355 cam question
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355 cam question - 8/13/2007 6:57:40 PM
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94blazer00
Posts: 12
Joined: 8/3/2007
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I just bought a early 70`s 350 bored .30. The guy said it has an rv cam but i can`t remember the brand.I want to know if an rv cam is good or bad. If its not good what is a good affordable cam?
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RE: 355 cam question - 8/13/2007 8:15:49 PM
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swartlkk
Posts: 14499
Joined: 5/1/2005
From: Waterloo, NY
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An RV cam will have more low end grunt and probably not that great of a top end. As far as budget cams... Well, what do you want this engine to do?
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RE: 355 cam question - 8/14/2007 4:57:12 AM
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DetroitMuscle
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There are alot of "affordable" cams out there, it just depends on what you want to do with the motor.
I pulled this from the vast net.
The RV camshaft was originated by Erson Cams in 1972. Originally designed for use in heavy vehicle and towing applications, these camshafts have proven to be the perfect answer for late model, low compression engines, and are now used primarily in passenger cars, station wagons and light utility vehicles. RV Cams are suitable for use in otherwise stock low compression engines. Usable power is increased between 1500 and 5000 (depending on application). These camshafts have a smooth idle, excellent throttle response and acceleration, plus good fuel efficiency. For the best possible performance, the engine should be equipped with headers, a free-flow exhaust system, a small 4-barrel carburetor and a re-curved ignition system. These camshafts are ideal for sedans, station wagons, pick-ups, vans and motor homes. Suitable for over-the-road driving, trailer towing, etc. Idle is smooth and standard gearing is satisfactory. RV Cams are available for all late model American passenger car and light truck engines in hydraulic or mechanical designs.
If you are looking for a good street cam is get something along the lines of a 268 grind.
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RE: 355 cam question - 8/14/2007 4:37:09 PM
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94blazer00
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Thanks for the information it was helpful. Looks like i`ll be getting rid of the rv cam soon.I want to hit the 300 hp mark with this motor.Right now it`s bored .30 , edelbrock intake,670 holley carb,headers,k&n open air cleaner and the rv cam.Also want the cam to have a slight lope to it but not alot.
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RE: 355 cam question - 8/14/2007 4:43:42 PM
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swartlkk
Posts: 14499
Joined: 5/1/2005
From: Waterloo, NY
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Depending on when in the 70's the motor was made, you should already be over 300hp with what you have done or plan on doing... The motor in my Chevelle is a 10.25:1 compression motor with a Edlebrock Torquer Intake and Holley 650 DP carb, 2.02/1.60 iron heads, a fairly large cam that came with the motor, and 1-5/8 primary headers and it was good for 386HP/425FTLB on the machine shops engine dyno 12 years ago!! If you have a later 70's 350, the compression ratio may be as low as 8.5:1. If that is the case, then you may want to look at putting on a set of heads and new pistons to bring the compression ratio back up to somewhere in the 9.5:1.
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RE: 355 cam question - 8/14/2007 6:37:19 PM
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94blazer00
Posts: 12
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The guy i bought it from said it ran high 12`s when he had a better comp cam in it. I will know for sure what motor i have as soon as i pull it out of the car and get the numbers.The car that the motor is in a 78 pontiac lemans that had a 6cyl and he put the posi rear w/342 gears. I think my 94 blazer has the 308 gears but not sure.If so will the 342 gears work in mine?The guy i bought the car from said they would but im not sure.
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RE: 355 cam question - 8/14/2007 6:51:09 PM
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swartlkk
Posts: 14499
Joined: 5/1/2005
From: Waterloo, NY
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All depends on what rear end you have under your truck and what that lemans has... If both are 8.5" 10-bolt rears, then yes, but mostlikely, you have the 7-5/8" ring gear...
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Kyle-
04 Rainier
My Restoration Projects
Please Do Not PM for Tech Help
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