Cam?
Thread Starter
Melting Slicks
Joined: Apr 1999
Posts: 2,010
Likes: 3
From: Moon Twp. PA USA
Cam?
I am starting to assemble parts for my new 383. Am going to use the TF 23* heads, Edel Performer RPM intake, and headers from my original motor. Bottom end will be new Scat crank and rods. Pistons will be Speed Pro Hyper, giving me about a 10.5 C.R.
My cam choices are CC Magnum 270, 280, or 286.
I put about 1,000 miles a year on her and will not take it to a strip until they build one within 20 miles of my house.
Anyone have any suggestions, and/or experience with these grinds?
My cam choices are CC Magnum 270, 280, or 286.
I put about 1,000 miles a year on her and will not take it to a strip until they build one within 20 miles of my house.
Anyone have any suggestions, and/or experience with these grinds?
Safety Car
Joined: Jul 2002
Posts: 3,770
Likes: 3
From: St Louis MO
Drifting
Joined: Jul 2001
Posts: 1,418
Likes: 1
Glen ,
It is important to take rear gear and transmission into the mix .
I'd be looking at the Isky 270 Mega cam probably . Just depends on lack of info provided .
To give you an idea about the cam you posted , in most sub 400 inch engines the Comp 280 will not get you to the end of the 1/4 mile any quicker than the HE 268 with good heads if an automatic with 3.08 gears are used but I do think the HE 268 is too small for this engine of yours just by a hair
It is important to take rear gear and transmission into the mix .
I'd be looking at the Isky 270 Mega cam probably . Just depends on lack of info provided .
To give you an idea about the cam you posted , in most sub 400 inch engines the Comp 280 will not get you to the end of the 1/4 mile any quicker than the HE 268 with good heads if an automatic with 3.08 gears are used but I do think the HE 268 is too small for this engine of yours just by a hair
Thread Starter
Melting Slicks
Joined: Apr 1999
Posts: 2,010
Likes: 3
From: Moon Twp. PA USA
Originally Posted by mountainmotor
Glen ,
It is important to take rear gear and transmission into the mix .
I'd be looking at the Isky 270 Mega cam probably . Just depends on lack of info provided .
To give you an idea about the cam you posted , in most sub 400 inch engines the Comp 280 will not get you to the end of the 1/4 mile any quicker than the HE 268 with good heads if an automatic with 3.08 gears are used but I do think the HE 268 is too small for this engine of yours just by a hair
It is important to take rear gear and transmission into the mix .
I'd be looking at the Isky 270 Mega cam probably . Just depends on lack of info provided .
To give you an idea about the cam you posted , in most sub 400 inch engines the Comp 280 will not get you to the end of the 1/4 mile any quicker than the HE 268 with good heads if an automatic with 3.08 gears are used but I do think the HE 268 is too small for this engine of yours just by a hair
Just ran a bunch of DD numbers using various cams. I wanted to stay with a single profile cam, like the CC Magnum series, but comparing the numbers it looks like the XE268 is superior to the CC Magnum 270 in that it makes more power over 4000 rpm and the same power under 4000 rpm.
Racer
Joined: Sep 2000
Posts: 324
Likes: 0
From: Knoxville, Tennessee
Originally Posted by glen242
3.36 rear - ST10 wide ratio 4 speed
Just ran a bunch of DD numbers using various cams. I wanted to stay with a single profile cam, like the CC Magnum series, but comparing the numbers it looks like the XE268 is superior to the CC Magnum 270 in that it makes more power over 4000 rpm and the same power under 4000 rpm.
Just ran a bunch of DD numbers using various cams. I wanted to stay with a single profile cam, like the CC Magnum series, but comparing the numbers it looks like the XE268 is superior to the CC Magnum 270 in that it makes more power over 4000 rpm and the same power under 4000 rpm.
Looking at a cam catalog is very confusing if you don't take certain aspects into consideration. Comp cams catalog covers 265-400 ci engines and you can certainly believe that the same cam can be too big for one and not enough for the other. With your 383, the heads, and the CR I would rather err on the side of too big instead of too small. Plug the XE274 and the XE284 into your DD and see which one you are more comfortable with. BTW single profile cams are dinosaurs and stroker motors like bigger cams.
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
I ran a XE284 in a 383 with 10/1 comp, TFS heads and rams horn manifolds into 2.25" exh, it did not lack low end with a 4 speed and 3.70 gear. The XE274 might be better for your 3.36 rear end.
Forgot: I was running Crane fast bleed lifters which are supposed to decrease lift and duration at idle, I got a bad short block so the eng was not together very long, did not really beat on it but it def had some get up and go.
Forgot: I was running Crane fast bleed lifters which are supposed to decrease lift and duration at idle, I got a bad short block so the eng was not together very long, did not really beat on it but it def had some get up and go.
Last edited by Fevre; Oct 29, 2004 at 05:43 PM.
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Safety Car
Joined: Oct 2004
Posts: 3,923
Likes: 733
From: Youngstown Ohio
Originally Posted by glen242
I am starting to assemble parts for my new 383. Am going to use the TF 23* heads, Edel Performer RPM intake, and headers from my original motor. Bottom end will be new Scat crank and rods. Pistons will be Speed Pro Hyper, giving me about a 10.5 C.R.
My cam choices are CC Magnum 270, 280, or 286.
I put about 1,000 miles a year on her and will not take it to a strip until they build one within 20 miles of my house.
Anyone have any suggestions, and/or experience with these grinds?
My cam choices are CC Magnum 270, 280, or 286.
I put about 1,000 miles a year on her and will not take it to a strip until they build one within 20 miles of my house.
Anyone have any suggestions, and/or experience with these grinds?
Last edited by C3 Stroker; Oct 29, 2004 at 09:26 PM.
Race Director
Joined: Jan 2003
Posts: 15,175
Likes: 86
From: State of Confusion
glen242:
I run the 292H CC grind, in a 355" 10.3:1 CR SB w/ DART II (iron) heads, Victor Jr, etc., in my '79 Z28.
The rest of the drive-train is a 2.75:1 low-gear THM400, 8" converter, 4.10 gears, and slicks, and it runs 12-eighties at 105+.
On the street, w/ a 10" converter and 26" x 8" street tires, it ran 13.30s, and it wasn't that bad a ride as-far-as streetability.
I doubt anybody'll be building a strip near you anytime soon:
Pittsburgh Raceway Park has done a ton of improvements the last 3 years under new ownership, and is really doing well.....
Come out and play!!!
I run the 292H CC grind, in a 355" 10.3:1 CR SB w/ DART II (iron) heads, Victor Jr, etc., in my '79 Z28.
The rest of the drive-train is a 2.75:1 low-gear THM400, 8" converter, 4.10 gears, and slicks, and it runs 12-eighties at 105+.
On the street, w/ a 10" converter and 26" x 8" street tires, it ran 13.30s, and it wasn't that bad a ride as-far-as streetability.
I doubt anybody'll be building a strip near you anytime soon:
Pittsburgh Raceway Park has done a ton of improvements the last 3 years under new ownership, and is really doing well.....
Come out and play!!!
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Originally Posted by mountainmotor
I beg to differ
But I don't have the time for it so you win by default
But I don't have the time for it so you win by default
Drifting
Joined: Mar 2001
Posts: 1,395
Likes: 6
From: Indiana
Originally Posted by Fevre
Seems I have read that if the exh ports flow 80% (or greater) of the intake ports than a single pattern cam is better.
Dual pattern cams are used to compensate for poor exhaust port flow. I'm running a single pattern cam (282S) with the TFS heads on a 355. It's a very good match. With a 383, I would not go with anything smaller than the 280.
Racer
Joined: Sep 2000
Posts: 324
Likes: 0
From: Knoxville, Tennessee
Originally Posted by mountainmotor
I beg to differ
But I don't have the time for it so you win by default
But I don't have the time for it so you win by default
OOH, I knew this statement would start controversy. With all due respect, camshaft selection and head design have greatly improved naturally due to the advent of computer aided design and simulation. Most single pattern cam designs such as the comp cams magnum series have been in their catalog since the 70's. The vast, and I mean vast, majority of all newer cam designs by GM, Crane, Comp Cams and the like are split pattern simply because they work better.
Back to the original post: If there is any way to fit it in your budget, a hydraulic roller set up it truly the way to go. The ramp angles of the lobes will allow the valves to come off their seats much faster which creates significantly greater power gains with the same sort of lift and duration numbers. Flat tappet cams, albeit inexpensive, are also becoming a thing of the past.
Race Director
Joined: Nov 2002
Posts: 12,142
Likes: 54
From: Taylor Michigan
Why do people build engines for performance with a bunch of trick high dollar aftermarket parts and then limit the potential HP by 1000+ RPM`s by using a hyrdaulic cam that flattens out close to 5500+. Seems backwards to me. If you can`t spin the engine you may as well keep all those fancy parts in there boxs 
It may be good for bolstering in cruise parking lots but it sure wont win any races.
It may be good for bolstering in cruise parking lots but it sure wont win any races.
Pro
Joined: Sep 2002
Posts: 690
Likes: 1
From: near Memphis TN
Originally Posted by Ironcross
Why do people build engines for performance with a bunch of trick high dollar aftermarket parts and then limit the potential HP by 1000+ RPM`s by using a hyrdaulic cam that flattens out close to 5500+. Seems backwards to me. If you can`t spin the engine you may as well keep all those fancy parts in there boxs It may be good for bolstering in cruise parking lots but it sure wont win any races.
It may be good for bolstering in cruise parking lots but it sure wont win any races.Dual pattern cam's are not "the wonder cam". But they do work well on stock heads that are limited by restrictions in the exhaust valves, port, manifold, etc. They have little benifit if you have a highly modified head. There are exceptions - Pro-stock cars use dual pattern cams but they carefully match them to the heads.
Actually, TPI chevy engines don't work well with dual pattern cams.
Instructor
Joined: Oct 2000
Posts: 137
Likes: 0
From: Flemington, nj 08822 usa
Have a Pro built 383 for sale
Glen: My son had this engine built and wound up having to sell his '75.
I recognize you asked a cam question but perhaps you'd be interested in comparing your parts selection.
--------------------------------------------------------------------------------
http://www.csc.villanova.edu/~wthau/383.html
Larry
I recognize you asked a cam question but perhaps you'd be interested in comparing your parts selection.
--------------------------------------------------------------------------------
http://www.csc.villanova.edu/~wthau/383.html
Larry
Thread Starter
Melting Slicks
Joined: Apr 1999
Posts: 2,010
Likes: 3
From: Moon Twp. PA USA
Originally Posted by Larry3x2
Glen: My son had this engine built and wound up having to sell his '75.
I recognize you asked a cam question but perhaps you'd be interested in comparing your parts selection.
--------------------------------------------------------------------------------
http://www.csc.villanova.edu/~wthau/383.html
Larry
I recognize you asked a cam question but perhaps you'd be interested in comparing your parts selection.
--------------------------------------------------------------------------------
http://www.csc.villanova.edu/~wthau/383.html
Larry
Instructor
Joined: Oct 2000
Posts: 137
Likes: 0
From: Flemington, nj 08822 usa
Reply on 383
Glen: Engine is totally brand new with 20 minutes on the Dyno. Should run well with 3.36 and a wide ratio box as it puts out 472 lb-ft @3500. I'm not sure what you plan to use it for. Drag racing would be best with at least 3.70 rear gears. Engine was built by a circle track and drag race builder. My sons contact info is on the engine link.
Larry
Larry
