I guess this question is not for everyone .. I guess more the professional engine builders on this board. On our comp stuff we are running big compression--It doesnt start to make any real power until we get past 16 to 1 . I know the 455 has limitations but with the new block and an efficient chamber( I guess the stage 3 or 4 stuff--Ive never seen it) who knows . What diameter spring will those heads take? Any way, with a 55 mm cam tunnel , some more aggressive profiles than what is out there, are you guys thinking going big numbers are in the future--900 plus NA? How much compression are your fast guys running ? This board has got me thinking 10.5 in car... Just wondering. George
George I use a 1.550 spring on my Stage2 heads but that is with the T&D rockers that mount in individual pairs,They use a smaller shaft and a Chevy rocker arm which allows for more space than the OEM rockers. In talking with some guys at an NSCA race this past year(I ran "Real Street" for the fun of the pro tree) they are getting up there in compression.....There is a real Pontiac 515 CI that a guy runs in the class,His motor made 1020 on the dyno with 17:1 CR,Single Dominator,I'm not sure how good his heads are(They're Wenzler's)but he does have a 55mm cam,And all the other ''good stuff''. The car is 3350lbs and has been 8.7's at 155+.....he used a powerglide and even a pro-flite a little this year,He said the flite was worth .08 I also believe he said the motor sees 8500 or so.
We are using a 1.660 spring on my heads but we had to run a inner spring locator rather than a cup if we would have cut the pockets to accept a cup we would have blown a hole into the exhaust port.I am running a Jesel rocker once again like Gary's it's basically a sbc rocker arm.This is the only way to run a tall installed height large diameter spring. For compression we will be in the 15-1 range if I continue with the nitrous combination.I don't think I'll need to run any more than this.The nitrous will add the needed cylinder pressure. On motor alone I should make around 950-1000 hp @ 8000 rpm.I don't know if my heads are going to be good enough to make 1500 hp on nitrous.The heads flow very good but the port volume isn't there.At this point I am considering a centrifical blower or turbo.Going this route port volume isn't that important and big hp becomes easier.There are a few deals in the works but Ive got to look at the whole budget and make sure it's possible for this year. o No:
I know it"s not a buick but a mopar guy up here in victoria has a 540 B1 with a single 1050 and 15 to 1 the cam if I can remember right is .850 and 290 306 @ .050 and when this thing went to the dyno there was a lot of sceptics that said no way it could make over 1000 h.p. ( this was about 5 years ago when single carb motors werent making that kind of power).well it made 1030h.p.!!! this thing is in a 3500 pound cuda with a g-force 4 speed and runs 8.80s at 150 plus.when looking at the v.e. numbers from the dyno sheets it was over 125%. I guess that is why it could make those numbers with less than 400 cfm of head flow. some of those mopars are impressive this thing is very cool to watch go down the track but still not as cool as our buicks!!
I see I am not the only one thinking about it... In my area the true 10.5 guys are going like 8.20s and 30s and the 10.5ws are some of the fastest guys in the country --going 7.50s or better. Locally if I could put together a 8-900 hp true buick deal and spray it and be close @ 32-3300lbs... hmmmm unless one of you guys beats me to it !! Is that SPX manifold big enough? now you guy really got me thinking -- lets see Ive got the spare Liberty... George
if that spx isnt you can adapt a indy or b1 chrysler intake fairly easy and have next to no flow loss. i flowtested my stage 3 heads with a indy manifold and the manifold kept up 98% to the head.
I had CFE build a sheetmetal tunnel ram setup for 2 doms.I don't like any of the current buick intakes and the time we spent making these heads flow I didn't want to kill them.I looked at a Indy intake and a b1 but decided to empty the wallet and go all the way.A naturally aspirated buick will make 1000 hp with what we got for heads.The block was the limitation now that we can put a real cam in the motor and the block isn't trying to shed parts we'll see what we can do.The pontiac guys are making big hp with heads that aren't close to what we've got,even the wenzler super chiefs aren't that great.They are also limited to around a 4.380-4.40 max bore.If they can do it we can.They even have a few nitrous guys in the 7s.
I aggree 100%. To run true 10.5 you need a cast intake though.This new block is what has been missing I can see that . I have a new Wilson sheetmatal coming for my drce stuff for '05. In my shop it is within our strike zone to do a 10.5 w skylark (3/4 car). Then you can do any intake . You know that the "Worlds Fastest "stuff is getting out of hand . I have a buddy who has a true 5 inch bore space 706 EFI 2 stage in his 3/4 chassis 3500 lb firebird. He went like 7.40s in Orlando and was in the middle of the field. It might be a better choice to stay small tire and race the turbo small block fords. Hey has anyboy run the Stage 4 stuff ? George
Gary , Great looking leave with your Buick...do you use double adj. Afcos in the raer? Also do you use double adj. Afcos up front? Thanks Milan
Hey Milan Rears are Double adj. Fronts are still the "old school" Koni's with Moroso springs. I did see that AFCO is making what I understand to be a ''bolt in'' frt shock too......It's worth looking into for me to better control things through the middle and top half of the track.IE:Less bounce,Frt end height.
In Pro and NSCA SS your allowed a sheet metal but take a weight hit.This is what I built my car for it's a 3/4car.Looking back I would have been better to stay with a true 10 wide I could compete easier gotta have a ton of hp to run with the big guys. My heads are basically stg4s we moved the pushrod over etc.If I had started life with a 4 life may have been easier but starting with the small port allowed us to shape the port to suit our needs.Back to the intake if you are going to run a cast intake use a dodge piece most likely a indy the port sizing is closer than a B1 which is huge.
the indy 440-1 is almost a perfect match in size to the buick head.The thing I like better about it is that its taller than current buick intakes and has nice tall runners with lots of volume and good taper down to the head that spx looks too much like a torker 2 to me but I guess that was so it would fit under a stock hood.I wish someone would step up and make a real good single 4 cast manifold for our buick stuff.
10.5! I'm all for the 10.5 cars! Lets see 'em! As for the intake, I'm sure we will see one in time. It would be nice to see Edelbrock build a Super Victor or enyone build something equal to. If they build it I will buy it. On my compression, I'm on the low side at 11.6. I will be staying low even with the change over to the new block. We'll see how it works out for me with the nitrous.
