Last run of the season I blew a lifter to
he** & I pulled the engine on Saturday
for a look thru, like everyone else I would like
to get a little quicker without spending
thousands & would also like to keep this engine
a pump gas ride & not bore it. Any one with
knowledge, there help would be appreciated.

69 Chevelle weighing 3780 with driver
454 compression 10 to 1
Crank 4 in stroke/ standard bore 5140 steel
Merlin Rectangle port heads/ open 219 in 188 ex
Lunati cam part 50231 680 in 700 ex grind 258-268
solid roller Duration 296in 304 ex Rockers 1.7
Pistons TRW 108cc open
5140 Rods 7/16 bolts
Intake Victor Jr.
Holley 950
Coan 10 in 4500 stall
Turbo 400
4.56 gear
2 1/4 in headers
MSD Ignition
10X 28 MT
Best 60 1.49
Best pass 10.96 at 123.9

Thank you Larry graemlins/waving.gif

Larry, I think you have a good combo as is. That said there is always room for improvement. Running 10's with heavy 3700# and driver is excellent. I would try and cut some weight but that only for a strict race car. Doors are heavy and perhaps some wt cut out of crossbars etc, in the doors. I mean to do the same with my Camaro and here that 50-60# !!! Heater, Windshield wiper motor, backseat, pass seat are gone. That a big cam for the compression but again to keep it pump gas I would leave it alone. Good molly piston rings-file fit, Clevite 77 bearings and your good to go! With your 60ft. time I assume that you have some good suspension on your car! My chassis guy says to keep new slicks as they deteriorate. Goodluck and see ya at the drags! :D

Thanks Blazer for the comments just thought
maybe with new technology & some of the great
minds around here I might be able to get better.

Yes Larry, there are great minds here on TC! Just stick around, they'll be coming out of the wood work in no time! HeHe! :cool:

That's alot of cam for only 10:1. Until those great minds appear, you might ponder whter shifting the whole operating range down 500 rpm or so wouldn't make it even faster. ????

Or raise CR. You can likely go 11:1 and still run on 93 octane, easy in fact

Give those great minds something to mull over...good luck, sounds like a real fun ride!

btw, my peek at that 69 was FORBIDDEN! Damn!

Thanks 427, I can't get the picture right
but you can copy & paste & see it.

More compression and a 29.5 tire!!!

Bump

Bump one more time

I have the same cam, but 781 heads and I love the way the cam pulls. I run a 1.7-1.8 6o time and my best et is 11.27 at 123mph. You are the first guy who has the same cam as me to post on here. I should also add the times I have posted are from the previous owner, I have only street raced it. Lunati said this cam is less aggressive than some of harolds ud cam profiles when I was wondering about its streetability. I am going to put some isky red zones in it this winter to be safe and maybe some springs.

The Lunati 50231 is one of their "good ol' cams", having been around since the early '80's, if not the late 70's.
My question is how many passes/miles did it go, and what was the spring pressure, particularly after the failure?
I know nothing about this cam's reliability, only that the numbers look reasonable for a moderate cam.
Any roller cam becomes more reliable if you can run a tighter valve lash, and still have enough bottom-end.
Let me know some more information....

UDHarold

Harold I had about 160 passes on cam, lifters & springs & after further review the cam is
scratched pretty good, I'm not sure of pressure.
Do you have any suggestion's on new cam, this car
see's little or no street driving. I sincerly
appreciate your time.
Larry

I am glad to hear your opinion on this cam, I believe I talked to steve on the phone, he said the same thing, nice to hear the same opinion from you. I primarily run on the street with my car, but the other owner said it didn't have 1000 miles on the engine, I have put at least that many on it. Mine was built in 1997, so I know it doesn't have the new style lifters in it so I am going to get some from wolf and get them in before spring. I will tell them to lash it tight cause I have plenty of low end with my gearing.

Yea good to hear yur comments Orange just watch
those lifters & unless someone can tell me why
not to I'm going to put Crower hi-po or Isky
red lines back in mine.

I would get ahold of wolfplace, guess he has good deals on the isky's, as for another cam I am sure harold has some newer grinds that are better. When I talked to steve he recommended that I go to a cam with slightly less lift and duration, I think it was in the 250/260@50 and 630 lift, but since you mostly use yours on the track I would guess they will tell you something different. I see some feel we don't have the compression to run this much cam, but boy, my car runs and sounds so good I just don't want to take the cam out unless we see something wrong this winter when I get it apart. Well have a merry x-mas.

CHITOWNHUSTLER,

With your converter, rear gear, and CR, use my 502A5LUN. I have used the intake lobe for 23 years as both a race cam and a street cam. It is one of the most popular race lobes I have for the BBC.
The 502A5LUN is 286/296 at .020, 255/263 at .050, .685"/.680" valve lift, and 107 LSA. The cam is ground 4° advanced, and I run it anywhere from 100° to 103° int CL. Give it lots of fuel, and be prepared for hook-up problems.
It is a different animal from the 50231......

UDHarold

In what way is it different from the 50231? More mid range? would it work better for the street or is it a better track cam? I asked about switching mine to something less aggressive and they told me the 50231 isn't too bad. I think that is the cam steve recomended also.

My son used a flat tappet cam in his 482" that has a usable duration similar to what UD Harold is reccommending and it flew. The roller that followed it was about 10 degrees longer in effective duration and didn't make the car one bit faster. It ran 10.60 all the time and had a best of 10.48. He had quite a bit morecompression than your combo though.

orange2,

The 502A5LUN definitely has a lot more mid-range, and more top-end also. It is more a track cam, although I have had people drive it on the street starting about 1984. Racing-wise, it's not uncommon to get 300-500 9- or 10-sec passes out of a set of springs, even with less pressure than yours. I used my 936-937, same as the Lunati 70237(I think that's the right number...), which was 210 lbs at 1.900 and 525 lbs at 1.250, and they lasted for several years on the track. I used the same spring on my daily-drivers.
If you want an ultra-reliable cam to last for years and years on the street, and are happy with about 640 BHP about 6400, use my 502A2LUN. It has 290/300 at .020, 255/264 at .050, .630/.630 valve lift, and 110 LSA. In 2 SBCs, it has finished the 24 Hours of LeMans, without a single broken valve spring. I have had people drive it for 10 years on the street, but I do not claim they were all on the same set of springs.....

UDHarold

Thanks harold, my car is totally a street driver, but I got the car to drive it like it is meant to be driven, hard. I will have to give that a2 some thought, sounds like a winner, is it really much better than what I have?

orange2..if you don`t mind,can you post your set up in detail?
Looks pretty stout.
Love them 70-71 camaros graemlins/thumbsup.gif

Well I bought the car built already, here is what I know. 454 30 over, 781 heads fully ported which flow around 310-210 at .7oo lift 2.25-1.88 valves, victor jr with a worked over 830 holley, crower roller rocker, 4 bar stud girdle, kb 207 hypers 10.25 to 1, steel crank, i believe truck rods but not sure, 2.25 in hooker headers into 3 in. flowmasters, hays flywheel, centerforce clutch, st10 with 4.56 gears. I talked to the guy who built it and it will pull the fronts about 6 inches with 29 in slickes. It has frame connectors and a 6 pt cage and a shock relocation kit (not sure what the heck that means. a holley blue with 1/2 in fuel line bg regulator set at 8-9 lbs, a griffin 4 core with dual electric fans, no power steering or brakes. the car did have a ported dart intake and a 1050 holley on it but was taken off, so it may not run the numbers I have posted, but on my gps it will run 118mph in the quarter on street tires spinning along ways. the heads were done by Iselin racing in Omaha neb. and the shortblock was done by Charlies machine in Omaha also. The guy shifted a around 7000 rpm, the motor is suppesed to be all balanced, and it runs very nice. Starts easy, idles at a nice tame 12-1300 rpm and just sounds neat as hell. I used to have a 79 vette with a mild 454 and thing thing is just wild compared to what that was, I love it. the car is black with weld draglites and a 4 inch cowl hood.