kickassT/A

iTrader: (3)

just like the title says. also, does anyone know when he switched valve sizes on the stage II 5.3 heads? thanks
Jordan

Country Boy

iTrader: (24)

I believe Rev valves.

Orange Juice

iTrader: (3)

When I ordered my 5.3 stg2 heads in January 04 Jay was using the Comp 977 or 987. I am no expert but I beleive that both of these dbl springs need the pocket milled in the heads. I'm sure someone more knowlegable will step in here.

JZ'sTA

iTrader: (23)

Correct that is the springs he was using, however the question was what valves.
He uses REV valves and claimed they were on backorder for months and that is why nobody has recieved their items.

kickassT/A

iTrader: (3)

thanks for the replies. any one know about the size?

jrp

iTrader: (16)

how old are your heads? if i remember right its either 2.02/1.60 or 2.04/1.60. hell i'd just pull a pair and measure them myself if i were you.

John02SS

iTrader: (47)

The newer heads are REV 2.02/1.575 valves. The setup right before these was a cutdown 2.04/1.575 REV setup. Jay said the 2.02 valve has better flow characteristics.
Hope that helps

kickassT/A

iTrader: (3)

thanks for the replies. if i do get the heads, i will check them with a caliper, i was just trying to get some idea. the owner doesn't know, and i don't really want to have to drive to dallas to find out. thanks guys

Jason99T/A

iTrader: (21)

Every set of Absolute Speed heads I have installed had REV valves.

DanZ28

iTrader: (5)

Mine are a little older and came with Manley valves (2.02, 1.57) and 987 springs. At the time only 987's and 918's were offered from him. If I'm not mistaken, when you use 977 springs you also need to use longer valves because of the spring length. Maybe Jay fixed this with another solution, I don't know...

Dan

Country Boy

iTrader: (24)

I have the newest stage 2 5.3s. I have the Rev 2.04/ 1.60s with Comp 977 springs.