johnfharding

Guys,,, here are the cams I'm looking at,,, Comp Cams 264 HR 08-412-8
or 270HR 08-422-8,, or the ZZ4 or Hot Cam,,, I can pick up the ZZ4 for 140 bucks on Ebay. Main thing I want is to keep the idle sound I have currently,, with my 327.. It has a L-79 cam. Which one would make the car sound like the old days?,,, specs on my build,,, I'm running a 2 bolt 030 over late model 350 block, stock crank and rods with Hypertectic pistons and moly rings,, Edelbrock Performer RPm manifold,, Holley 600 carb, 92 corvette tubular exhaust headers. and stock 67 exhaust 2 1/2 inches and I'm planning on running the 180 AFR heads and 1.5 or 1.6 roller rockers

gkull

I had to lookup your L-79 motor to find out what it really was. 327ci 350 hp. For a motor to sound the same it just has to have equivolent valve timing and = compression.

Stock chevy cams always had wide lobe centers to keep valve over lap to a minimum. Comp cams intentionally uses narrow 110 lobe centers to even give their relatively mild duration cams a race car lumpy idle

I would look a other cam companies HR cams and find something in the 112-114 lobe center range. The ZZ4 might be close.

IMO - I would not spend the money on mild roller cam. Your not going to be making much power with 264 or 270 cams so why not just buy a H-flat cam like the crane 272

korvetkeith

I suspect the 110 lobe center because thats what generally makes the best power. I've been reading a few LSA comparos lately, and the cam LSA from the manufacturer is usually ideal. I do agree with gkull about going aggressive. I've got a 218 224 on 112 comp XR 269, I wish I would have went with a 230/236 on 112. But I haven't even fired the motor yet so it's early to be wishing for different parts.

johnfharding

The motor I'm building came with a roller cam ,,, lifters and so forth and I figured I might as well take advantage of the situation since I already have everything I need.. The cam that was in the engine is a Vortec Truck 5.7L cam .. its Nothing special and from riding with my brother in his truck,,, they run out of air at around 5,000 rpm. I would say mostly because of the small cam. I thought about the GM Hot Cam its a little more agressive than the others ,, but I wasn't for sure if it was too agressive.

The duration at lash point in degrees (intake/exhaust) is 279/287;

Duration at .050" tappet lift (intake/exhaust) is 218/228;

Maximum lift with 1.6 rocker ratio (intake/exhaust) is 525/525.

Valve lash is zero/zero and lobe centerline is 112 degrees.

gkull

roller cams run milder than the equivolent H-Flat lifter. IMO - 350 ci is really pretty mild with cams under 224 degrees of intake @ .050 on any kind of cam and still streetable with roller cams up to 232 degrees on the intake side with enough compression.

patrick291

i have headers with straightpipe to mufflers, stock carb, cold air intake. port polished. i need a cam for horsepower but i wanna drive this everyday so i dont need extreme but id like around 80HP from the cam. what kinda carb should i get?? 650?-700? i dont know and need advise. can u help. 81 350sb auto numbers matching

adown

Look at the TRW line. They offer stock,performance and race grinds, and are a lot less expensive than anything else.