Jefhay6814

Hey guys i've posted a few times on several olds forums about my 350 build but ive had a recent change of heart. I went to the local Pull-A-Part this morning and scored a decent looking 403 block for $80!!!!!!! i have '72 7a heads that have had a little work done (slightly bigger valves, ground down exhaust bump, middle port divider, bolt holes opened up), cloyes double roller, lunati voodoo cam and lifter kit Advertised Duration (Int/Exh): 256/262
Duration @ .050 (Int/Exh): 213/219
Gross Valve Lift (Int/Exh): .485/.499
LSA/ICL: 112/108
Valve Lash (Int/Exh): Hyd/Hyd
RPM Range: 1000-5300
Includes: Cam Kit
Part Number: 10420701LK
with matching valve springs, new stock oil pan with baffle, and a performer rpm. I just wanted to get some advice as to some other things that i can do to wake this 403 up a little. I Just want a nice street car, it'll never see the strip. Thanks for your help guys!!!!!

oddball

I wish getting my 403 core had been that easy!
Go with the dished stock replacement pistons, deck to get the compression you want - probably stay around 9.0 to 9.5:1. I would close the exhaust crossover in the heads. Spend some time with the rest of the valvetrain to make sure it's set up right.
That's the puny Voodoo. I'm settling in the 60803 right now. Idle is causing problems but otherwise it's really good.

You didn't mention ignition or induction, but nothing too fancy is necessary there.

DeltaPace77

One thing I'd recommend, is an adjustable valvetrain kit, as what I did on my engine. I got one from Dave Smith Olds in CA, but not sure he's still doing this. Saves messing around with rocker stand shims, and sets up just like a Chevy small block.

Scott Hamel

is the adjustable valvetrain kit just bolt in or do you need to machine the heads?

oddball

Depends on the kit. The Comp roller-tip magnums are bolt on and really simple. Upgrade them with poly locks instead of the lock nuts.