a good convertor.
im wondering this due to my own engine has a 252/258 degree cam on a 106 installed at 103icl and my convertor is a 5200. and im wanting to see if slipping past my peak. thanks.
just wondering where the true torque peak is on one of these engines i have seen some of the other dyno sheets on other engines you build and most of them seem to be droping torque from the start of the pull. is this due to you just testing in the useable rpm range using a good convertor.
im wondering this due to my own engine has a 252/258 degree cam on a 106 installed at 103icl and my convertor is a 5200. and im wanting to see if slipping past my peak. thanks.
Peak TQ on this build was 4600, converter flash was 5000, but in good air 5100, which would have been very close to ideal.
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Wheres all the after pics, along with detailed instructions?
Looks and runs real good! I always like seeing what you're doing with these things.
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Hey Mark
Happy dyno LOL,, I am lovin it
Excellent results which speak for themselves.
Not unexpected though,,, some of us are aware of what you do but it is still good to see confirmation for those that like to play internet expert
Atta boy from up here in the sticks :beers:
Happy dyno LOL,, I am lovin it
Excellent results which speak for themselves.
Not unexpected though,,, some of us are aware of what you do but it is still good to see confirmation for those that like to play internet expert
Atta boy from up here in the sticks :beers:
Yeah, no kidding lol I have a set of 049 heads just sitting around I'd like to do some work to.Wheres all the after pics, along with detailed instructions?
Looks and runs real good! I always like seeing what you're doing with these things.
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