I went to a friend house to talk about the valves retainers clearance problem I am goint to have went the new LUN402A3 arrives ,and he offerred me adeal ,

He got a set of 990 rect. port heads with manley race flow 2.25 /1.88
a comp cam 306-S 260 @.050 .629 LIFT 110 LOBE CENTER ,HE ASK ME TO ASK MY FRIENDS at TC IF THIS PARTS will help my combo.

427 tall deck ,.030 over 10:1 compression

6.535 H rods ,rotating assembly balanced

now 781 with stainles steel stock valves
rect pot RPM AIR GAP intake
xe 268 -280 cam .515/.525 lift

I not sure what deal he wants ,he just ask me to verify everithing will work in my combo,And said to see him tomorrow ,and advise me that I may need to use the metal gasket to get static comp. up :eek:
Any help will be appreciated ...

I went to pat kelly's calculator page and got this #s on compression 10:2:1 using metal gasket .025 .

i would rather keep the oval ports if it were me. if you had like 13.5 to 1 compression and a huge roller in a light race car, i'd say the rec ports.

Is this going to be a street motor or track only?

IT is always at the garage waiting for a few trips ands some track runs ,my ovals still got the small stock valves

I'd stick with the ovals,definately go larger valves,,,I like the first/bigger cam with a little less duration.

i'd be more concerned over the rec port intake on oval port heads, than the camshaft. that's total duration on the cam, i believe. an XE268 is under 230@.050

This is going to be a lot of money and time ,this heads are assembled with big valve 2.25, good retainers and ready to install .

I know you don't like to hear about Ed,M71,but he's running a rectal intake on oval ports...can't argue with mid/low 10's. :D

I am an ED's car fan ,but how or where I can send this ovals to put them in the flow # where ED"s got his ,I even put the ovals reading alot of good posts here ,but this RECT. heads are all done mi amigo and they I know should give some HP to any BB ,you never know ,my brother in law and I just got a 70 nova good combo to try it in .

who said i don't like to hear about Ed? i don't even know the guy. :confused: the only way you can argue about mid to low 10's is if it runs consistant low 10's with the right intake on it. ;) :D
do you have a rec port intake on your car Robert? i don't think you do, so why don't you? but i guess a mild 427 is all Ed has too, huh? but hey if it works on one motor it'll work on 'em all. :rolleyes:

I would't like this post to be all about the oval /rect port dilema :( ,This set of heads will perform better than my actual stock heads ??????

I have an Edelbrock Performer RPM for oval ports on my car Malibu71,the opportunity hasnt arisen for me to change intakes,the motor has been together for 5 years now,and its still running pretty good. When its taken apart it may get the rectal intake on it. Ed has a 468,,,its all about the increased volume that speeds up when it hits the smaller oval port. I'm guessing he runs pretty consitent too,not to many around here have a Wally on the shelf graemlins/thumbsup.gif

Rcatala,when it comes to building an engine,there is such a thing as too much. If its built to handle the large heads,and you're going to turn the RPMS to handle the larger heads,by all means put them on. The oval ports are a great street/strip head that build plenty of torque.

ain't nuthin but a couple hours at most to change Bob. you do want to go faster don't you? waiting until you tear the whole engine down, just to do an intake swap? if i thought a minor change like that would benefit me i'd be doing it at the track if i had to. ;) :D
rcatala....if you're just wanting someone to say it's ok to put the rec ports on there, then it's ok. but they WILL NOT run better than properly equiped oval ports for your particular combo, IMO. but yes, they will work. you'll lose some bottomend and midrange with the rec ports and probably make about the same peak hp but at a slightly higher rpm. ;)

At this time I don't want to go faster,been warned at the track already about needing a rollbar. Ask me next year,I just bought a .030 over 454 shortblock with 781 heads. It will be faster and the rollbar is coming.

OK ,But for now a would take this offer and install them since a do not know how to port a set and it got to be all paying ,I stay with the rect. they now would flow better than my stock ones ,and went the AFR OVALS COME OUT next year or so it going to be my choise ,I know ovals flow went they are properly done but my don't flow well with the stock valves .so this is a fast upgrade

wish i had a nickel for everytime i heard the ole, "wait till next year" line.
:D
ps i'm just rattling your cage a bit, don't take it personally. ;)

:D I did some search and thats the latest ,6 or so months to complete the AFR work .web page (http://www.chevelles.com/cgi-bin/forum/ultimatebb.cgi?ubb=get_topic;f=4;t=017919)

Originally posted by rcatala:
I am an ED's car fan ,but how or where I can send this ovals to put them in the flow # where ED"s got his ,I even put the ovals reading alot of good posts here ,but this RECT. heads are all done mi amigo and they I know should give some HP to any BB ,you never know ,my brother in law and I just got a 70 nova good combo to try it in . Send me an email, i'll refer you to the guy who worked on Ed's heads.

I set a deal ,I hope to bring the heads home soon . graemlins/beers.gif

rcatala,good luck with your project..keep us posted..do you have an ET goal?

I don't think Javier wants to ship them stateside and spend another $700 on those heads. I'm guessing though.

The prepped ovals are best, I'd have to say the difference between small valve ovals and big port done heads is marginal.

Javier, if you change you mind later and want to use the ovals, feel free to email me.

I got the 990 with 2.25/1.88 Manley race flow valves a 3000 turbo action converter A SOLID cam 306S ,.629 /.629 LIFT 110 CL INS AT 106 ,with a set of rect port spacers too TO USE IN MY TALL BLOCK .all for $600.00 .WHAT CAM WILL be best still 274/286 Harold's cam from Lunati ?)??

I have the 276/284 solid with rec. on my 454. I love it graemlins/thumbsup.gif . You will like it too. You are going to want 9.5 + compression. For the deal you got I would not hessitate to run them. Yes, like everyone says ovals will run better. With me it is the difference between melting the tires at will and lets see :rolleyes: , oh yeah melting the tires at will. Sounds like what matters for you is the smile factor. You will get it. Later if you are trying to sqeeze everything you can get out of it( and if you can hook it up ) you might try ovals. Bottom line. Have fun graemlins/beers.gif

Go for the req. Port Heads. I got them on my 502BBC and i have had ovals on there and i changed to Req. Port heads and i wont go back. You loose a little low end but with a big block there is to much low end and the top end comes in like gang busters much better than ovals. Just Depends on what u want and are looking to rev the engine to. Nothing better than your friends seing the Req ports and see they can loose there tools down in there...

Sugarwolf,just curious..does the car see any track duty? Any timeslips to compare between ovals vs. rectangulars?

Yea the ovals were not flowing enough for my 502. Specs are on my 502 are Gen 6 Block. Forged Crank. H beam Rods, 11:1 Compression Trw Pistons, Gm Aluminum Req Port Heads, Comp Cams Hyd Roller Cam Specs In.623 Exh.623 Dur.In.250 Exh.250 LBA 110 Deg. Edelbrock AirGap manifold. Mighty Demon 950DP. Th400, 3500rpm Stall. 3:73 Gears. Engine Runs Great On The Street. The Ovals I had On Them pooped out at 5200rpm Then I put On the req Ports and pulls hard to 6500, They actually helped me on the track since some low end was lost so i dont go up in tire smoke. 10.7 at 129mph with Req Ports And With the ovals 10.9 at 126 So i lost 2 10ths going to Req. Depends on the engine and other variables. You dont see 8 sec cars with ovals Just dont flow enough for the big 502+ cubic inch engines. Explain why the 375hp 396 had req port heads and produced more power than the 325hp 396 with the ovals.

Sure, 11 to 1 CR. vs 10.25 to 1 CR. and a 242 duration at .050", .500" lift solid cam vs a 198 duration at .050", .398" lift hy- cam so next time pick apples against apples imho..

Not to mention big valves vs small valves!!

pdq67

502rat..can you post your incrementals from your time slip?
I`m wondering why your ET doesn`t match your MPH.

I guess as long as NEW PEOPLE continue to join this site the same old arguments will keep coming up! graemlins/angry.gif RECTANGULAR PORTS VS. OVAL PORTS, ALUMINUM VS. CAST IRON, BLAH, BLAH, BLAH!

Rod

maybe they were the peanut port ovals? i don't understand why they peter'd out at 5200? i had 049 oval ports on my 454 and i shifted it at 6200 but it would blast up to 7200 on the street with radials on it, before i could back off or shift the darn thing. did you use the same cam, lifters, and valvesprings?

You dont see 8 sec cars with ovals Just dont flow enough for the big 502+ cubic inch engines. Ummmmm,I beg to differ,,,Pro Stock cars are using Ovals at 500 cid,granted those ovals make stock rectal ports look small,but they are oval ports. :D With your mph you ought to be in the mid/low 10's :confused: I'd like to see the incrementals also graemlins/thumbsup.gif

Some bad@ss oval ports here! (http://www.steveschmidtracing.com/ssr_010.htm)

You can order oval ports for 4.900" bore spacing.

While many things are more important than flow numbers, Unported these heads flow 518.5 cfm.

I had the same problema I can not rev my motor over 5100rpms ,I though it was the valves springs but took the 781 yesterday out and verify the springs pressures and the were OK. I did't post until now to be sure of the pressures ,but 502 rat ,Did you change cam with the heads ??
I was thinkig maybe the xe268H it was to small for my combo and the XE LINE close the valves faster than others (that what COMP CAMS said )and that can be the problema in my case ...

Not revving over 5100 has nothing to do with the head castings,,,781's/049's will do 6500 easy,,,there's more to the story,,,,springs,small valves,cam,fuel delivery,overall motor condition to begin with, DO NOT blame it on the oval port casting,because that is NOT the problem. My 049's are stock,no porting,2.19/1.88 valves,and they go 6500 easy with 548/559-232/236 Lunati solid graemlins/waving.gif

Javier, you'll be fine with the rect ports. For sure fully machined up ovals WILL WORK BETTER and give you a quicker ET. All these guys talking about 502+ size motors and ProStock have no bearing on what you are doing. Use the rect port, which I assume you already have traded for.

In my case with a smaller motor, and a stick shift, ovals, as far as I can figure, might be worth .10-.30 in ET. Since I don't bracket race my restoration, who cares? The car runs just as fast, if not slightly better , than most similarly outfitted stick cars with oval heads. So what is the big deal? Spending $800 on some GM oval castings would make it go slightly faster ET wise, but I don't think the mph would increase.

Bottom line, it's OK to run rects, although it is defintely secnd best to fully prepped ovals. PREPPED ( read $600-800 worth ) ovals would defintely be quicker for most heavy, mild gear rides. I don't know how much though. Some here have done the swap, but I think they changed cams as well, so we can't tell.

Just do one thing, make SURE that new UD cam is put at the +6 advanced setting like Harold recommends. I can't explain why, but when I spoke to Harold two years ago on my setup, the advance in the cam would really help flow velocity, particualry in the big 320cc rect port head.

And guys, Javier has a 454, NOT a flippin' 510. So in the future make sure your head comparos are relevant to what is being asked. 4.5" bore at 6500 is different than a 4.25" bore at 6500. So the comments about anything bigger than a 454 are IRRELEVANT here. At least my example is smaller than Javiers.

But one thing is true, oval or rect port, man you can smoke them at will.

Oh, lastly, Javier, make sure those 924 springs are shimmed up like I said. With this cam and those heads you'll have the motor to 7000+ before you know it. And the pull between 4500-6500 is going to be TREMENDOUS. We don't want any valve float here.

Oh yeah, any of you guys know what it costs to ship ONE 75lbs head from PR to the east coast?

He's looking at $1000 with shipping. FOr a bit more he can buy new alum heads or new modern iron ovals for the same bread.

ROBERT ,I did not blame the heads just an tought if the problem most be the small valves with a small cam closing fast . But I do like the way it works still.

GENE I got a 433 427 + .030 ,AND ABOUT HAROLD''s cam SUMMIT ask $225 + s/h I call them yessterday after I took the springs pressures .WOW that alot .but they tell me about a CC XS282S ,I JUST WANT TO ASK an saw a Harold comment about this cam to a guy he said it is racer1320 claiming to have the same grind ,and HAROLD AS ALWAYS BEEN A GENTELMEN TELLS: "DO YOU REALLY THINK ALL 110lbs. BLONDES ARE THE SAME????"
the cost of the cam is it really low compare to the lunati ,but that is the cam you get a fast production cam .cam spec.

XS282S-10
VALVE ADJ.
IN.016 ----EX .016
GROS VALVE LIFT
IN.59/EX.598
DURATION @.015 282IN/290 EX
VALVE TIMING AT .015
INTAKE OPEN 35/CLOSE 67
EXHAUST OPEN 79/CLOSE 31
AT 106 DUR.@.05 IN 244/EX 252
LODE LIFT .347IN/.352EX
LOBE 110
AND THE VALVES SPRINGs ARE 924 .allready intalled on the rect port heads.

Haven't read all the posts, but there is more than one way to build a motor.

There was a good racer on these boards running an oval port cast iron motor (Ed Bigley) and his BSE combination. Here is his bests that I know of.
60' ET 1.36
1/8 Mile ET 6.53
1/8 Mile MPH 103.78
1/4 Mile ET 10.37
1/4 Mile MPH 126.90

I am running a rectangular port motor with aluminum heads. Granted Ed got a couple extra cubic inches and I believe I have a little more compression here are my bests.
60' 1.39
1/8 Mile ET 6.43
1/8 Mile MPH 104.8
1/4 Mile ET 10.64
1/4 Mile MPH 125.85

With my recent 1/8 mile ET, I should be in the 10.15 time zone.

So with that said two different people built motors different ways and came up with almost the same results. Build it the way you want to build a motor

Javier, call Lunati directly. I have no idea how the XE cam compares to the one you want. Alot of folks use them successfully. All I know is that in my rect port STREET 427, the UD/Lunati 276/84 was a pleasant surprise, making a bit more power than I imagined.

Yes, I consider the CC shelf cams to be very good cam's but for that "little bit more", call Harold at Lunati's!!

As Harold said, all 110 pound Blondes are not the same!!

I never thought about that in relation to cam's but it fits!!

pdq67

PS., I have never tried to max. out a motor but do know where guy's are coming from that want that last little bit on the table, that's why I usually am conservation with cam selection, that's all...