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#809115 - Wed Dec 21 2011 04:07 PM hotter cam in 235
joethehuman Offline
New Guy
Registered: Mon Sep 17 2007 12:00 PM
Posts: 48
Loc: 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
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#809152 - Wed Dec 21 2011 06:19 PM Re: hotter cam in 235 [Re: joethehuman]
Wrenchbender Ret. Offline
Master Gabster
Registered: Sun Jun 20 2004 12:00 PM
Posts: 9158
Loc: 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.
_________________________
If it ain't broke, sell it & buy one that is.


1956 Chevy 1/2-Ton Pickup

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#809236 - Wed Dec 21 2011 09:53 PM Re: hotter cam in 235 [Re: Wrenchbender Ret.]
tclederman Online
Registered: Tue Sep 18 2001 12:00 PM
Posts: 20504
Loc: Castleton-on-Hudson, NY

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).

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#809287 - Thu Dec 22 2011 12:10 AM Re: hotter cam in 235 [Re: joethehuman]
RingLeader Offline
Wrench Fetcher
Registered: Wed Jun 22 2011 01:43 AM
Posts: 141
Loc: 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
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#809343 - Thu Dec 22 2011 08:57 AM Re: hotter cam in 235 [Re: RingLeader]
panic Offline
Shop Shark
Registered: Tue Dec 23 2008 09:20 AM
Posts: 787
Loc: Long Island
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#809363 - Thu Dec 22 2011 10:14 AM Re: hotter cam in 235 [Re: panic]
Hotrod Lincoln Offline
Extreme Gabster
Registered: Mon Feb 23 2004 12:00 PM
Posts: 11209
Loc: 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
_________________________
My best friends are Sam, Eli, Bill, and Gene:
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#809399 - Thu Dec 22 2011 12:39 PM Re: hotter cam in 235 [Re: Hotrod Lincoln]
waldo53 Offline
Shop Shark
Registered: Sat Dec 09 2006 12:00 PM
Posts: 1707
Loc: 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.
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#809447 - Thu Dec 22 2011 04:01 PM Re: hotter cam in 235 [Re: waldo53]
53moneypit Offline
Registered: Sat Dec 20 2003 12:00 PM
Posts: 2901
Loc: 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
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Engine & Driveline Moderator

If you can't make seventy by an easy road, don't go. ~~ Mark Twain
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#809448 - Thu Dec 22 2011 04:05 PM Re: hotter cam in 235 [Re: 53moneypit]
tclederman Online
Registered: Tue Sep 18 2001 12:00 PM
Posts: 20504
Loc: Castleton-on-Hudson, NY
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?
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#809511 - Thu Dec 22 2011 07:53 PM Re: hotter cam in 235 [Re: tclederman]
joethehuman Offline
New Guy
Registered: Mon Sep 17 2007 12:00 PM
Posts: 48
Loc: 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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