355 Build

[srich1207]

hey guys I am needing some advice on what cam and what heads to put in my truck. I have a 72 C10 with a Turbo350 with 3.55 gears. this truck is my toy that I will drive maybe once during the week and sometimes on weekend. I won't be doing any towing, I am wanting a cam that produces good low to mid-range torque, this truck will rarely if ever see 5000 RPM's and this is what I am thinking about and yall tell me if I am on the right track.

355 Small Block
Stock Bottom End
Flat Top Pistons (with 4 Valve Reliefs)
Comp Cam HE268H
Advertised Duration: 468/468 @.050 218/218
Lift: 454/454
Edelbrock RPM Aluminum 2.02 64CC Heads
Edelbrock Performer EPS Intake
This was on the truck if I can use the RPM Air Gap and make more torque
let me know
Edelbrock 600 CFM Carberator

I am calculating that my compression should be somewhere around 9.3-1 I know there are more factors that go into figuring that than what I have but I think that will be pretty close. What I am after is a good sounding cam, but I still want to have good vacuum at idle so I can run power brakes, AC, Power steering, etc. And also does anyone have an idea of what kind of power HP/Torque this will produce and if it will have good vacuum.

[Fldawg]

That is a really good cam for what you want. you might want to advance the cam 2 or 4 degrees for more bottom end depending on how much you want.
you might want to look at the 350 horsepower 327 cam that a really good cam , you get good power plus a little lope lope

[dznucks]

I am building a very similar engine at the moment. 355, flat tops, vortec heads modified for more lift. I was going to go with that exact same cam.

The reason i didnt go with it was due to some complaints about valve noise due to the way the lobes opened/closed so fast. I Youtubed videos of the different cams in 350 or 355's to get an idea of what cam had the sound i liked.

I went with the Lunati 60103. I am building the bottom end right now.

I dont see anything wrong with what your planning on doing. You compression seems about right for that cam too. The air gap manifold might not benefit your application.

[srich1207]

Originally Posted by dznucks

I am building a very similar engine at the moment. 355, flat tops, vortec heads modified for more lift. I was going to go with that exact same cam.

The reason i didnt go with it was due to some complaints about valve noise due to the way the lobes opened/closed so fast. I Youtubed videos of the different cams in 350 or 355's to get an idea of what cam had the sound i liked.

I went with the Lunati 60103. I am building the bottom end right now.

I dont see anything wrong with what your planning on doing. You compression seems about right for that cam too. The air gap manifold might not benefit your application.

Hey dznucks I have actually read the same thing about the HE268 Comp Cam about their ramping on the cam. Will the Lunati give me fair to good vacuum for my accessories like I want?

[406 Q-ship]

With flat tops and 64 cc chambers will get you 10.25 compression. 76cc chambers will get you just around 9.0. That should be a great cam for that engine, I am looking at the same cam for my 74 C10 truck. If I were you, i would step up to the RPM intatke too, the performer is just a stock 4 bbl intake that does give alot of boost in power, the RPM will run much better.

[oldblue1968chevy]

Whats the differeence between 268H and 268XE?

Which ones better

[dznucks]

Will the Lunati give me fair to good vacuum for my accessories like I want?

I dont know. I havent got the motor build yet, still working on bottom end. Its my understanding that it should still maintain a decent vacuum to run accesories. I am not running any, so it wasnt a factor for me.

[stroked69]

I had a similiar grind cam from Isky with 10.1 flat tops and modified double hump heads in front of a TH350 and 3.54 rear. The motor really came to life after 5000 rpm and made about 350hp. I had no problem with vac.