67-69 Firebird TECH Includes 69 TA.

          
 
 
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Old 01-27-2022, 12:19 PM
ScumOne ScumOne is offline
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Join Date: Aug 2015
Location: Prescott, AZ
Posts: 282
Default 69 400 YT upgrade...need some thoughts on hp/torque #'s when done...

Ok, so the old 69 FB 400 with factory AC is getting an engine upgrade as follows:

1) it's already been rebuilt to 9.5:1, 17cc dished KB pistons, 9000 miles ago.
2) Want to swap out the #62 head (72cc CC) for KRE as cast 65cc shaved .030 to 62cc. CR expected to be 10.7:1 at that point.
3) KRE recommends the Crower 60243 cam, Comp pushrods, Comp Magnum roller rockers with 1.65" ratio.
4) RPM Performer Intake with my SMI 850 cfm Stage 2 Q-Jet on top.
5) Exhaust is the RARE ceramic coated D port long branch cast iron manifolds, into 2.25" dual exhaust with H pipe.
6) 3.55 posi rear gears, 2004r upgraded tranny as well as TA handling package.

I'm figuring that it's going to come in around 400 hp and 440 Torque. Some of my more learned friends say otherwise... as in less.

Anyone have an idea or done this before without the stroker 462 setup and just the 400 .030 over??

I appreciate your time and thoughts!

Jim


Last edited by ScumOne; 01-27-2022 at 12:43 PM.
 


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