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  1. 6

    Build My Motor

    The GT-40 or GT-40p heads are very good heads, even under-rated heads for a 302. But they simply don’t have the port volume to support an engine in the 347+ CID range that is looking to make good power up to around 6000-6200 RPM’s. These heads will choke off a 351-357 CID Windsor and cause them...
  2. 6

    Build My Motor

    I would sell the GT40p heads and get a set of good aluminum ones. AFR 185’s are the way to go. If they are too pricey look for a used set of the top brands like Twisted Wedge or Edelbrocks, even an old set of the iron Windsor Sr’s. The GT-40ps will not support the airflow needed for the power...
  3. 6

    Trying to get 300+rwhp....

    Compression... The compression ratio with flat top pistons (+4cc), 60cc combustion chambers, and a .030 overbore should yield about a 9.43:1 compression ratio. That's a decent sized cam to begin with so I don't think you want to go any bigger. If you want more power than think about a roller...
  4. 6

    Help me build a short block combo

    I think you have all the parts for a really nice combo. To gain additional power I would get the AFR 165's ported to match the additional cubes. I agree with others who say that these will match up very well with 331 cubes and a little more proting will make them work that much better. A good...
  5. 6

    Help selecting parts for 351c

    That sounds like a take no prisoners combo, low 11's high 10's potential.
  6. 6

    Help selecting parts for 351c

    For a 400+HP motor that is very streetable I would recommend the following – 750 Holley, Blue Thunder intake manifold, 4v quench heads with 10.5:1 compression ratio, performance cam, 1 ¾” headers to a 2 ½” exhaust, 3.90 gears, electronic ignition. These are just the basics but the vehicle will...
  7. 6

    Cams or Nitrous?

    Thanks for the clarification. Well, if VT 1 cams add 22 RWHP I wonder what the 270s would add......they are a much more aggresive grind. Any idea?
  8. 6

    Cams or Nitrous?

    I was curious about your cam spec's. I am familiar with the Comp Cams XE270AH which has spec's of 234/238 @ .050 .550/.550 lift and 113 LSA, but have never heard of the 270s.....what cam is this, what are the spec's, and do you think it is a good daily driver cam? Something that seems relatively...
  9. 6

    Help with increasing compression ratio.

    To effectively raise your compression ratio you only have a couple of real options. I am assuming that you don't want to rebuild your engine. If you are going to do that then you can get any compression ratio you want. Assuming that you aren't rebuilding the engine the only practical thing to do...
  10. 6

    Cam specs - what do you think

    That is a stout cam for a hyro roller, but the cubes and the Webbers will make ist seem relatively mellow I think. With 225 AFR's why is the cam 12 degrees weighted on the exhaust? I thinkt the intake/exhaust ratio must be near 70%......are you running a 1 3/4" primary header tube to a 2 1/2"...
  11. 6

    Traction Bars

    Cat-Tracs or Comp Engineering traction bars are one of the best traction upgrades you can make.
  12. 6

    New Cleveland heads & intake from Edelbrock!

    Yes, with 5.15" rods and 289 forged pistons.....
  13. 6

    Cam

    ttt
  14. 6

    New Cleveland heads & intake from Edelbrock!

    No a regular RPM Airgap would not work, the lower block height of the 302 (8.2") would not allow it to line up with the heads. Essentially the 302 block is narrower. There were some speciality intakes made for a cleveland 2v head on a 302 block. Some are probably still made in Australia where...
  15. 6

    New Cleveland heads & intake from Edelbrock!

    I still think the 4v heads will run with the new Edelbrocks. I'll wait to see some dyno numbers and flow numbers for the Edelbrock heads. It definitely looks like a nice option, though.
  16. 6

    New Cleveland heads & intake from Edelbrock!

    At the SEMA show Edelbrock displayed prototypes of a new Cleveland aluminum head and RPM style high rise dual plane intake. The heads are a rough take off on the 2v design with a number of twists for improved performance. Here is a link to photos and a more detailed report from someone who...
  17. 6

    Cam

    Before we can recommend something you have to tell us a bit more about your combination. Automatic trans or manual? If automatic what stall speed? Power steering and brakes? Compression ratio? Rear axle ratio? Is that a Performer or Performer RPM intake manifold, or is it an old Torquer...
  18. 6

    351 CLEVELAND MODS QUESTION?

    "Aluminum heads don't look that bad to me in comparison. Hmmm. " Yea I have over $2000 in my quench 4v heads, it is eqsy to spend a lot of money - of course they perform incredibly. The only problem I see with the aftermarket aluminum heads are the intake manifolds, otherwise they are a...
  19. 6

    Holle7 600 on a 302

    What do you mean by "tightened up the tolerances" on the accelerator pump? The 60 MPH hesitation sounds like you need to step up the accelerator pump a size or 2. What's happening is that the butterfly opens up and there isn't enough fuel to smoothly transition the atomization of gas into the...
  20. 6

    Please give your opinions on this combo

    I had a set of GT-40's and had them milled to 54cc's to keep the compression up too, it was no problem. And, yes, the GT-40's do have bigger valves I believe they are 1.84 intakes and 1.54 exhausts. You could always have your 289 heads ported and have slightly larger valves put in and it should...
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