MikeD.

Had a question in regards to the PRC 2.5 5.3 heads. Would be going on my lq9, which currently is running a TV2 cam, long tubes, TBSS intake w/ 87mm TB. I have a Yank 3400 9.5 stall/4l80e, in my 06 single cab sierra. Just wondering what kind of gains I would be seeing with these. Probably have them milled to 61/62ccish chambers. Im looking for more power under the curve really, and wondering if heads will add power all over, or mainly peak power? The truck make good power now, 415hp/400trq (through a DynaPack though, which are very happy I know) but I'm not looking at numbers really, just seeing what kind and where the power will come in. I've never had an LS motor with heads, so no sure what to expect? Any input?

Also, as far as head bolts go, is ARP a must? Or will NEW stock bolts be sufficient with stock .051 MLS gaskets?

Thanks guys!

HCI2000SS

iTrader: (2)

I have these heads on my LQ9, and with 11.5:1 compression the do do really good for what they are imo

MikeD.

Oops, just realized that this is Gen IV, mods can you please move this is Gen III??

thompson

iTrader: (4)

Those heads would work very well on your setup, and make power across the board. Over a stock cylinder head I have seen these pick up north of 30rwhp.

Thanks
Aaron @ Thompson Motorsports

HCI2000SS

iTrader: (2)

I actually run those heads with one of your 370 LQ9 shortblocks. It runs quite a bit harder than the same heads on my old LS1 setup

thompson

iTrader: (4)

Great to hear! Please let us know if there is anything I can help you out with in the future.

Thanks
Aaron @ Thompson Motorsports

MikeD.

Stock head bolts be ok for 450ish?

thompson

iTrader: (4)

You should have no problem MikeD.
Thank you,
Kyle
Thompson Motorsports