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  1. GN7 On the Dyno
    I was on a Chevy truck website and a guy on there said he uses starting fluid to find vacuum leaks. I know this is a very bad way to do this. What is the best and safest way to hunt a leak? Thanks for any input!
  2. Jet Boats
    I recently bought a 396 sbc stroker from a buddy. He had it built put it in a drag car made a few passes with it and lost interest. I am am in the process of freshing it up, changing the cam and a few other things so I can put it in my aluminum jetboat. He said it always wanted to blow out...
  3. GN7 On the Dyno
    I was wondering what you guy think about putting a vacuum pump on a blower motor. I always see puke tanks but never a pump. Is there a reason?
  4. Parts for Sale
    Both used. 80508-7 came off a boat that ran great about a year ago, the 9029 one came off my boat this week because the idle was surging and I'm swapping engines and using a different carb so didn't want to mess with it. Both could work fine, both may need rebuild. $100 for both. Local pick up...
  5. GN7 On the Dyno
    Did a leak down test on the motor. I'm good there..Where is the best place to hook up a vac gauge for testing the vacuum pump system? Looking to set up my regulator to 8-10". I've seen a 1/4" fitting welded onto valve covers or to the base of the intake on other deals. Is the the only way to...
  6. Tow Vehicles, Cars and Parts
    I have a brand new in box Holley 08058SA carb 750cfm Vacuum secondary's Sell if for 250.00. Summit sells it for 329.95.. I did just take it out of the box and bolt it on. Never a drop of fuel in it yet tho .. ended up buying a mechanical secondary 750 Quick Fuel from Summit today so this needs...
  7. Parts for Sale
    I have a brand new never ran Aerospace 3-vane vacuum pump $465, vacuum relief valve (not shown) $115 from summit. SOLD.
  8. GN7 On the Dyno
    I came up with this equation to predict performance gains when adding a vacuum pump. I'd appreciate it if you would run the numbers and report back how close the equation is to your actual measured gain. Pretty sure it's nearly dead nuts, but I've certainly been wrong before. Vacuum in...
  9. GN7 On the Dyno
    I am in the home stretch! I have eliminated the turbos for the time being, but I still have my boost referenced carb. Do I plug the boost reference port, or run vacuum to it?
  10. Parts for Sale
    I have a brand new never ran Aerospace 3-vane vacuum pump $465, vacuum relief valve (not shown) $115 from summit. Will take $400 for both.
  11. Parts for Sale
    Factory Refurbished Aerospace Vacuum Pump, looks perfect and has all new internal components from mfg, never run by me. Bought for an engine I ended up not building. Sold! Thanks Tyler! Pistons; CP Performance 4.5" bore, 1.280 compression height, -30 cc dome (about 7.8 CR on 118 cc head), Rings...
  12. GN7 On the Dyno
    what brands are people having best luck with? ( aerospace, GZ, star, moroso ) and is there any to stay away from? thanks
  13. GN7 On the Dyno
    What would be a good number to shoot for on my stealth as far as vacuum? Got a moroso 3 vane setup because under boost I was pushing a little oil out from belt drive. Just want to keep is at a safe level. I was think around 10" but maybe other guys will chime in. I don't want to dry the wrist...
  14. Parts for Sale
    Holley 4160 750 with vacuum secondaries. Brass sight plugs, same flange size as 4150. Good condition. $100
  15. Parts for Sale
    This carb has been sitting a while, needs kit, My carb guy said it was a good carb, but I'm going to a 850 so this one is out. Know nothing about whats in it, Jet sizes ect... But carb is complete no issues other than sitting. $225 shipped.....OBO!!!! Thanks Johnf
  16. Parts for Sale
    Moroso Vacuum Pump System-$450 Moroso Vacuum Pump System -$450 Call Dean at 661-202-5202 Located in Southern California l
  17. GN7 On the Dyno
    Any negatives about running a vacuum pump on a blown engine.
  18. GN7 On the Dyno
    I am adding a vacuum pump to my twin engine boat motors. I am looking to pull around 10 inches. What brand would you recommend that will stand up to weekend use during the summer?
  19. GN7 On the Dyno
    So here is the question. If you were to make an upgrade which would you do and why? Upgrade to a vacuum pump or a dry sump? Which will yield the most bang for the buck hp increase? What is the average cost for each upgrade roughly?
1-20 of 33 Results