hi all new to the site I have a 03 Silverado engine im having the lm7 rebuilt and I wanted know if ill run into any trouble after my build .


so far I have stock dished pistons replaced my 862's have been milled
.35 for compression and im running a .39 ls1 gasket stock length PR
and isky bumpstick 222/234 560/570 112+2



will I have ptv issues with the heads and gasket combo ?

 

Why such a huge I/E cam duration split for a 5.3?

 

Racecar?

 

the split on that cam is way to big for cathedral port heads.

 

If I did my math right you have around 56cc heads. To be completely honest I would check for PTV clearance? I feel like the intake will clear, but the exhaust might hang long enough to kiss your piston. If it were my build I would not chance it! DO the right thing and check the PTV!

 

good running streetcar,and Im having my cam grinded now so what do you think would be a good split for my duration ? and I maybe wrong on the exact mill # but Im suppose to have 58cc to tell the truth I though the split on the cam was rather small
compared to a ls6 cam 204/218@.50 .550/.550 lift 117.5 LSA im kinda of new to this so forgive me if I sound like a noob the car is 3300 with me in it

 

not sure if it makes a difference but I called my porter up he stated heads are milled to 58cc and 2.02 and 1.55 are installed on head

 

upper 220 duration since your set up is so light. I'd limit the split to 4 degrees honestly. Like a 228/232

 

thanks blue if you don't mind me asking why such a small split ?

 

also the stall is 3200