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  1. PRHeads

    Got the 572 back, Now lets find some power

    That’s the question you have to ask yourself(since you’re paying the bill)………How much extra power would the X have to make for it to be worth it?
  2. PRHeads

    Got the 572 back, Now lets find some power

    3X is almost 1” taller…….do you have the room? IMO, on a build like this, the “street manners” part will come down to the skill/abilities of the tuner.
  3. PRHeads

    Got the 572 back, Now lets find some power

    I don’t know if there are other lobes with those same specs, that are specifically “low shock”, but the lift/duration/lsa are the same as Quicks cam. Valve lift with 1.5’s is .726/.707
  4. PRHeads

    What Heads ?

    I guess you’d need to ask yourself………how much more power would the new heads have to make to justify their cost? I have ported SR’s that flow in the 360 range. Cnc345’s with a decent valve job(2.25” valve) and some minor blending are in the 380 range on my bench. 572-13’s will require pistons...
  5. PRHeads

    head flow numbers.

    Racing flow benches
  6. PRHeads

    Got the 572 back, Now lets find some power

    For Drag N Drive stuff, lobes that are smooth and easy on parts make a lot of sense.
  7. PRHeads

    Got the 572 back, Now lets find some power

    The carb was too small for sure. I guess time will tell. Looking forward to following along with the upgrades:thumbsup:
  8. PRHeads

    Got the 572 back, Now lets find some power

    Not an EFI guy, so no guidance here. But I do have a question…….. how will you be quantifying the improvements? It’s interesting the comment about the EFI cam profile. It’s not much different from a few I’ve used on higher hp carb applications……… and I don’t think it’s much different than DVW’s...
  9. PRHeads

    Help! New 572 vibration at 3000 RPM

    I hear stuff like that and I just SMH Why wouldn’t they just print you off the corrected sheet? Oh well.
  10. PRHeads

    Help! New 572 vibration at 3000 RPM

    Glad you got it back!:thumbsup: Did you get a dyno sheet?
  11. PRHeads

    head flow numbers.

    Unshrouding the valves may help……….it may not. And it could make things worse. You’d want to confer with someone well versed in reworking those heads before going down that road.
  12. PRHeads

    head flow numbers.

    I have zero experience with those heads. But my suggestion is see if there is consensus as to whether or not the numbers you have for your heads are close to “normal” for that level of work.
  13. PRHeads

    head flow numbers.

    But……if the numbers were in the 220-230 range, would you still be worried about it? I had some heads here not long ago that had been ported. I had flowed the heads on my bench before they got shipped off to be ported. The post porting numbers supplied by the porting service showed nice gains...
  14. PRHeads

    head flow numbers.

    Aaahhhhhh yes…….. racing flow benches.
  15. PRHeads

    440 Pistons In A 400

    And they’re already externally balanced, which means to use an oe replacement 440 piston the crank would need heavy metal. That throws the “budget” aspect of it right out the window. KB400’s FTW.
  16. PRHeads

    RB Head Gasket Water Passages PLUS Locating Pin Discovery

    The two small holes are where they are to facilitate the emptying of the heads when draining coolant from the block.
  17. PRHeads

    One 383 cylinder head to be machined and gone through

    If someone showed up at my shop with a 906 head that needed- Cleaning Bead blasting Magnafluxing All new guides Hardened ex seats Valve job Resurfacing Cleaning old parts Reconditioning valves R&R expansion plugs Assemble head and set spring heights You’d spend around $500-550……it adds up fast...
  18. PRHeads

    Pinging 505 help

    That’s coolant? Wow…….that is ugly.
  19. PRHeads

    Pinging 505 help

    What’s the puddle?
  20. PRHeads

    Pinging 505 help

    You’d think if there was an oil contamination problem it would have been spotted when the heads came off.
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