Guest zfan Posted July 27, 2003 Share Posted July 27, 2003 Well I am jumping off the deep end and building a sbc 383. My desk top dyno is not working properly. What I am trying to do is compare my build vs. new build. current is a 350 4 bolt 30 over 10.3 to 1 comp cams xr276hr 224/230-502/510 with 110 lobe separation 1.50 roller rockers Edelbrock rpm heads 64cc, 170cc runners,1.60-2.02 valves Weiand dual plane stealth intake holley 750 dp 69 primaries and 76 secondary jets msd pro billet distributor msd 6a 1 5/8" hooker long tubes 2 1/2" exhaust New build is a 350 4 bolt 40 over 400 crank 10.7 to 1 comp cams xr276hr 224/230-502-510 with 110 lobe seperation edelbrock rpm heads 64cc, 170 runners weiand dual plain stealth intake holley 750 dp all msd ignition 1 5/8" hooker super comp long tube headers 2 1/2" exhaust If someone out there is bored and has nothing better to do? Could you please run the numbers for a comparison. I am currently getting the part together for the build. I have the block, crank, fluid damper and looking at 5140 I beam rods with arp rod bolts and keith black hyperutectic pistons. Mike Quote Link to comment Share on other sites More sharing options...
Guest Phil1934 Posted July 27, 2003 Share Posted July 27, 2003 I pulled the flow # from the second Edel Perf on http://www.prestage.com downloads. Flow # were bad, so 350 383 HP TQ HP TQ 4000 309 406 332 435 4500 345 402 365 425 5000 371 389 384 403 5500 375 358 378 361 6000 363 317 354 310 Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted July 27, 2003 Share Posted July 27, 2003 my computer only shows these results rpm.........350...............383 ...............afr/crower/edelbrock 2000......151/397.........171/448 ...........157/412 3000......242/423.........269/470............256/447 4000......337/442.........365/479 ...........376/493 5000......405/425.........422/443 ...........473/497 6000......404/354..........396/346...........503/440 but in the real world a 40hp/40ft lb gain over most of the rpm range is quite common btw those heads and cam/intake are holding you back,look at the results for a super ram intake,crower 00471 cam and afr95cc heads Quote Link to comment Share on other sites More sharing options...
Kevin Shasteen Posted July 27, 2003 Share Posted July 27, 2003 .., btw those heads.., are holding you back, look at the results for a.., and afr95cc heads Grumpy, For clearification sake I am assuming your reference to afr95 was suppose to be afr 195: yes/no? I agree that those heads, the 170cc runners will reach their maximum efficiency prior to 383 cubic inches having an opportunity to reach their maximum efficiency. If maximum effieciency is not your goal then you dont really need a 383 and you can get by w/a stout 350 build. If maximum performance is your goal then consider Grumpy's suggestions. I was also thinking cylinder heads w/larger intake runners are more appropriate for a 383: the larger intake runners will delay the point at which maximum efficiency is reached-thus giving your car & its gearing a chance to move the car down the road as this will momentarily delay wheel spin & allow the engine to run in its maximum efficiency...after the car is already moving-remembering that our Z's are somewhat traction limited at times from a dead start. As far as the cyl.heads, intake, and cam choices....I would want to know what your goal is for your car prior to making any changes. Regardless of your need-those 170cc cyl.heads are considered "small": especially for a 383. They're great for a true street 350 or smaller...but not so great for a performance 383. As far as gearing is concerned in any car: more tq/hp will require less gearing while less tq/hp requires more gearing. What are your goals: 1) Pure Streetability/No 1/4 mile time 2) Heavy Street/Mild Strip 3) No Street/All Strip Kevin, (Yea, Still an Inliner) Quote Link to comment Share on other sites More sharing options...
Guest zfan Posted July 27, 2003 Share Posted July 27, 2003 I am currently looking to go street/strip. the current build runs 12.30's and I would like to go mid 11's. I have another cam in my garage, it is a Comp cams xr288hr-10..part#12-433-8. The cam specs are 236/242-520/540 with 110 lobe seperation. I don't want to spend alot on heads. That said what would be better but inexspensive? Iron heads if need be. Mike Quote Link to comment Share on other sites More sharing options...
Guest Phil1934 Posted July 27, 2003 Share Posted July 27, 2003 I went to http://www.edelbrock.com and got better flow #'s. 350 HP TQ 383 HP TQ 4000 307 402 326 428 4500 346 403 363 424 5000 377 396 389 409 5500 390 372 393 375 6000 387 339 379 331 You can see the bigger motor doesn't gain you anything with these heads. The cam is as big as I would care to go with a street cam. I ran these numbers with small tube headers with mufflers. I ran both through desktop drag and dropped e.t. .04 seconds with same MPH. Quote Link to comment Share on other sites More sharing options...
Guest billy383Z Posted July 27, 2003 Share Posted July 27, 2003 Based on my own personal experience, I completely agree with everybody else on the cylinder heads. My 383 currently has World Products S/R Torquer 305 cylinder heads with 58cc chambers, 170 cc runners and 1.94/1.50 valves. I chose these because the KB pistons in my motor have either a 24 or 26 cc dish, (I can't remember which now since I built this engine 6 years ago) to get my compression up around 9.6 to 1. Produces MASSIVE torque down low, but will only go to 5800 rpm (I don't have a rev limiter, the heads take care of that!). My motor is purely a street motor because it is a true daily driver. I drive it to work 6 days a week and everywhere else on Sundays. My '67 Ford Fairlane 500 with 48,000 original miles is an antique and only gets to go out on the street once or twice a month just to keep everything from deteriorating due to lack of use. If I were to use the Z for more than just a daily driver, I would certainly choose a set of heads with characteristics like the afr 195's, and change my cam to suit them. Quote Link to comment Share on other sites More sharing options...
Guest zfan Posted July 28, 2003 Share Posted July 28, 2003 Well maybe before I jump in over my head I should just go with a 100 shot of juice. My good friend said he would buy what I have already put together for the build If I was to score another set of heads what would you all recommend. On a budget of course!!!!!! Mike Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted July 28, 2003 Share Posted July 28, 2003 DELETE Quote Link to comment Share on other sites More sharing options...
Guest Phil1934 Posted July 28, 2003 Share Posted July 28, 2003 Go here http://www.ryanscarpage.50megs.com/combos1.html He has gathered magazine combos from everywhere. You will see all the big numbers are AFR but Canfield good too. Also look at stock head combos. Quote Link to comment Share on other sites More sharing options...
Guest zfan Posted July 28, 2003 Share Posted July 28, 2003 Spirit, 9-12! I could always Ebay my heads for the extra cash! Mike Quote Link to comment Share on other sites More sharing options...
dmanzo57 Posted July 28, 2003 Share Posted July 28, 2003 Here's another option... Buy a pair of AFR 190 heads and Ebay your current heads. Try to get the quench area to about .040" when you reassemble. This should get you into the 11's with your 350 without going broke. Don PS: If you don't already have a line-lock, get one. Quote Link to comment Share on other sites More sharing options...
Guest zfan Posted July 28, 2003 Share Posted July 28, 2003 I have decided to go ahead with the 383 build and will use the Edelbrock RPM heads for now. As soon as I can afford to I will buy a set of AFR 190's or 210's. I am also going to go with the bigger hydraulic roller cam xr288hr-10 with approx. 11 to 1 compression I should be ok with that cam. Thanks for all your imput! Mike Quote Link to comment Share on other sites More sharing options...
DavyZ Posted July 29, 2003 Share Posted July 29, 2003 Wow, now that you have decided to go that route, is your old cam for sale? Davy Quote Link to comment Share on other sites More sharing options...
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