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-   -   421 head selection (https://www.performancetrucks.net/forums/internal-engine-modifications-158/421-head-selection-467933/)

HDGMC 08-24-2010 11:44 AM
421 head selection
 
Ive got a LQ4 421 with 4.125 crank, its in a 02 2500HD. right now ive got the stock heads on it. Im looking for a new top end combo starting with the heads, and not sure what heads to go with. The goal is low end torque but i would like it to scream at WOT. I would appreciate any input yall have

RibeiroBJJ 08-24-2010 01:12 PM
On the budget end I would go with a set of massaged L92's with a L92 truck intake 90mm t-body..
If you have some coin to spend ..a set of Trickflows or AFR's with a FAST lsxrt 102mm intake with matching throttle body..
To make the most out of the combo , and get to your goals have Pat g. on LS1tech spec you a cam..Good luck!

HDGMC 08-24-2010 01:33 PM
What set of Trickflows or AFR's would you suggest?

lethalperformance 08-24-2010 01:35 PM
225s or 235s im guessin

RibeiroBJJ 08-24-2010 03:25 PM
Originally Posted by HDGMC (Post 4525827)
What set of Trickflows or AFR's would you suggest?
Originally Posted by lethalperformance (Post 4525829)
225s or 235s im guessin
I was actually looking at Trickflows 235's or AFR's new 245's...Either one is a great set of heads

HDGMC 08-24-2010 04:36 PM
Sweet deal thanks for the input


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