5.3TURTLE

After doing a few hours of research, I have come up with 3 cams to choose from.
The motor is a factory from pan to intake 5.3 with the 706 heads. it will be going in a fox body coupe setup for open track/street cruising, th350, irs rear with prolly 3.55 gears (factory gears in irs). I want to stick with a low lift cam for ease on valve train. Heres the 3 cams:
ASA 226/236 @.050 .525 lift 110 LSA
Texas Speed 228R 228/228 @.050, .588"/.588" Lift 112 LSA
Comp XR277HR 224/228 @.050, 534/537 Lift 112 LSA
Spring recommendation would also be great along with any other cam.
Thanks

Darth_V8r

iTrader: (4)

with stock 706 heads, I would go with your third option. comp 918 or PAC 918 springs ought to be enough to control the valves. The ls6 springs could handle the lift, but you might want higher pressures.

look into higher stall speed converters for that as well.

5.3TURTLE

Thanks for the info.
Im leaning towards a 2800-3000 rpm stall

5.3TURTLE

Also, will factory length push rods work or will I need to check length when I install any of these cams?

Rise of the Phoenix

iTrader: (27)

It's always best to check for pushrod length. You may also want to checkout Cam Motion's website. I believe they have some self cams for the 5.3.

5.3TURTLE

Thank you, I did check them out I found the valve springs cheaper there that I was looking for! I did check out their cams but nothing I was crazy over.

Rise of the Phoenix

iTrader: (27)

You could also get with Kip over there and have him custom spec you a cam. Martin at Tick Performance could do the same.

5.3TURTLE

That's not I bad idea. I used off the shelf cams for the past 2 engines, ill talk with them before buying and see if it would be much benefit.

99Bluz28

iTrader: (35)

"I want to stick with a low lift cam for ease on valve train."

Fyi, low lift does NOT make a cam easy on the valve train, the cam lobes ramp rate does.
For example the TSP 228r cam in you selection has very aggressive Comp Cam XE-R cam lobes. That not what you want at all.

For your 5.3 and 2800-3k stall TC I'd go with the Comp XR277HR on your list, or something a little smaller like the XR275HR (222/224 112lsa+2, lift .566"/.568") or XR273HR (220/224 112lsa+2, .530"/.534") , all which use fairly mild cam lobes.

5.3TURTLE

Thanks for the fyi, I should have known that.
Two votes on the comp and I guess the 228r is out.

JakeFusion

iTrader: (7)

FlowTech Induction StreetSweeper-TQ 220/224 .597"/.592" 111 LSA or the FTI StreetSweeper-HT 228/232 .612"/.600" 111 LSA.

Run the BTR Platinums with it and you'll be fine.

Depending on what you want, either would be fine in the truck.

Cam Motion also has similar cams to the above FTI stuff.

The FTI is ground on Lunati cores and has custom lobes which are very stable and are easy on the valvetrain.

5.3TURTLE

thanks Jake, ill check them out.
I just realized there are 2 ASA cams, GM and Howards. I run Howard retro roller lifters in my sbc 406. Like there products a lot and will have to lookup their ASA cam.

JakeFusion

iTrader: (7)

The StreetSweeper-HT will flog that ASA cam.

99Bluz28

iTrader: (35)

As far as I know the "Howards" version of the ASA cam has very aggressive cam lobe ramp rates (advertised duration, minus .05" lift duration).

99Bluz28

iTrader: (35)

Hey Jake, any idea what the ramp rates are on the FTI cams..?

Myself, before I'd buy any cam I'd want to know ramp rate of the lobes used if long valve train life and/or prolonged high rpm stability was on your priority list.

5.3TURTLE

I found that out after reading on it a little.


This is what im trying to find out on any cam im looking at. Trying to find middle ground and so far the comp 277 is the top contender. I liked the street sweeper tq but was pretty aggressive on the ramp rate from what im seeing.

5.3TURTLE

Thanks everyone for the help. I am going with a Comp cam but not the 277. Its the xr275hr, little more lift but less duration. Also picking up the PAC 1218 springs.

Bowtie316

iTrader: (1)

I am intruigued by this formula for comparing ramp rates. Is there a thread that further details ramp rates using this formula and how aggressive they are?

Would you mind if I quoted this in a thread of mine to do some comparisons?

JakeFusion

iTrader: (7)

FTI has pretty aggressive lobes, but they are controllable. So they are fine.

Ed also has this: StreetBeast-TQL 223/227 .625"/.619" 112 LSA which would be a nice aggressive profile in a 5.3L, especially if you were running TFS 205 heads on it.