John Scott Posted December 12, 2001 Share Posted December 12, 2001 Mister GV, At your convenience, I'm making a couple of revisions to my build, could you run these numbers for me please? 383 sbc 6inch rod, Cam: Solid roller, 600 lift/ 244/248 duration/ 110 LSA. 11.0:1, victor Jr, 1 3/4 full length header. 750 cfm carb. Dart Pro1 215s fully ported. The cam lift is by recommendation of what works at our altitude. My builder's forte is head flow. The top racers swear by his work. Loves the Dart heads. Thanks! JS Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted December 13, 2001 Share Posted December 13, 2001 and the MAJIC computer makes it guess at 489hp@5500rpm and 501 ft lbs at 4600rpm BTW thats one of the best combos with a good wide torque curve Ive ever seen in a 383cid! and thats flywheel hp with open headers but just for your info. the hp only drops by about 10hp with the headers running into the exhaust system Quote Link to comment Share on other sites More sharing options...
Guest Fast Frog Posted December 13, 2001 Share Posted December 13, 2001 GV: What software are you using for John's scenario?? Looks like he's pulling all the "stops". My ?? to you and John is, "is that cam to big for this altitude"(4700-5200ft)? Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted December 13, 2001 Share Posted December 13, 2001 those numbers dont add.. my combo 383 5.7 rod dart conquest < same head as the pro 1 just changed the name > fully ported cam .598 lift 255 @.050 intake 265 @ .050 exhuast @110 LC 11-1 1 3/4 sanderson full length header victor jr with a 750 and my car made 575 flywheel horses on the dyno. your cam isw 10 degrees down from mine but that would not account for a 100 horse power diferance anda 1300 rpm peek power diferance.. my peek power is at 6800 rpm .. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted December 13, 2001 Share Posted December 13, 2001 Grumpy probably took into account the fact that John is in Colorado where the air density , and thus volumetric efficiency, is much less, hence the power loss. Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted December 13, 2001 Share Posted December 13, 2001 all I can say is the computer program Im useing has matched dyno # within 3% in almost every case so far , and yes I compensated for denvers 4500ft-5000ft altitude but I don,t know for sure how well the program handles that altitude info as its seldom used but because we went through this before I tryied to get it correct. Quote Link to comment Share on other sites More sharing options...
z ya Posted December 14, 2001 Share Posted December 14, 2001 Grumpyvette, If you get a chance could run some numbers for my motor. 355 sbc/10 to 1,AFR 195's cnc ported,750 holley,air gap intake,1 5/8 block huggers,hi output HEI,1.52 pro magnum rollers, 286/490 comp magnum,110 lobe sep. If you need the exhaust it is an x pipe with spintech prostreet mufflers/2.5 inch.Thanks , I hope is says 400!! Quote Link to comment Share on other sites More sharing options...
John Scott Posted December 14, 2001 Author Share Posted December 14, 2001 Grumpy, thanks again for your time. The lower duration does just that, brings the peak power down. I want a low rpm engine that gets going around 2 and gets its job done by 6! Looks like this is the ticket! In the summer we can lose 20% or more of what you sea level dudes run. 'course we only need to inhale every third day when we come down for a visit Conquest heads did evolve into the Pro1s. I don't know if there is any difference in their design other than the new name. My engine builder has been trying real hard to convince me that, with experienced porting, they clean up and flow great #s. I hated the out of box Dart #s compared to the AFRs. FastFrog, my builder has a good rep. of building drag motors that work at Bandimiers altitude. Pro Mods on down. He recommended early on that our altitude benefits from more lift than typical cam designs. He also has found that up here, shorter duration works well with the 377 383 combination, according to his dyno tests. Computer numbers are just a helpful starting point for reference. Bottom line is the time slip. I'm getting real close to locking into these specifications. I may order the cam and get the heads going today! JS Quote Link to comment Share on other sites More sharing options...
fl327 Posted December 14, 2001 Share Posted December 14, 2001 or something. Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted December 14, 2001 Share Posted December 14, 2001 z ya the computer says 386hp/396 ft lbs for that setup.changeing to a crane #110921 solid lifter flat tap cam will get you to 410hp and 403 ft lbs (.518/.536 lift 244/252 dur. on a 106LSA)according to the computer but it will idle a lot ruffer and you will need to adjust valve lash more often and have a little less low end power, call crane and talk to them,1-386-258-6174 (personally Id do it but I don,t care how my car idles as long as it smokes the tires when the gas is floored but look at it this way,...is a 6.2% boost in power that you only use once in awhile worth the trouble and expense to you ? I bet that car already runs pretty fast as it is! Quote Link to comment Share on other sites More sharing options...
z ya Posted December 14, 2001 Share Posted December 14, 2001 Thanks Grumpy! I think those #s will work out just fine. The guys at AFR told me too look for about 415hp but oh well. I am lazy so I went with the non mech cam. I will make the #'s up with a small 125 shot of NOS . Thanks again z ya Quote Link to comment Share on other sites More sharing options...
z ya Posted December 14, 2001 Share Posted December 14, 2001 Hey grumpy, I forgot to tell you that the cam is 236 at .050. I dont know if that will was needed? Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted December 14, 2001 Share Posted December 14, 2001 I looked it up before I input it Quote Link to comment Share on other sites More sharing options...
z ya Posted December 14, 2001 Share Posted December 14, 2001 Thanks!!!!! Quote Link to comment Share on other sites More sharing options...
z ya Posted December 14, 2001 Share Posted December 14, 2001 Hey GV, I was looking at an 350 build up that HOT ROD mag did a while ago. I cant find the mag but I wrote the engine specs down cause I wanted to try and copy or up that engine. It was a 350 that was un bored making 9.6 comp. It had and air gap with a 750 holley. The heads were out of the box Trick Flows with no port work. The cam was a 268 extreme energy with 268/280..477/480 lift with 106 loa. Its had 1.52 rollers as well. The ignition was an hei and it also had 1 5/8 block huggers. This sucker made 416 hp on there super flo engine dyno! Now, I know my heads are better. My cam is stouter and I have a little more comp ratio. Why do you think that set up made more than mine? Does the computer under rate the figures a bit? I would like to see what that motor makes on your program as to compare it to mine. I swear I am not wining, just curious... Thanks z ya Quote Link to comment Share on other sites More sharing options...
z ya Posted December 14, 2001 Share Posted December 14, 2001 OOPs, The cam was a 110 LSA. Sorry.. Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted December 14, 2001 Share Posted December 14, 2001 they used no accessorys and full length primary tube open headers and your engine with that comp cam you picked would measured the in the same way=417hp/420 ft lbs according to my computer, and the crane cam #110921 would have 440hp/427 ft lbs measured that way and your engine with the 268 cam would get 407hp/429ft lbs according to the computer, if you want more power get full length 1 3/4" headers and a victor jr intake with your present cam those two changes will boost you to 445hp/430ft lbs with a 3" exhaust and low restriction mufflers (little changes can mean alot) Quote Link to comment Share on other sites More sharing options...
Guest zfan Posted December 14, 2001 Share Posted December 14, 2001 Hey Grumpy, Got a question for you. Im currently running a 350 sbc, 30 over. Compression is 10.4 to 1. Heads are edlebrock rpm striaght plug heads. The cam is a comp cams extreme energy xr288hr-110 lobe seperation,236/242..520/540 with 1.5 roller rockers. The intake is a airgap with edlebrock 750 carb. Headers are Sanderson 1.5 shorties into 2.25 with spintechs. I am currently thinking of upgrading to victor jr. Same carb and 1 5/8's or 1 3/4 long tube headers. Whats your crystal ball have to say about this set up. Wrong move, waste of time or well worth it? Thanks Mike Quote Link to comment Share on other sites More sharing options...
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