Hot Rod Forum banner

Choppy/Loppy Flat Tappet Cam for Stock 305 H.O. L69

3394 Views 121 Replies 12 Participants Last post by  BogiesAnnex1
After removing my lifters and inspecting them, I have learned that I need to replace my camshaft and my lifters...

If I'm going to replace the camshaft then I want to do it possibly with something a little better than stock...

I wanted to sound choppy/lopey...

What is a good camshaft and lift a kit that will make my engine sound a little more choppy ?
  • Like
Reactions: waynehyde01
21 - 40 of 122 Posts

· Registered
Joined
·
21 Posts
After removing my lifters and inspecting them, I have learned that I need to replace my camshaft and my lifters...

If I'm going to replace the camshaft then I want to do it possibly with something a little better than stock...

I wanted to sound choppy/lopey...

What is a good camshaft and lift a kit that will make my engine sound a little more choppy ?
Of the 305 engines, yours is reasonably well tuned for its I tended use and is biased toward more torque than horsepower. If I was choosing a cam, I would stay pretty close to factory specs or just a very small bump up. You might do well, by using a fresh stock cam and invest in an exhaust upgrade, to enhance the sound you desire. A freer flowing exhaust could help more than the cam without destroying drivability.
 

· Registered
Joined
·
461 Posts
Discussion Starter · #23 ·
Of the 305 engines, yours is reasonably well tuned for its I tended use and is biased toward more torque than horsepower. If I was choosing a cam, I would stay pretty close to factory specs or just a very small bump up. You might do well, by using a fresh stock cam and invest in an exhaust upgrade, to enhance the sound you desire. A freer flowing exhaust could help more than the cam without destroying drivability.
What are some stock, affordable, and reliable brands of flat tappet camshaft and lifter kits ?

I plan on redoing my whole top end: camshaft, lifters, push rods, rocker arms, rocker balls and nuts, and maybe the valve springs if needed... If I get valve springs what size do I need to look for ?

I hear Melling and Elgin are good good brands, what about Comp, Edelbrock, Voodoo, and the others I should know about ?
Font Parallel Event Symbol Logo
 

· Registered
Joined
·
461 Posts
Discussion Starter · #24 ·
Of the 305 engines, yours is reasonably well tuned for its I tended use and is biased toward more torque than horsepower. If I was choosing a cam, I would stay pretty close to factory specs or just a very small bump up. You might do well, by using a fresh stock cam and invest in an exhaust upgrade, to enhance the sound you desire. A freer flowing exhaust could help more than the cam without destroying drivability.
What are some affordable and reliable brands of flat tappet camshaft and lifter kits ?

I hear Melling and Elgin are good good brands, what about Comp, Edelbrock, Voodoo, and the others I should know about ?
I've used those cams in 350, 327, & 305 engines without any issues. These were definitely not 11.0:1 compression engines. I'd be shocked if they were 9.0:1.
The factory L69 305 had a compression ratio of 9.5:1, flat top pistons...I use 91 octane non ethanol, 87 runs like crap.
 

· ******* Professional
Joined
·
1,727 Posts
Try a Melling CCS-37 it's supposed to be for the 305 HO engine (higher performance than the CCS-23) How about that photo of the RPO codes in your glovebox??????? See if yours is really a L69 and a SS.

If you want to replace valvesprings - stock for your engine is fine with these mild cams. Extra stiff and you just risk more camshaft wear.
 

· Registered
Joined
·
461 Posts
Discussion Starter · #27 ·
L69: 202/206, .403/.415, 114.5
Font Screenshot Number Terrestrial plant Document

Font Terrestrial plant Number Screenshot Document
 

· Registered
Joined
·
461 Posts
Discussion Starter · #31 ·
How about that photo of the RPO codes in your glovebox??????? See if yours is really a L69 and a SS.
I looked up the VIN number and it's not an SS...

What I'm assuming to be an l69 doesn't have the same bolt pattern as the Chevy TH350C transmission I have.

See how different the motor mounts to the transmission ?
Automotive tire Tire Tread Hood Road surface

Wheel Tire Automotive tire Motor vehicle Automotive lighting


I think this is a Buick motor with l69 heads on it... The head casting numbers show l69 but the block itself shows 1983 to 1984 305 motor.
 

· Registered
Joined
·
16,340 Posts
GM stays pretty much in this zone of 190 to 205 degrees intake measured at .050 lift. They flutter around lifts with a 1.5 rocker in a range of about .390 to about .450 lift. The LSA’s most anchor at 111-112 degrees but there are excursions from 109 up to 117 degrees. This is just dinking around with a mild cam trying to find a spot that keeps the emissions and mileage quotas happy.

In a high 10.5 compression 327 with a 4bbl these type cams will deliver about 290-300 horsepower. In a 9.5 compression 350 set up the same the power is about 290-300 horsepower. All of this at pretty modest RPM. A 305 set up the same as the 327 or 350 you could expect proportionally less power based on the missing cubic inches.

Most of these cams as I said are just the result of engineers dinking around on a dyno playing with combinations that meet emission and mileage requirements in the real world small changes in this zone don’t amount to differences you’d see on a time slip and probably don’t matter much to your butt dyno either.

Not that a 305 can’t be built meaner than it is but lumpy cams want more RPM, more RPM wants more part strength and stiffer gearing. That’s the physics the only band aid around this is a power adder of some sort.

Now I don’t know about your town but when I was young in my town it wouldn’t be long before you get chose off, prove it or park it. Once it was established you were all noise and no go you got laughed off the parking lot.

Bogie
 

· ******* Professional
Joined
·
1,727 Posts
I looked up the VIN number and it's not an SS...

What I'm assuming to be an l69 doesn't have the same bolt pattern as the Chevy TH350C transmission I have.

See how different the motor mounts to the transmission ?
View attachment 627806
View attachment 627805

I think this is a Buick motor with l69 heads on it... The head casting numbers show l69 but the block itself shows 1983 to 1984 305 motor.
Its a Chevy motor. Buick motor is completely different and Chevy heads dont fit.

If it came with a L69 it will say so on the RPO list. If it came with something else, it will tell you what. It will also tell you what rear end you have.

Unless you have specific wear, I would just clean up the rockers and pushrods and re-use.

You know how to change valvesprings and valve stem seals with the heads on the engine? It involves an air compressor.

Sent from my moto g power using Tapatalk
 

· Registered
Joined
·
461 Posts
Discussion Starter · #37 ·
Of the 305 engines, yours is reasonably well tuned for its I tended use and is biased toward more torque than horsepower. If I was choosing a cam, I would stay pretty close to factory specs or just a very small bump up. You might do well, by using a fresh stock cam and invest in an exhaust upgrade, to enhance the sound you desire. A freer flowing exhaust could help more than the cam without destroying drivability.
What are some affordable and reliable brands of flat tappet camshaft and lifter kits ?

I hear Melling and Elgin are good good brands, what about Comp, Edelbrock, Voodoo, and the others I should know about ?
 

· Registered
Joined
·
461 Posts
Discussion Starter · #38 ·
If it came with a L69 it will say so on the RPO list. If it came with something else, it will tell you what. It will also tell you what rear end you have.
My glove box doesn't have an RPO list...
Motor vehicle Hood Automotive lighting Automotive design Bumper


However I do have the title with the VIN number on it and I also have the original owners manual that came with the car...
Sleeve Handwriting Font Metal Pattern

Font Rectangle Paper Paper product Document

White Font Material property Publication Book


It's too late to go out there and take a picture of my VIN number right now and the picture I have is blurry which is why I'm showing you my title... But my engine code is 9 and the car originally came with a 3.8 229 CID V6 motor...

Here is the current block number for the motor that is currently in the engine.. when I googled these numbers, it says it's in 83 to 84 305... I don't have a picture handy, but I also took a picture of the head casting numbers under the valve covers and those numbers brought up high output heads.
Automotive tire Hood Automotive lighting Motor vehicle Bumper
 

· ******* Professional
Joined
·
1,727 Posts
I'm not for sure about specific wear, I just visually assumed those things were okay.. I did clean the push rods and I cleaned parts of the rockers and the rocker balls and set everything back just as I pulled them out.
Then they should be just fine for this. I would guess the heads are original to the motor so if they are H.O........

Sent from my moto g power using Tapatalk
 
21 - 40 of 122 Posts
Top