Having my 461 stroker engine rebuilt with a pre 73 block because of problems with the 500557 block. Since it is being torn apart looking at changing the cam as I have not been impressed with it's performance. Here is the info on the build pre 73 block bored decked and ground for eagle stroker assembly. Head Edelbrock 86cc D-port aluminum (10 to 1) compression. Comp Cams 1.52 ratio roller rockers.7/16 studs 9.200 long push rods. ProComp intake manifold ( I know that I should use a performer RPM manifold but I don't have the hood clearance as this manifold is 1.5 inches taller) The cam that I previously used in this set up is. a Comp Cams #51-223-4 Specs-(224/231 @ .050 with .477/.480 lift on 110' LSA) I would like to get more performance from this engine and am looking at using the Comp Cams xe284h cam (mainly because I have this cam in my possession) Anyway the car is a 1980 trans am with a tci super street fighter TH-350 transmission with a 2400 stall converter. I am going to need vacuum for the brakes and not sure this cam will work for that. any suggestions on a better setup? Thanks for all your comments on my previous threads. Going to get this damn thing done right one of these days.
hi;do you want a drag car or fwy flier or inbetween?mild moderate or nasty idle?here's some suggestions.ok, if you have a 455, the xe268h cam you had is lame.the xe264h might be a bit much to give you vacuumadvance it 4 degrees with an adjustable timing set and buy a vacuum reservoir for 49.00 and it will work with your stall converter and have enough vacuum.i might sell it on ebay and buy one of the following.comp xe274hlunati voodoo 276 duration, p/n 60203 my first choice.you will likely need at least 3.43 gears.throw the chinese pile away or give it to someone you dislike immensely and buy an eddy non rpm and put a 1" spacer on it or similar manifold.buy an annular boost venturi 750 vacuum secondary carb and install the white secondary spring.hold on to your seat.start with around 12 degrees initial timing.32 degrees total all in at around 2600 - 2800 rpm.vacuum advance set to add around 8 degrees and connected to ported vac not manifold vac.MSD 6AL-2 box.hold onto your seat.
I've read that the steep ramp cams, like the CC XE series and the Lunati Voodoo series were designed to increase the cyl pressure in low comp engines. Your 10:1 stroker should have plenty of cyl pressure.You can use a cam with more advertised duration. The smallest cam I would consider for a 455+ Pontiac is the 041 RA4 grind. They'll make well over 500ft lbs of torque at around 3000rpm. We ran 'em with Rhoads lifters in our 455 bracket cars. They idled smooth at 800rpm, and left the line hard with stock 13" converters. But with that much low end, I don't see how you could ever hook it up with anything less than drag radials. Hard street tires don't have a prayer.If you wanna try one of these, all the big cam grinders have a version of it. The CC # is 51-116-3. The Crower # is 60919. The Lunati # is 10511003, and the Melling # is SPC-8. Ebay usually has the best prices for the Melling.http://www.summitracing.com/parts/cca-51-116-3/overview/make/pontiachttp://www.pontiacstreetperformance.com/psp/rebuild455cr.htmlhttp://books.google.com/books?id=O--NmlNfSYwC&pg=PA126&lpg=PA126&dq=crower+60919&source=bl&ots=AIauqvach-&sig=fNSyOtj5oyL5BcfQQ3hCDqwmde0&hl=en&sa=X&ei=23iVU5O3JZObyATslIGQDg&ved=0CI4BEOgBMAg4Cg#v=onepage&q=crower%2060919&f=falsehttp://www.popularhotrodding.com/enginemasters/articles/pontiac/0501em_heads/http://www.summitracing.com/parts/CRO-60919/http://www.race-mart.com/Lunati-LTI-10511003.htmlhttp://www.summitracing.com/parts/mel-spc-8/overview/http://www.ebay.com/itm/like/251544595790?lpid=82I suppose Jim Hand is the 1st guy to really prove the 041 cam/Rhoads lifters combo and publish a widely read article about it. I realize that there are a lot of 21st century guys who don't like any of the old school stuff, but the 041/Rhoads still works, regardless of what anybody says.http://www.bafb.org/1968firebird.org/jharticles/jharticles5.htmThere are a LOT of cams that are MUCH bigger than the 041. And with Rhoads lifters some of them will still make decent vac.http://ronspontiacpage.com/reference-pages/aftermarketcamspecs.htmYou can have a cam custom ground to your specs. Here's a few lobes that are available.http://www.bulletcams.com/Masters/Hlobes.htmhttp://www.compcams.com/Technical/FAQ/LSAproperties.asp If you want 500+ HP go with a roller. SD Performance has a nice cam they call "old faithful" that a lot of guys like.http://www.sdperformance.com/viewProduct.php?productID=1816
i am a comp cam dealer and have been since they started the company. i have also used and liked other brands sand were dealers dor others too. an xe or voodoo [steep ramp] cam will not increase your cylinder pressure to a point where you have detonation etc. and the xe284h will likely LOWER your compression. this is because, in general, the "bigger" the can, the later the intake valve closes. the later it closes, the more cylinder pressure that is allowed to escape. this is why the "bigger" the cam, the more compression you need. this can be seen in every cam mfg's cam description.i would not suggest rhoades lifters. only a very small percentage of people use them and only for a certain app. it is not the norm to use them. i prefer to "keep it simple.".there is a member here that runs the 041 cam at 4 additional degrees of advance in his 67 428 gto with around 9.5 compression and around 3.23 gears with std 4 speed. he says he has so much bottom end that it spins the tires excessively even with traction bars. he does not use rhoades lifters.we all tried to get him to use a different cam that would have worked even better for his app but he just loved the thought of running the 041. the 041 is also designed for a high compression 400. it will certainly work in a 455 but the extra 55 cubes you have will make it seem smaller than it would in a 400 ci engine.the 041 is also designed for heads that flow much less than yours and it was designed 46 years ago.
Ok. but you never really said what the xe248h would do in this engine. Will I have enough vacuum for the brakes and is it a good choice. My engine builder is claiming 510 hp and 580 lbs. torque. I am looking at about 50% street time and 50% track time with the car. I want this engine to impress me. before I put this engine in the car I had a 68 400 I built with stock stroke. that would push the car through the 1/4 in 12.55 sec and at 99 mph. in my opinion it would of out performed this stroker engine so performance and the holy *** factor is a key issue. So are you recommending the 041 cam.Thanks. Wally
hello;GOOD CHOICE - You need to answer my questions in a but more detail first or i have no idea. you might want more or less hp than someone else. i seriously doubt you want us to guess what you want and make recommendations on our guesses. if you run that cam you need 3.73 - 3.91 gears. these are not great for the fwy. ENGINE VACUUM Unfortunately it's not quite that easy. we all wish it was. you would need to contact comp or someone with a desktop dyno 2000 system with full program options to be more certain. i know it will be close if you advance it. if you do not i would say it will likely be less than 15.if it is less than 15 at idle the vacuum can will still stop the car.i would say that if you don't drive like john force or any granatelli, i would run the lunati 60204.the moderator has some graphs done on the hp with this cam. i will post them if i can find them.HOLY *** FEELING - You ain't gonna get that with enough vacuum at idle for power brakes. these two things are mutually exclusive and again, i would not run rhoades lifters but they will help increase vacuum by maybe 3 hg which may still not be enough. you are also limited in cams by your intake due to hood clearance. you could run a torquer II but it will cost you some bottom end.http://www.summitracing.com/parts/edl-5056/overview/make/pontiacif you want the holy *** factor run that cam straight up with around 10.5 static compression on 93, if you run race gas then run around 11.5.have your heads ported.run a 750 cfm 4500 holley mechanical secondary.http://www.holley.com/0-80186-1.aspcomputer dyno433 ciCam lunatic voodoo 60903Carb 850Dual plane intake.500 lift, in 263, ex 198.600 lift, in 281, ex 208Hp 441 @5500Tq 490 @ 3500Page 9http://forums.highperformancepontiac.com/70/8747136/the-general-discussion/dawnas-406-433-build-a-tribute-heaven-can-wait/page9.html041 CAM - Not me.510 HP - 580 TQ - Where did he get this from? I think it might be optimistic.
i agree with shy on the xe284 and power brakes. i run a custom grind hyd roller in a 461 with the 87cc eddy heads ported. it is 230/236 at .050 lift 481/535 1.5 i run 1.65s. power brakes are fair with a leaking booster! in a 69 grand prix with 3.42 gears and a 5 speed i ran a 11.99 at 112. left at 3500 rpms. 1.75 60' small carb! i now have a holley 850 hp annular carb may try to go to the track friday night to see if it runs any faster!the 041 will also run great use 1.65 rockers for more lift if your springs will take it!
76 455/4spd TRANS AM69 GRAND PRIX 455/5SPD
hi rowsley;so you got an annular 850, wow. was it an arm and a leg or just an arm?which one is it?have you driven it yet and if so have you noticed any difference in throttle response etc.?