miguelc

Hi

I live in Guadalajara,Mexico the city is at 5200 feet , scanners read 83kpa of pressure on cars. people here says that cams with tight lsa doesnt work around here.

They use 114 lsa cams , and most of them are below 226 degrees at .050. even on big engines like 7.0 Are their setups wrong? or they learned the bad way what works around here?

I plan to do a high static compression 5.3 ( around 11.5)
with a 220 cam
112 LSA

should I go to a smaller cam on a 114 LSA, or something like the TR cheater on 117 LSA?


Thanks for oyur help

3rdCoastPowerSports

iTrader: (5)

no. go with a cam that will give you some power and make a cam swap worth while... FYI there are guys in Denver Colorado that run big cams with decent LSA's, laydown the power and put up nice numbers.... go with something like a Texas speed 228R @114 LSA... what intake and heads do you have?

miguelc

Sorry, my engine is a late model truck 5.3 (the one with 243 heads)
The car is a foxbody with a 5.3, 4L60 swap
intake is the truck one , headers 1 3/4 with 2.5 duals and magnaflows
I dont want to shift past 6700 rpm ( seems like the magic number) since the rod bolts are stock

3rdCoastPowerSports

iTrader: (5)

i would check out Texas Speeds Website,,, check out the 224 cam and the 228 cam. if you have the 243 casting heads you have got the best stock heads (Z06 corvette heads) and they can flow a relatively large cam with no problem.

if your ride is an auto you are going to need a new stall

garygnu

small duration cams with tight LSA make great pressure (torque).for picking the right cam you need to tell a cam shaft vendor your car weight and gear ratios.look at some thunder racing or EPS cams.

SNLPerformance

iTrader: (15)

Being that the air is thinner up there you want a cam that has good DCR to keep the bottom end from being soft. It's not so much the LSA, but the IVC that determines that and that is why the guys are talking about running relatively small cams is my guess. You have decent static which is good, but the main concern is the octane of gasoline that is available, as at high altitude the requirements are less and they usually only have low grade.

miguelc

We only have 92 octane, but I think it is the same as 91 octane on Texas

SNLPerformance

iTrader: (15)

That's better than 87 which is what you only find at some places in high elevation. What converter is in the car?