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  1. PRH

    J head porting

    FWIW……..you don’t really need to do any of that “boat-tailing” behind the guide to reach 240cfm. After you have the seats cut for the 2.02 valve……you’re going to have a bunch of blending to do.
  2. PRH

    Well I ordered myself some new valve seat cutters

    I can tell you this……. At my shop, it’s pretty easy to spend $1000 on refurbishing old factory iron heads. About a year or so ago, a friend with an auto repair shop dropped off some pretty undesirable SBC factory heads. They came off some smogger 350 that had been stuffed in an Elcamino, and it...
  3. PRH

    TF & Speedmater Flow Tests

    A couple of random thoughts…… - lowering the seat .090” takes away what I feel is valuable length on the floor from the apex to the seat -I don’t feel you can actually fix the SSR by playing with the seat angles. The seat angles are more about pressure recovery as the air moves thru/past the...
  4. PRH

    I THINK I KILLED THE 340

    I’d push the easy button with the thicker gaskets.
  5. PRH

    Steve Dulcich on building a budget 318

    7 pages in a day and a half. It’s like there were never any budget 318 threads here.
  6. PRH

    Racing flow benches

    One thing I forgot to mention in the beginning of this thread is…….. Both of the flow benches used are the same make and model. A Saenz S-600, which is essentially an Argentinian built copy of a Superflow SF-600.
  7. PRH

    OK I'm confused on MOPAR Tunnel Ram P4532175

    The casting numbers are not the “part number”. The part number is what’s in the catalog…….and on the box. W2’s have different bolt spacing than std heads. Just lay a std gasket against the manifold and see if the bolt holes line up. My old MP catalog does say the w2 TR has oval ports, but the...
  8. PRH

    Cam Curious

    FWIW, the only aftermarket Mopar v8 FT cams I’ve ever seen that weren’t parkerized(black/dark gray lobes) were from Mopar. The cam in the pics isn’t parkerized. I’ll add that based on the looks of the shape of the nose of the lobe in this pic, I’d guess it’s noticeably more duration than a...
  9. PRH

    Competition Products Cylinder Heads??

    Perhaps, but they aren’t the same casting as the Stealth heads. There is more height at the SSR compared to the Stealth.
  10. PRH

    1972 Dodge Colt

    I’m not sure I get what you mean by .100” cut on the valves.
  11. PRH

    Competition Products Cylinder Heads??

    Both Ootb, The ones I’ve had here flow more than the Stealths do. In the 260’s……..and on my bench stealths are typically in the 250’s.
  12. PRH

    Competition Products Cylinder Heads??

    Maybe? That would be different. I’ve done about 1/2 a dozen sets of heads “that look just like those”……..my recollection is they were in the 83-85cc range after recutting the seats.
  13. PRH

    Bob Glidden car at TNT yesterday!

    Does it have a “correct”, or correct-ish engine in it? Good to hear it’s out doing what it was built for:thumbsup:
  14. PRH

    Competition Products Cylinder Heads??

    Looks like the same casting that’s been offered thru SM, Sidewinder, Promaxx, Performance world, Bruce Toth……to name a few. The visual clue is the thicker than usual divider wall between each pair of intake ports. The castings are fine, but they don’t flow 300 on the intake side as cast. It...
  15. PRH

    Bob Glidden car at TNT yesterday!

    Real deal or recreation? Cool either way. What did it run?
  16. PRH

    J head porting

    Are you saying those SM heads that flow 250 ootb are looking better and better?
  17. PRH

    Roller Block: Pushrods Rubbing Against Head

    Not helpful I know, but……. 308 heads are LA heads. Some of the best flowing actually.
  18. PRH

    383 power upgrade help

    .030 over 383, pistons down the hole .080, steel shim gasket, 80cc heads…….. puts it at about 8.5cr. Should work fine.
  19. PRH

    TF & Speedmater Flow Tests

    That’s my suspicion…….. but I’ve never done any testing to confirm or deny it.
  20. PRH

    TF & Speedmater Flow Tests

    I missed this earlier: What I meant was any port form that has some obvious separation issues vs one that doesn’t. I’d say the change in sound you hear at .400 up is the signal “something” isn’t as happy as it was before the sound changed. Fwiw, that’s pretty much par for the course on any...
  21. PRH

    TF & Speedmater Flow Tests

    That last data is for the SM head or the TF head? Without having that seat velocity map to go by, at what lift did other indicators present that something wasn’t happy? At .400…….. or after that?
  22. PRH

    383 power upgrade help

    In the mid/late 80’s I re-ringed several BBM’s that turned out pretty well. Same formula for all of them. Get the block & crank hot tanked Dingleberry hone bores Polish crank New cam bearings and expansion plugs Heads reconned(only what they needed, generally a valve job, new ex guides...
  23. PRH

    2019 summer race.... Jadaharabi vs 318willrun

    Summer 2019 is just around the corner!!
  24. PRH

    383 power upgrade help

    How much less to recondition them compared to a set of $1400(plus shipping and a tax) Stealths? At my shop the price would likely be pretty close…….depending on exactly how bad the oe heads are.
  25. PRH

    TF & Speedmater Flow Tests

    If the customer dictates a smaller chamber, and that affects the final flow numbers, then ……… “iiwii”.
  26. PRH

    TF & Speedmater Flow Tests

    My suspicion is, especially when working with a low port head that doesn’t have a lot of height at the SSR, that even ports that seem to have a form that allows the flow to stay connected to the floor(no real obvious change in sound, and flows not backing up), that they still end up having areas...
  27. PRH

    How close is good enough regarding installed height

    The “easy to obtain” shims come in .015”, .030”, .060”, ……so, fundamentally you should be able to get within .015”. I’d want to be way closer than .060” ………. Assuming the height you’re targeting provides the desired/correct spring force.
  28. PRH

    TF & Speedmater Flow Tests

    I wonder if…….. One were to rework one of the SM ports to a lesser extent than what’s been tested so far, concentrating primarily on getting SSR area sorted out so that it would allow the flow to show increases past .600 lift…….even if the flow capacity at those lifts is below the current 285cfm...
  29. PRH

    ATM/Holley verses Carter 625 AFB

    None of my dyno mule carbs are anything too special. But they are drama free when breaking in a new engine. I have 3 that I use most of the time. 4779 750, 4781 850, home built HP950. Those have me covered for most builds between 400-700hp. There’s also a pretty good working 1150 Dominator at...
  30. PRH

    ATM/Holley verses Carter 625 AFB

    I could be way off base here, but my guess is the main purpose of the test was to try out the new carb. I’ll just throw this out there…….. I’ve done countless carb tests on the dyno. Usually it revolves around quantifying that the engine owners carb isn’t a power robbing turd. So it gets...
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