Generation IV Internal Engine - Busted lifter, trashed cam....Need opinions!

I had a lifter/s take a shit on me, trashed the cam....

So now I'm face with a dilemma, do I get a new cam (same specs) or go a little bigger?

The car made awesome power for being a bolton,cam car, and with a little custom grind cam. Not that dyno numbers are everything, but its one of the highest bolton/cam ls2's I've seen, and whether it came from the cam or I just have a strong motor I don't know.

Anyway, here's the dyno sheet....450/414, on 91... at Cunningham Motorsports (Murietta, CA)
Also made 458/415 on a mustang at Craven Performance (St Peters, MO)
-Svede
-FAST 102
-Cam
-UDP
-LT's, 3" Catless, Super 40's

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What lifters?
What are your cam specs now?

I'd say if you've been perfectly happy with you current cam I'd keep the new cam specs about the same, maybe go with lobes with different ramp rates, slight increase/decrease in duration and/or lsa if you feel these slight changes will get you closer to perfection. Otherwise don't change a thing!

What lifters?
What are your cam specs now?

Stock LS2/7 Lifters.

Low 230's and 600ish lift.

Ok so here's my parts list so far

So here's I've got going....feel free to point out anything I should add or change.

ARP Hex Head Bolt Kit - $109.99
GM LS2/L92/LS3/L99 Cylinder Head Gaskets - $73.98
GM LSX Harmonic Balancer Bolt - $4.99
GM LS7 Lifters - $139.99
Texas Speed Ported LS6 Oil Pump w/ New O-ring - $195.98
New cam (same specs) - $355

Debating on these-
Katech C5-R Timing Chain (LSx) - $149.99
SLP Timing Chain, 2005 LS2 Double-Roller - $139.95

GM LS7 Lifters - $139.99
Lunati Street Linkbars - $375.86
-"Designed for engines with a maximum RPM operating range of 6200 - 6500" I run mine to 7000...any input on these being more/less reliable than the LS7's because of the extra RPMs?

Valve Springs....
Currently running Patriot Extreme .660 lift springs.
30k on them. They're off the heads and everything looks perfectly normal. Any reason to be looking at getting new ones?


And as far as the rockers go..stock with 96k on them. Normal wear, but everything checks out. I was going to get the comp trunion upgrade and just change them out. Any reason to order a whole new set of rockers with the upgrade?


Pushrods are hardened 7.400's. I'll be double checking the needed length and ordering new ones if need be.

Just curious, have you had the block checked out for damage?

Seen trashed lifters screw up lifter bores.

What were the specs on the old cam?

S10 - Dont have it out yet. But I'm going to pull the pan and check for metal etc... Also will be pulling the caps and checking out the bearings while I'm there. Trying not to pull the motor and tear it down (if it doesnt HAVE to be done) because I'll end up spending a ton of money building something ridiculous.

Blackonblack - that was the first thing I though about, but i checked them with a borescope and they look fine.

Martin-230/232 .613/.603 112+2

I keep hearing to replace the valve springs. 30k too much on them?

GM LS7 Lifters - $139.99
Lunati Street Linkbars - $375.86
-"Designed for engines with a maximum RPM operating range of 6200 - 6500" I run mine to 7000...any input on these being more/less reliable than the LS7's because of the extra RPMs?

Valve Springs....
Currently running Patriot Extreme .660 lift springs.
30k on them. They're off the heads and everything looks perfectly normal. Any reason to be looking at getting new ones?


I would just use the LS7 lifters, I'm not sure if the extra weight of the tie bar lifters is worth it.

I would replace the springs, I have just the springs for $129 shipped.
http://www.briantooleyracing.com/660-lift-extreme-dual-springs.html

Thanks Brian.
I'm going to use the LS7 lifters.
I called patriot today and he said that normally 20-25k is time to replace.
Youre cheaper than them so I'll save that link for when I start buying parts!

Thanks Brian.
I'm going to use the LS7 lifters.
I called patriot today and he said that normally 20-25k is time to replace.
Youre cheaper than them so I'll save that link for when I start buying parts!

You won't be disappointed with Brian's springs. We've used them a lot lately and really like the quality of the kit and the weight savings on the retainers is a huge plus.

valve float causes this... roller hammers the cam lobe. Doesnt matter what lifters you run. If you dont have correct spring setup this will happen everytime.Run more pressure then you need.

Be careful using more than 400 open lbs. of pressure and stock rockers.

Tooley has done hundreds of hours of spintron testing with stock rockers and springs with more open pressure than should be used with stock rockers and it eats the valve stem tips up over time.