Save your money on the maf and tb spacer. The maf is big enough to not be a restriction and a lot of the aftermarket ones tend to have issues. Additional intake volume isn't needed on a dry intake. The pulleys actually do help to a small extent. There are several companies that offer a ported and polished stock tb or can do yours, rv morse comes to mind. I would also consider a set of 1.6 ratio full roller rockers. You will need narrow body, self aligning, 3/8" stud. I like the scorpion brand. I've never heard of a complaint about valve train noise from anyone running them but I can't say the same thing about other brands.
When I bought the truck it had a gramantelli MAF on it. I left it be. A Placebo spacer wont do anything since it as no change to the intake runners. If there was a bolt on intake that supported stock fuel but have higher runners i'd run that over the spacer. Obviously port match it to the head.
So UDP's actually work on these trucks. Do you recall which pulleys it replaces? Crank, wtr pump, ps pump right?
When I do decide to go about swapping heads (i've built them already just need to get an appropiate cam and do the swap. Just been a lazy ******* that dosnt want to open his wallet
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Nothing too crazy
Ported factory vortec heads
screw in studs
beehive springs for .550 lift
1.6 ratio roller rockers. Ironically I got scorpion aswell, Got em through summit.
And I'll get a long duration medium lift (440,450 range with 1.5 rockers) I'm thinking 113 LSA. Might go down to 107 if I cant decide on anyhting that has 113.