BBC pump gas motors

Old 03-16-2009, 07:54 PM
  #11  
radicalz
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Originally Posted by ashbros
QUOTE OF THE WEEK

"Too much bump and not enough squeeze"

Thats a classic.
:lol: :lol: :lol: lol....that is funny....not enough compression should be more like 13 or 14 to 1 with that cam....shorten it up...those heads will breath on their own practically...also might want to try changing to a 930 carb or 1000cf....i found out that i did not need a dominator to fast...it just looked cool
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Old 03-18-2009, 04:59 PM
  #12  
supergass
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Originally Posted by slickfuel
Supergass,...........

I also have just built a 505 (4.310 bore and 4.250 stroke)
That is actually a 496 ci,....not 505ci

505ci= 4.350 bore & 4.250 stroke

:roll: :roll:
Your right, my error, but it is bored .100 over
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Old 03-18-2009, 05:03 PM
  #13  
supergass
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Originally Posted by radicalz
Originally Posted by ashbros
QUOTE OF THE WEEK

"Too much bump and not enough squeeze"

Thats a classic.
:lol: :lol: :lol: lol....that is funny....not enough compression should be more like 13 or 14 to 1 with that cam....shorten it up...those heads will breath on their own practically...also might want to try changing to a 930 carb or 1000cf....i found out that i did not need a dominator to fast...it just looked cool

I agree, I do run a 4150 cfm 950 HP now. Seems to be tuned well. Im thinking I am going to go with a duration around 260 and 270 at .050 on a regrind. That should help get a little cyl pressure. Thanks!
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Old 03-19-2009, 02:53 PM
  #14  
onefastcamaro
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i ran a bbc that was kinda small and it ran awesome.. it reved like a small block... still have it here is the combo

454 30 over, 6.385 h-beam rods , steel 4inch stroke crank, srp 26cc dome, 320 cc procomp heads mild port work, compression was 10.86 to 1 with a 39 thou gasket and piston was 5 thou out the deck, cam was comp xtreme energy grind 660 int 666 exh, i beleive it was 11-773-8 set 4 degree's advanced, 38 degree's timing, team g intake with csr 1 3/4 spacer, 1090 king demon carb, powerglide with 1.76 first and 5600 stall brd 9.5 converter in a 1980 z28 with 4.56 gears and 32-14.5 slicks and car weight is 3000 lbs with me in it..

best was 6.35 at 108 mph in the 1/8 and 9.91 in the 1/4 at 135mph 1.29 60 foot
average was 6.40 at 107 in the 1/8 and 10.01 in the 1/4 at 133mph 1.32 60 foot
leaving at 4400 on the brake and shifting at 6400....

i would be looking into the duration and cam event timing and because on a pump gas motor you want a cam that will help you build cylinder pressure and the xtreme energy grinds do this. also make sure you have a good converter builder because you may have a converter that is lazy of the line... i use Brian phaze from bdr in buffalo ny, he has been dead on the last three converters i have bought for different motors and cars, he asks all the questions such as all the engine parts and drivetrain...
just my opinion...
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Old 03-22-2009, 07:54 PM
  #15  
zipper06
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Originally Posted by zipper06
Originally Posted by ashbros
Hey zipper
pretty cool car you have there
The numbers you are posting put you around 780 to 800 hp.
Damb good 1/8 mile number and MPH
The car belongs to my friend i just built the motor for him and tuned it. We run 38 degrees timing and just this week we put a 150 plate shot of nitrous on it probably go next sun to test and tune hoping to get close to the bottom 6's and low 10's with it, if we don't get rained out we've had 5 strait days rain, i'll make a vid if we go and post it with time tickets. Then bolt on the exhaust and drive to Sonic and fill up on burgers, it's got a 10 gal fuel cell, and Sonic is only 10 min. away, it's got lights, alternator, 2 seats and all acesseries except wind shield wipers.

Zip.
Well it didn't do exactly like i wanted it too. We took it out today, with the 150 shot. The 60' was a couple hundreds off, and it started hitting the high side chip at about 1000', so he backed off of it. We had the high side chip ar 6800, and probably needed a 7200 chip. I also had a -7 degrees from 38 degrees chip in it.

It did run [email protected] with backing off at a 1000' which i guess is o'k for the car described in my earlier post. I think it could have run 10.0's but i'm just guessing. I'll go with a 200 shot next time and put a 7200 chip. It might go 9's but again just guessing. It is a 468" 10.2 compression, and weighs 3700 lbs and that in on 93 octane shell gas.

still learning,

Zip.
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