Cam Selection

-
P

peck_az

Member
Joined
Oct 12, 2005
Messages
9
Reaction score
0
I am planning a mild rebuild of a 318. Headers, intake, carb and cam. I plan to keep the stock pistons and heads. Yeah, I know, stock 318 heads suck. It's a $$ issue. Anyway, I am stuck on the cam choice between the vfollowing 2 cams.

Duration @ 0.05 Lift Lobe Sep Ang
Int Exh Int Exh

MP 759 221 228 0.430 0.450 110
Comp 262H 218 224 0.462 0.470 110

I am leaning towards the 262H because it is a newer grind profile while the MP759 is the old 340 cam.

Comments?
 
What car and weight?
Converter change?
Rear gear ratio is....?

I used a Crane with very similar specs years ago with great results. (4spd.Car.)
 
Edelbrock Performer and a thermoquad carb (e-bay specials!). Looking into TTI 1 5/8 headers but may end up keeping stock exhaust manifolds due to cost. Either way there will be a dual 2 1/2 exhaust with an H-pipe.
 
It is a '72 Scamp with stock converter and rear (7 1/4 POS and I do mean POS vs posi ). Not sure of the rear gears. I am looking for 1000-4500 performance on a budget.
 
If this is to be a street car?,I would invest in some 3.73 gears,28 inch tires,2800 stall convertor and pick a cam to run well from idle to 6500RPM.This would be a good package to run with,not to stock and not to wild either.The headers are good for the street,and a carb of about 600-650 cfm.Now the big item here is the choise of head you are going to run.Have you got different ones lying around,do wish to purchase a set?.If we are on a budget,as most are,I would go with a good set of iron heads with smaller valves so the volocity is kept high and the flow even pretty much through the entire power band,Mrmopartech
 
peck_az said:
I am planning a mild rebuild of a 318. Headers, intake, carb and cam. I plan to keep the stock pistons and heads. Yeah, I know, stock 318 heads suck. It's a $$ issue. Anyway, I am stuck on the cam choice between the vfollowing 2 cams.

Duration @ 0.05 Lift Lobe Sep Ang
Int Exh Int Exh

MP 759 221 228 0.430 0.450 110
Comp 262H 218 224 0.462 0.470 110

I am leaning towards the 262H because it is a newer grind profile while the MP759 is the old 340 cam.

Comments?
Click to expand...


As you have a choice in cams what are the centerlines of both cams as this moves torque around and the power band also. If the centerline is higher on the first cam then that cam will be more streetable, because the cam from comp will be 4 degrees advanced as they do all there cams this way. If the cam from mopar is straight up like 110 int.cl and 110 ex.cl then this cam will be more streetable, it may not give you the lump that you want but then it would work better with the 318 heads.
Being that you have 318 heads don't shun them so fast as long as they are going to be used on a 318. As they have some very good characteristics that are very benificial to the 318. If you have to use the stock manifolds then the comp cam would be the way to go as the less duration will make the manifolds work better, the manifolds will kill all the sound and make it sound stock, but will help with the torque. With the manifolds and small cam the engine will run out of steam around 5000-5500 rpms.


BJR Racing
 
I am planning to keep the stock pistons. Will the Comp Cam 262H work from a piston/valve clearance standpoint?


Duration @ 0.05 Lift Lobe Sep Ang
Int Exh Int Exh Int Exh

262 270 218 224 0.462 0.470 110
 
Either one will work without valve problems, but I have to agree that the comp is the way with what you have.


BJR Racing
 
I 3rd that. A 650 will be nive as well.
 
I would use a 750 vacume secondary with mods, as this allows you to run on a 2 bbl and then use the 4 bbl later if so desired................LOL
 
I have a rebuilt t-quad that I got off of e-bay. The thing is in awsome shape. I pulled it apart to make sure that the internals were OK and it looks good. I like the t-quad because the small primaries allow decent mileage while the HUGE secondaries will flow whatever the 318 could possibly need.

Remember-this is a rebuild on a budget. It's also my first rebuild in 20 years so I want to keep it mild. Another consideration is that I am in AZ and I have to pass emissions so I have to keep the cam selection within reason. Someday I will build a go-fast combo but, for now, it's stock with cam, intake and exhaust upgrades. Goal is a daily driver that can get out of it's own way.

Thanks for all of the suggestions and comments. I have pulled a lot of good info of of this forum.
 
You must log in or register to reply here.
-

Back
Top