Hey guys need a little help with my tune I'm working on

[fastacton]

I'd go with a 454 throttle body and injectors (for more airflow as well). I also always go overkill on the fuel pump as well, I prefer to have extra capability rather than just enough. The Vortec heads are a good bit better than other factory heads, so to get the most out of them, you need more fuel than the stock 350 injectors can provide. Quite a few people have swapped to these heads and I believe just about everyone who has tried has ran out of fuel with stock injectors and pressure.

[Jwathen23]

Ok that's about right then... didn't know there was so much to do in order to switch to vortec heads lol... I have the tpi fuel pump I'm installing today and I'm going to a local you pull it place they told me yesterday 80$ for a 454 tbi... but they don't have inventory so doesn't know if he has one or not... worth a shot to check it out.. any particular vehicle that's best for the 454 tbi?

[Jwathen23]

Also what fuel pressure should I run with the 454 throttle body... and if I can't find the 454 tbi what fuel pressure should I run with the stock tbi and injecters on my truck now? Im installing this tpi fuel pumo either way.. and what formula are you using to find out the fuel pressure?

[fastacton]

Get a '93 or earlier 454 throttle body (preferably with the same TPS connector, but adapters are available for that and the IAC). The 94-95 version has smaller injectors and runs a higher pressure. The '87-93 454 TB runs the same fuel pressure as the small block stuff, so nothing to change there. Also, remember that the throttle bores are larger than the 350 version, so you need to have the appropriate intake or adapter.