POston advertises the 113A as the biggest cam with A/C and power brakes. I think you need a minumum of 10" of vacuum to run the booster.
If you simply want to run the biggest possible cam, why not run a vacuum pump, or convert to a hydra-boost system? Then you can run whatever cam you want. I would stay away from the powermaster system though, it's pretty unreliable and parts are expensive.
Poston GS 113A Intake duration @ .050" lift: 232 Exhaust duration @ .050" lift: 246 lobe center: 113 lobe lift- intake: 0.319 lobe lift- exhaust: 0.307 valve lift- 1.59 ratio rocker- intake: 0.510 exhaust: 0.491 It's similar to a TA413 with more of a duration split. Good for iron heads.
Depending on how much you advance it, you can use a bigger cam. Jim Weise used to post about the 290-08H, which is pretty big (238/248-112). He said you had to advance it 4 degrees (if I remember right) and a couple of other things you have to have just right. I think he quit posting about it because people weren't willing to take all the precautions that will make it work, and some people were complaining.
Something like that.. Actually, I quit talking about cams altogether, and started talking about cylinder heads.. to put more emphasis on those parts, since they are what makes the power. Way Way too much talk about camshafts here.. And some folks do get excited about cams, that's for sure.. Truth is, you can prolly put 3 or 4 different, very similar grinds in a given engine, and come up with very similar performance. as to the question, keep your overlap at 20* or less, and it will run the brakes.. with overlaps in the 15-20* range, I typically will advance the cam a couple extra degrees, and run at least 20* of intial timing in the distributor. I still consider the TA 290-08H or HL the max cam for a street car, and have built a number of cars now with that cam. I have never had a problem with it, and can only recall one person who seemed to be having an idle quality issue with it. It's a real nice, powerful ported iron head camshaft, and I have two motors going together with one right now. But it is the max cam, that's for sure, and anything beyond those specs I don't consider a street cam, although plenty of other folks do, and plenty of guys run some wild stuff on the street. But with 4 speeds, or vacuum pumps ect.. Run at least 3.42 gears and a 3000 stall converter with any cam over 15* of overlap. The 290-08H has 19*, and is my standard Level 2 cam, the 290 H, which is a 238* straight pattern cam, is my Level 2A (alum head) cam, and we went away from the split duration with the alum head, and tightened up the lobe center which brought the overlap back up to 19*, and broadened the power band. welp.. I gotta get back to work here... Hope that helps. JW
Can this single pattern cam be ordered from TA. If so what is the part#? When I called Comp. cams they recommended there 292 Magnum chivy lobes on a buick core. I would rather have a cam I know that will work with alum. heads, rather than take a crapshot at it. Thankx.
Yes.. call TA (1-480-922-6808) and talk to Mike or Dave, tell him you want the 238/238 on a 110 LC.. I believe it is the TA 290H. Just make sure your Alum heads have been worked in the chambers and bowls, to get the exhaust flow up.. if not, then order the 290-08H. JW
Thank's Jim. I have the SE Stg 2's., with mildly reworked bowls. I plan to see lots of road time with this motor. I believe the 290 H will work perfectly. Thanks again!
I see the vacuum pumps in the TA catalog but they aren't shown on the website. Is anyone running one on here and how much are they? What about a vacuum storage canister?
In the late 80's and early 90's, I run the old KB "107 window rattler " with power brakes in my 70 GSX with a reserve tank. It ran 11.70's @ 114 mph and had no problem stopping. I don't recall the specs ,but it kept the fenders dancing. Bill
That's insane! How did you pull it off? KB107 240 deg intake @.050" 262 deg exh. @ .050" lift- .474" with 1.6 ratio
My Dad has an old vacuum canister from Crane Cams. How will this work in terms of performance? It is new in the box
I am building a 455 TA aluminum stage 1 heads Pont SD rods 10 to 1 ross pistons with a Lunati Hemi Killer cam with 373 rear th 400w/ 3000 stall . TA hedders, 900CFM holley by BG and Offy intake All in a streetable GS 455 ? IS this a good combination or am I looking for trouble ? I already have the SD rods set up for BBB and TA suggested oil mods to timing cover and block
If you have a true SCR of 10:1 , with the HK at 106 ICL (assuming 110 LSA and 4 deg adv) your DCR will be 7.5. It will run on 93 octane, but you will leave a little power on the table. IMO, I would run up the SCR up to around 11:1, which will give you a DCR of 8.3, which is still good for 93 oct and AL heads.
stage70 what offy intake are you running? You don't hear much about them any more. I will be running the SP1. I will be building an engine very similar to yours but with 12.5 JE pistons and a cam very similar to the 290-08H. It is a Reed cam with .523" and 236* intake and .536" and 244* with 1.6 rockers. The lobe centers is 114. The main difference between the two is the 290-08H has .016" less lift on the exhaust.
