Help, what size engine for my cam

[ute469]

Last year I ended up buying a cam on ebay, from the states got it at a good price.

This sale is for a General Motors LS1 Camshaft with the lobe numbers> 4418R/4050R R12 B7658. Specifically the cam specs check out at 276/280> (intake/exhaust) @.050", 112 LSA, 112ICL (no advance), .703"/.680" lift> with 1.7 rockers.


Now the question is, what would it suit, large stroker, or destroke and chase large RPM's. When i got this i was kinda hoping that there was a typo or something some where, but no, the cam is that big. I know its not a real street friendly cam, well not at all, but still, keen to hear everyone suggestions.

If not just will be an oversized paper weight

[Y55-7UT]

jesus crist



dur 276/280> (intake/exhaust) @.050"
valve lift with 1.7 rockers .703"/.680" 112°

This is the biggest comp cams off the shelf cam i could find


MECHANICAL ROLLER-High rpm street/strip


rpm 2400 to 7000
advertised 286 293
dur @ .50" 251 256
valve lift w/1.7rr .660 .655 113°
camshaft for large cubic-inch Gen III applications.
Intake upgrade strongly recommended.
Programmer and valve spring upgrade required

so obviously for the size its gonna have to be a mechanical roller setup, what i wanna know is the size of cams used in the 7L stroker motors people are building as i didnt even know a cam that size existed....

id wouldnt bew ideal for a paperweight unless your desk is made of titanium, im thinking along the lines to hold your letterbox up

[Leatherman]

If you don't want it mate I'll buy it off you :) I'm looking for a big camshaft.

Cheers,

Leatherman

[Brandonsdad]

Last year I ended up buying a cam on ebay, from the states got it at a good price.

This sale is for a General Motors LS1 Camshaft with the lobe numbers> 4418R/4050R R12 B7658. Specifically the cam specs check out at 276/280> (intake/exhaust) @.050", 112 LSA, 112ICL (no advance), .703"/.680" lift> with 1.7 rockers.


Now the question is, what would it suit, large stroker, or destroke and chase large RPM's. When i got this i was kinda hoping that there was a typo or something some where, but no, the cam is that big. I know its not a real street friendly cam, well not at all, but still, keen to hear everyone suggestions.

If not just will be an oversized paper weight

Normally people buy the engine first and then get a cam to suit.

That is one big cam there.

[GMMAD]

that is one big cam you will need some serious mods to get the most out of it

[BigJim]

If you don't want it mate I'll buy it off you :) I'm looking for a big camshaft.

Cheers,

Leatherman

You might need a 8000 stallie to match that cam mate. :rofl:

[ute469]

j im thinking along the lines to hold your letterbox up

Too short for that

Leatherman, i actually would like to use the cam just been told i need to rev to around 9500, but not to sure what size stroke.

[TAKEITEZ]

i'm thinking... something well over 450 cubes might be a start... whoa
that has to be the biggest spec'd cam i've read about in a long long time!!!
i thought 250's on a stroker was pretty wild...

good luck with it anyway!!!

[ova400]

Who did you buy it from, was it a performance shop or just a person throwing it all together, find out what they were going to use it for and go from there. Sure as hell will get you noticed anyway you go with it.

[ute469]

From what i can remember it was going in a 408, drag engine but the engine was sold with dyno time and the cam removed as it was to big for the new owner.

Just with reading this forum for a while it seems that the bigger cams in strokers behave on a little better, but one of Unlce Tone's threads about destroking, sorta got me thinking, would it be safer to turn a smaller crank harder, i know spinning at the high rpm's aren't that safe, but safer than turning a longer throw.

[SS Enforcer]

You also might want to invest in a valve spring manufacturing company as your going to be swapping em pretty regularly.

This is a pretty similar spec cam to the V8 supercar teams run I think.

cheers

[ova400]

You could go for a big bore engine, standard stroke.

[LS1-5.7]

It's a bit like buying the tie before the suit is it not ? It may be easier to buy the donk you want and THEN a cam to suit it and your needs. Surely someone will buy it from you so you can buy another without too much $$$ loss. Setting up and driving a motor suited to that size cam may be an expensive and impractical solution unless you want a 10 second car to go shopping in......

[ute469]

unless you want a 10 second car to go shopping in......

Well its not like i drive the car everyday as it is and really just curious to see people opinions of what it would suit ideally. Like I said earlier i do want to use the cam, but was all set on a big stroker, until the topic of destroking came up a couple of months ago and now it really has me thinking.


But also going to get the cam rechecked again tomorrow, just had a few other people question it again, and it has been a while, I could be wrong.

[STATIE]

Jeez - even mine isn't that big - the lift is a bit weak though.:lol:

[Hqcoupe350]

Umm, if you were going to the trouble of building a BIG HP engine, wouldnt you have the cam custom ground to suit the combo? Camshafts arent very expensive in the grand scheme of things. Anyone can grind you up all sorts of monstrosities, but a BIG cam doesnt mean shit if its in the wrong engine.

[LS1-5.7]

No probs 469, I've seen alot of overcammed cars is all and u can actually go backwards in performance if the cam, lungs (intake/exhaust systems) and fuel demands of an engine don't match. Good luck with whichever you decide.

[ute469]

Yeah well see what happens, got the cam at a mates place now getting profiled just to double check the specs. Tried to profile it today, but the chuck jaws were either to small or to big, so left it with him to sort out later.

[Brumby]

be sure to check pistion to valve clearence when you fit that cam. Are the durationspec advertised or @.50

[seedyrom]

but one of Unlce Tone's threads about destroking, sorta got me thinking, would it be safer to turn a smaller crank harder
:rofl:

Ummm ... no offense to anyone, but I'd look at proven engine builders setups ... rather than an Uncle Tone "What If ..." hypothetical for my engine build
:rofl: :rofl: :rofl:

I've only ever heard of one 5.3L destroked LS1, and it had no low down torque.

Stick with a big cubed stroker if you're gonna try and do something witih that bad boy ;)

[ute469]

Spoke to an engine builder yesterday, so its all in hand.