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#809115 - Wed Dec 21 2011 10:07 PM hotter cam in 235  
joethehuman  Offline
Wrench Fetcher
Joined: Sep 2007
Posts: 55
seattle Washington
This is where I'm at with my 235 in an AD truck. Rebuilt short block, 848 head with solids.Holley 2 barrel carb fron Langdon's stovebolt, Fenton headers, and Mallory electric distributor. I'm wondering how much I would gain with a 3/4 cam from Patrick's Antique auto parts. It runs well now, just want to get all I can and a cam isn"t a lot of money $250 with new lifters from Patrick's. Opinions? Warnings?Better ideas?


[url=http://www.stovebolt.com/gallery/shannon_joe_1953.html]1953 Chevy 3100[/ur When life looks like easy street there is danger at your door


#809152 - Thu Dec 22 2011 12:19 AM Re: hotter cam in 235 [Re: joethehuman]  
Wrenchbender Ret.  Offline
Master Gabster
Joined: Jun 2004
Posts: 9,678
Lenexa Ks.
A cam is a good idea if it is not over done which quite often is the case. The popular one for this engine is the 261 cam. In fact that was what GM did when they came out with the 6 cyl. Corvette. I would check with Patricks & see if there cam is similar to this.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup


#809236 - Thu Dec 22 2011 03:53 AM Re: hotter cam in 235 [Re: Wrenchbender Ret.]  
tclederman  Offline
Joined: Sep 2001
Posts: 24,922
Jarvisburg, NC

The 235 in Corvettes was available from 1953 into 1955. The 261-style cam was used in 235 Corvettes from mid-1954 until they ran out of 235s for Corvettes (sometime in 1955).

I'll be putting one of those Corvette cams into my 1954 truck 235 when I rebuild it (and, it will get an "848" head).



Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 45 years
1954 3104 5-window pickup w/Hydra-Matic
Z-series (54/55) GMC 350 (2-ton) COE
If you have to stomp on your starter, either you, or your starter, or your engine, has a problem.

#809287 - Thu Dec 22 2011 06:10 AM Re: hotter cam in 235 [Re: joethehuman]  
RingLeader  Offline
Shop Shark
Joined: Jun 2011
Posts: 148
California
I just built a 235 with an 848 head, langdons hei, and Patrick's "hotter" cam. The plan was to end up with the two barrel conversion setup with headers in the future. Right now I'm saving up for the intake and exhaust so I'm running the stock stuff, rochester B, etc. It runs okay now but the carb is really holding the setup back. When I called langdons to order the hei he suggested that the dual two barrel setup would "really make the combo sing". I have no idea of how that translates to horsepower numbers, others can comment, but I hope to feel it in the seat of my pants.

Keep in mind if you like a smooth running 235 the hotter cam from Patricks isn't for you, it's a bit on the lumpy side. I know I haven't answered your question but I guess the point is that I'm on the same track and I feel it's the right one for where I want the look under the hood, the sound out the back, and the feel on the road to be.


Sort of stock 1950 Chevrolet 3100
235 (The engine shread) (Engine assembly)- 4 speed - 12 bolt - stock front axle with power disc brakes

#809343 - Thu Dec 22 2011 02:57 PM Re: hotter cam in 235 [Re: RingLeader]  
panic  Offline
Shop Shark
Joined: Dec 2008
Posts: 1,057
Long Island
The Corvette and 261 truck cam has less duration than the stock 235 Powerglide cam. Quoting Frank McGurk: “This cam has proven to be unsatisfactory for modification work”.


#809363 - Thu Dec 22 2011 04:14 PM Re: hotter cam in 235 [Re: panic]  
Hotrod Lincoln  Online
Extreme Gabster
Joined: Feb 2004
Posts: 14,649
Dellrose, TN
Regardless of what buzzword is used (3/4-race, etc.) the bottom line is that a street-driven engine doesn't work well with a cam with more than about 270 degrees of lobe duration, intake or exhaust. Stovebolt engines don't play well with high lift because of the close clearance between the intake valve and the top of the piston. Flycutting the piston for valve relief reduces compression, and the combustion chamber shape limits the options for making a domed piston.

Because super long-duration cams MUST have increased compression to work right, the stovebolt's combination of oddball valve geometry and combustion chamber shape makes it difficult to benefit from a radical cam.
Jerry


Who says I live in a rough neighborhood- - - - -?
Just because I'm a tail gunner on a beer truck, maybe?

"He ain't even got a noddin' acquaintance with the truth- - -let alone a speakin' one!"


#809399 - Thu Dec 22 2011 06:39 PM Re: hotter cam in 235 [Re: Hotrod Lincoln]  
waldo53  Offline
Shop Shark
Joined: Dec 2006
Posts: 1,707
ID
According to Patrick's catalog, there are three "3/4" cams available. Here's the numbers for comparison: (I'll just post the I and E duration numbers and the lift, the catalog has more info as to when the valves begin to open or close)

Stock 261/Corvette cam: I = 244, E = 244, lift .414
Patrick's "3/4 mild": I = 245, E = 256, lift .425
Patrick's "3/4": I = 252, E = 264, lift .436
Patrick's "3/4 rumpy": I = 277, E = 270, lift .436

You might want to give Patrick a call and ask his input (I know, I know, he probably wants to sell you a cam) but I've found him to be a straight-up guy and he does have a ton of experience with 235's.


#809447 - Thu Dec 22 2011 10:01 PM Re: hotter cam in 235 [Re: waldo53]  
53moneypit  Offline
Joined: Dec 2003
Posts: 2,901
Smallville IN
I have the Patricks 3/4 std w/252I / 264E and it runs OK but is a little rough and not as smooth as I would like. Also have the Offy 2x2 intake w/ Holley Webers and I would not do that again.


1953 Chevy 5-window 3100
In the Stovebolt Gallery
More pix on Picturetrail

Dave
Engine & Driveline Moderator

If you can't make seventy by an easy road, don't go. ~~ Mark Twain

#809448 - Thu Dec 22 2011 10:05 PM Re: hotter cam in 235 [Re: 53moneypit]  
tclederman  Offline
Joined: Sep 2001
Posts: 24,922
Jarvisburg, NC
Originally Posted By 53moneypit
I have the Patricks 3/4 std w/252I / 264E and it runs OK but is a little rough and not as smooth as I would like. Also have the Offy 2x2 intake w/ Holley Webers and I would not do that again.


235 or 261?

What was the problem with the Holley-Webers?


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 45 years
1954 3104 5-window pickup w/Hydra-Matic
Z-series (54/55) GMC 350 (2-ton) COE
If you have to stomp on your starter, either you, or your starter, or your engine, has a problem.

#809511 - Fri Dec 23 2011 01:53 AM Re: hotter cam in 235 [Re: tclederman]  
joethehuman  Offline
Wrench Fetcher
Joined: Sep 2007
Posts: 55
seattle Washington
Wow, lot's of information. Right now, with the Holley weber 2 barrel from Langdon and a stock cam, it runs very smooth, I guess I need to talk to Patrick's, but it sounds like the jury is out on positive results with a longer duration cam on the 235. Maybe I should just be satisfied with the factory setup in this case?


[url=http://www.stovebolt.com/gallery/shannon_joe_1953.html]1953 Chevy 3100[/ur When life looks like easy street there is danger at your door

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