mikeyt

I've got a 92 rs 305 with blown head gaskets. Gonna get the heads worked at a machine shop and was wondering if there's any help to let them breath better. I know porting and polishing of course. Would anybody recommend going with a 1.84 valve in the intake side and shaving 0.020 off the face to help compression?

dmccain

iTrader: (2)

Take them to the nearest scrap iron place, sell them and find some 081 TPI 305 heads or L30 Vortec 305 heads. Don't waste a dollar on them. They are simply not worth it.

big hammer

1-- trick flow 175 heads

2--- 305 vortec heads

3--- TPI 305 heads

9,876--- rebuild the stock TBI heads

mikeyt

How will I know if they are L30 Vortec 305 heads or 081 TPI heads, what do I have to look for-casting numbers, if so what are they? What's better about those?

mikeyt

Can I use the same rocker arms that are on my current ones?

mikeyt

Are there certain vehicles that apply i.e. Tahoe, c/k 1500?

mikeyt

Will a 520 or 059 casting number work?

mikeyt

The only ones I've found are for 1996-2002

mikeyt

Finally, do I have to change my intake manifold or can I reuse the stock one since it's a TBI car?

dmccain

iTrader: (2)

On the Vortecs you can use a Vortec Carb manifold and get an adapter to use your TBI. Lots of people go that route being the Vortec TBI manifold is a bit pricey.The 081s will take your stock manifold.

mikeyt

Tomorrow, I'm picking up a set of Vortec heads and intake manifold from a 96 c-1500. Will my current tbi work with that manifold or do I need an adapter plate for that also. If so, does anyone know the part number?