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  • First bbc 427, 3904390 heads questions - Hot Rod Forum
    Oval port heads ( 290, 390, 049, 781 included) will hit the factory style forged pistons on open or closed chamber Because of smaller intake exhaust valve and tighter chamber in this area
  • 454 compression ratio questions (please help!) | Team Chevelle
    I had the same problem,flat tops same heads I bought domed hypertec pistons to get a comp 10 25 to one with the 049 heads The 049 heads cc to 122cc or higher on evey set that I had I think you havs a couple choices buy new pistons,smaller chamber heads or buy a cam that can build cylinder pressure with your current setup Good Luck
  • 402 with 454 heads. . . good combo? - Team Chevelle
    That XM278H-12 while have all the Torque and Rev's you require with them Gears and light the tires easily PS: If your pistons are Flat top and you aren't about to change them forget the 049's and get a set of 98 or 101cc Closed Chambered heads
  • 402 Experts. . . Tell me what you know | Page 3 | GM Square Body - 1973 . . .
    The bore is not big enough to utilize a 2 190 1 880 combination The 049 - 781 head has to big of a chamber for a 4 125 bore, you would need a big dome to make this work, then heavy metal to make it balance ]The best combination IMO is to use the 292 head (402) with a 2 100 1 780 valve combination with mild port work Way more than 400
  • Complete Cylinder Heads Guide for Big-Block Chevy Engines
    Look under the hood with CarTech Books’ complete cylinder heads guide for big-block Chevrolet engines Like what you read? Get the full book to learn more!
  • stroke that 396-402 bbc with a 4 454 crank or even 4. 25
    use of the externally balanced damper and flexplate or flywheel on a 4" or 4 25" stroker crank in a 396-402 will be far more cost effective than internal balance components on most applications!
  • Chevy Pistons 396 402 BBC Pistons - campbellenterprises. com
    High strength forged piston set for use in stock and high performance 396 402 engine Set includes 8 pistons 8 wrist pins Piston rings and locks Centered pin Closed chamber design Part number 9948 @ STD will fit a 030" over 396ci Part number ic9948ktm-std
  • 402 Pistons - Team Chevelle
    I would use (Sealed Power Federal Mogul) Speed Pro forged pistons, which are superior to cast pistons I just purchased a set for my 060 over 396 375 HP and opted for the original L2242 model, which produces in the neighborhood of 11 0:1 compression when mated to original equipment "840" rectangular port heads
  • 396 build up questions | The H. A. M. B. - The Jalopy Journal
    I put together a 396 one time using standard bore pistons out of a 402 Zero decked the block, cut a set of closed chamber oval port heads for 2 19-1 88 valves ported the **** out of them and angle milled them 100"
  • help selecting head gasket BBC - Team Chevelle
    what head gasket would you guys recommend for a 30 over 454 with 049 heads? The engine has been zero'd decked and I will be spraying nitrous (200) If you can included summit racing link that would be great, my head is spinning from all the different selections also recommendations on head bolts or should I use studs?
  • 049 heads, piston selection - Team Chevelle
    Well, long story short, I had the heads ported and picked up 8 to 26 points on the flow bench Money well spent I think $500 00, 40 hours labor? Anyway I got with Chris at Straub This is a 489, 4 25 stroke, Scat 9000 series crank, 6 385 Scat I-beams I thought the heads would land around 119 cc on the chambers
  • don,t ignore the potential of a 402 BBC rebuild, but think things . . .
    In the case of the rolled-over 100cc head, the best information I have is your existing 1971 factory piston or aftermarket equivalent should be OK, but—because the head is angle-milled—don’t exceed a 0 150-inch dome height on a zero-decked block (piston deck is flush with the block deck at TDC)





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