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biggest 340 cam and still have power brakes? #985285 05/03/11 12:50 AM 05/03/11 12:50 AM
Joined: Jan 2007 Posts: 389 kansas city, mo rave_12000 OP enthusiast
rave_12000 OP enthusiast Joined: Jan 2007 Posts: 389 kansas city, mo	wondering how big of cam I can put in a 340 in my 70 challenger and still have power brakes???? Comp cams.

Re: biggest 340 cam and still have power brakes? [Re: rave_12000] #985286 05/03/11 12:53 AM 05/03/11 12:53 AM
Joined: Jul 2008 Posts: 30,441 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,441 Florida STAYcation	I say RUN whatever you want ...NO WORRY ... just get a vacuum-storage-cannister

Re: biggest 340 cam and still have power brakes? [Re: dOc !] #985287 05/03/11 08:31 AM 05/03/11 08:31 AM
Joined: Jan 2003 Posts: 1,009 Richmond Twp. Mi. Mr340 super stock
Mr340 super stock Joined: Jan 2003 Posts: 1,009 Richmond Twp. Mi.

Re: biggest 340 cam and still have power brakes? [Re: rave_12000] #985288 05/03/11 08:53 AM 05/03/11 08:53 AM
Joined: Apr 2008 Posts: 212 Mid Michigan C Coronet-R/T-Rag enthusiast
Coronet-R/T-Rag enthusiast C Joined: Apr 2008 Posts: 212 Mid Michigan	I've run the canister with my 340 and you get about 2 pumps at idle then no more vacuum. I would stay under 240 degrees of duration at 50. Actually, I would put on manual brakes and not worry about it.

Re: biggest 340 cam and still have power brakes? [Re: Coronet-R/T-Rag] #985289 05/03/11 09:15 AM 05/03/11 09:15 AM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	I'd guess 220 deg @.050 would work and 230 a big maybe depending on compression, lobe seperation and other details. PB seem to work OK with 12-13" or more vacuum. Tuneup also has a big impact on vacuum. Bigger cams like plenty of idle advance and careful mixture adjustment.

Re: biggest 340 cam and still have power brakes? [Re: ahy] #985290 05/03/11 11:13 AM 05/03/11 11:13 AM
Joined: Jan 2003 Posts: 1,481 Outside thedriver pro stock
thedriver pro stock Joined: Jan 2003 Posts: 1,481 Outside	i use a XE285HL comp hydraulic on my 340. my car operates generally in 4000ft-6500ft DA. Power brakes still work, but tuneup is definitely part of it. 1973 challenger Dana. 4 speed. Low deck.

Re: biggest 340 cam and still have power brakes? [Re: thedriver] #985291 05/03/11 11:26 AM 05/03/11 11:26 AM
Joined: Jan 2007 Posts: 389 kansas city, mo rave_12000 OP enthusiast
rave_12000 OP enthusiast Joined: Jan 2007 Posts: 389 kansas city, mo	had 268/280 224/230 .477/.480....thinkin about bumpin up to 274/286 230/236 .480/.491. comp cams. any advantage here? 340 six pak approx 9.5 to 1 compression.

Re: biggest 340 cam and still have power brakes? [Re: rave_12000] #985292 05/03/11 11:31 AM 05/03/11 11:31 AM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
70Cuda383 Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	no matter how big the cam, when you lift on the throttle and the engine is still spinning 1500-2000 rpm, it will "charge" the vacuum booster, and you'll get one or 2 pumps of the brakes. stop and go traffic is different obviously... but, you could get a vacuum canister to store up extra vacuum, get an electric vacuum pump dedicated to the brake booster and hidden under the fender out of sight, or go with manual brakes. Photobucket sucks

Re: biggest 340 cam and still have power brakes? [Re: rave_12000] #985293 05/03/11 01:19 PM 05/03/11 01:19 PM
Joined: Jan 2003 Posts: 1,481 Outside thedriver pro stock
thedriver pro stock Joined: Jan 2003 Posts: 1,481 Outside	Quote: had 268/280 224/230 .477/.480....thinkin about bumpin up to 274/286 230/236 .480/.491. comp cams. any advantage here? 340 six pak approx 9.5 to 1 compression. you would notice a slight hp increase with that cam. However, i doubt it would be worth the money (and labour)for the increase in power over the 268. like maybe 15hp?? i would recommend spending the money on something else. I used to run the comp 268 cam in my 340, i had iron heads, 10:1cr headers etc. I decided on the cam change (285HL, like i previously mentioned) but also went with edelbrock heads. power increase was substantial. but looking back, it was probably mostly due to the heads. 1973 challenger Dana. 4 speed. Low deck.

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