01CamaroSSTx

iTrader: (3)

I have a 5.3 with 862's that I'm installing in a 2005 Tahoe 4x4. The 5.3 in the truck has 706 heads and I know these are identical to the 862's but I'm concerned about the camshafts between the engines. All the camshafts in the 5.3's had the same duration and lift and an LSA of 114° except that the 99's had 115.5° LSA. My question is will there be any issues with how the engine performs if by chance the camshaft in the replacement engine has the wider LSA? I can swap the cams of course but figured I'd ask first.. Thanks!

G Atsma

The early cam MIGHT feel slightly soggier off idle due to the wider LSA, but it's nothing to worry about.

01CamaroSSTx

iTrader: (3)

Thanks man! I was thinking it probably wouldn't even be noticable unless your looking at a dyno.

RB04Av

Probably not...

The one with the wider LSA will idle slightly better, have slightly lower peak torque, and carry the torque to a little higher RPM. Probably not even a 2% difference in any of those things. The one with the narrower LSA will make slightly more torque but will tend slightly more to ping (might need a slightly less aggressive timing curve); again, emphasis on "slightly". VERY slightly.

I doubt anybody will even know the difference actually, even on a dyno; the difference is within normal variation between motors anyway.

wannafbody

iTrader: (2)

Lower LSA should provide a bit more torque down low which is better for a truck. They are close but I'd go with the 114.

01CamaroSSTx

iTrader: (3)

Thanks for the input everyone.. So as it stands right now I've got a 1 and 7 chance of having an engine with the wider LSA on the stand. I have no idea what this came out of and I really don't want to swap the cams as the engine on the stand is a low mileage engine. I'm just gonna throw it and go and use this new foundation for the LS1 parts I was able to salvage from my LS1.

SoCalDave

That is of course the wise choice. However, you could always swap in a cam with more lift and more duration and have your heads ported. It's just a little more effort lol.

01CamaroSSTx

iTrader: (3)

Pulled the passenger valve cover and this is what it looked like. YUK!

01CamaroSSTx

iTrader: (3)

Sorry this was the driver side cover. The passenger did not look like this but was pretty caked up.

68Formula

The engine coming out, or the one going in?

RB04Av

That's very nearly funky.

Castech 706 cracks?

01CamaroSSTx

iTrader: (3)

Coming out!

01CamaroSSTx

iTrader: (3)

Noticed I a sheared bolt in the cylinder head of my replacement engine and snapped an EZ-out into the it. Always something!

Needless to say trying to break it up into tiny pieces to get it out was a no go!

Persistence prevails! Now I can get the manifolds on and drop this into the truck.

Shes's in!

Finally got this thing all buttoned up and its now time for the much anticipated start up.

01CamaroSSTx

iTrader: (3)

Maybe its just me but I think I have the wider LSA cam in this motor, none the less the truck is running great and I now have an Iron LS1 project build in the works.

omc8

iTrader: (7)

Back to stock 5.3 cams go, with the later 114 LSA . Another stock 5.3 cam you might consider is the L33 which had 2-3* more duration ,more lift ,482 but on a wider 116 LSA it will make more peak hp