Doc, I'm on the fence right now before I complete my build in regards to a cam. I'm being informed that with the mods I am doing I might be leaving a lot of torque on the table with the Isky cam that I have. THe mods are 425 bored .30, 1966 q- jet mainifold ported, 800 cfm q-jet, ported heads, ported exhaust manifolds, 12" st300 converter 3.23 or 3.08 posi. It is a stock cam but a lot more than it has to offer. Still looking for economy and highway trips.
Snake your cam will most likely work great. Found a few old threads to look at will you are waiting for Doc:TU:
Snake, that Isky cam is a little bigger than both the late 401/425 cam and the dual quad '109' cam. Stock cam had about 0.440" lift, 209 degrees duration and 114 lobe spacing. The 2x4 cam had a tighter 109 degree spacing. Your Isky cam will still have great low-end torque, but you won't have as much top end power as a bigger cam.
you can grind your own 091 but even better. stock 091 was a fast ramp in its day, with 209 duration @.050, with only .440 lift, now add a little more duration and a lot more lift on a 109 LSA, you will have a modern 091 cam. which way do you want to go, smooth idle and gas mileage or more performance.
TA performance now has available roller cam cores for Nail Heads,much better than any flat tappit cam.
So where is Doc? He shoulda been all over this! Gonna have to throw out some Doc Bait..... Holleys are the worst carbs ever! Fresh air intake is over-rated! Run lots of weight in your trunk for traction! That should do it! He'll sense a distrubance in the force any minute now!
Who in the world let that Rhett character out of his cage??????:eek2::eek2: just reverse everything he just said and you will be fine....:Smarty::Smarty: Actually ,,, poor ol Rhett cant help it, he has been brain washed :Brow: by TOM .... There were really 2 of the 091 cams available a early one and a later one,,, both with the same number... the early one had the 109 lsa... which gives it a little rougher idle... that is the reason that buick changed it.... customers were complaining about the rough idle.... I had the old original 091 and it performed very well,,, it ran good,, pulled strong,, and did not run out of wind untill you got above 5500... and would actually go to 6000 but by then it was just windmilling... and not making any more power,,, that was on a engine that had vary little done to the heads, a stock intake (no doc dual plane) a holley 950 three barrel, cold air intake... m/t headers,, recurve dist.... and dual exhaust....and a sw. pitch th400 with 4.11 gears..... the gear you have behind a engine makes a big difference in how a cam works or dont work,,, if you put a big cam and tall gears, it aint gonna run till you get to 35 or 40 mph.... this is why I am always saying ''dont over cam it'' or conversely, dont under gear it.... A all out cam with 2.93 gears dont work out too good,,,, but a bone stock , grocery getter cam , will run very strong , for what it is , with a set of 4.11 /4.56 / or 4.88 gears behind it.... in its class, in its class, a pure stocker with a stiff set of gears that just peaks the engines max rpm at the finish line, will win consistently.... now,,,Where is that Rhett ???????:Brow:
And now all is right with the world. Hadnt seen ya Doc, so I got concerned. I take it all back, for the time being!
That's funny Rhett! I have to add one to that: "The 091 cam is just a STOCK 425 cam!:bla: There was only one '091' cam. But it looks like some other cams have the same or similar specs. The '091' cam is Buick part number 1368091. Used on 1965 425, and 65-66 425 2x4. Similar cams (same specs), pn 1362241 and 1358100 were used on 63-64 425's And another, 1185918, was used on 59-61 401's. This one is advanced 4 degrees. See the chart written by Dennis Manner here: http://www.v8buick.com/showthread.php?30928-Post-your-Cam-Specs!&p=1689830#post1689830 Doc, I wish I had one of those '091' cams to put a dial indicator on and see how it REALLY compares to it's milder replacement with the 114 degree lobe spacing. I'll agree the '091' 109 lobe spacing should give better performance.:TU:
HUMPH..... i dont pay no attention to stuff like that unless I step in it......:Brow::Brow::laugh::laugh::Brow::Brow: all, i know is I put the ''hotter'' version in my car and it really performed well.... big holley and all.... and it definitely had a different sound and feel from a ''grocery getter'' cam..... and i did beat a bunch of cars that were waaaay out of my class.... both on the street and strip.....
I would of liked to try the 091 cam with the 109 lsa in my stock gs if I could of. My 66 gs cam was pretty mild it seemed to me. I used to sit at a stand still and floor it and let it rev till it was wide open and dump the clutch. Tach was not working so I am guessing the high 4000 rpm range. It would burn rubber but it would kinda fall off and if I let off the gas a little and let it come down a little it would continue to spin the tires and feel like it had good power again, Seemed like it liked it at around 42 or 4400 rpm. Stock nailhead seems to have cfm stall at about .480 lift, It starts to get turbulent. It might get a few more cfm but not much. If I was getting head work done and you know a higher lift cam will take advantage of the cfm, I would get one. Makes sense to me but a lot of times what I think makes sense my wife tells me I am crazyuzzled: ---------- Post added at 11:05 AM ---------- Previous post was at 10:58 AM ---------- I agree that is funny, I am still laughing:laugh::laugh:
So...if one was to put the 091 on a shot of steroids,do like gsgtx says mabey you have a even better street cam. We know the wider lsa of 112 or 114 holds on a little up top but it seems you cant argue with the way the 091 rano No:
I would think that was possible.....:Brow: but I have found the 091 to be good as it is,,,,you might be able to improve it.... back when it was made , all you did was just bolt it in and go.... no blueprinting, no degreeing,,, no nuthin....:Brow: I am sure that there is some ''refinement'' there to be had.....:Smarty:and ,,,, if you think about it,, that is all we do,,, take a engine further into refinement than the factory was willing to do.....:Brow::Brow: Wy ,,,I have even ''refined'' some things so much , they would not work at all anymore....:laugh:
I keep forgetting that I DO have a '091' cam here! Buick used that cam in the '66 Skylark GS L76 option..... That's the 340 hp 401 with Q-jet, '091' cam, and 2x4 distributor. That combo was 'advertised' as making 15 extra hp at a higher rpm of 4600.
Walt, do you think the combo was underestimated? Now that would of been great to roll off the floor and go look for a street fight. That set up has just what the nailhead needed. Also have you ever drove this car? Starting to wonder how the 091 would act on steroids. Faster ramp, more lift, and a little more duration, mabey even a solid so you dont get any lifter failure from fast ramp..... Hmmm, mabey? But then you also have a roller that has been mentioned. Oh so many choices and so few engines at my house
The roller cam would be the way to go,once you go roller,you'll never look back. With a roller cam,you wouldn't have to worry about adding ZDDP to todays crappy oil anymore,and there is no break-in to worry about either. With a similar ground roller cam you can expect around 50 more HP than a flat tappit cam. With a more modern profile even more useable power is possible throughout the rpm range.:Brow:
