|12-13-2012 10:04 PM|
|12-13-2012 07:37 PM|
|SPEED MASTERS CC||
|12-13-2012 07:35 PM|
|SPEED MASTERS CC||
|12-13-2012 04:49 AM|
Your current compression is 11:1
0.04" head gasket=8cc
deck height= 0
(785 + 64 + 8 + 6 + 0) / (64 + 8 + 6 +0) = 863/78 = 11.06:1
if you use 76cc chambers then the cr should drop to 9.7:1
(785 + 76 + 8 + 6 + 0) / (76 + 8 + 6 +0) = 875/90 = 9.7:1
I would use a good aftermarket 76cc head with a 200cc or less intake ports with a set of headers. However, if you plan to use stock exhaust manifolds then using the 882 heads would work ok.
|12-12-2012 10:26 AM|
|12-11-2012 11:19 PM|
You could always keep the comp ratio you have with a 64cc head and convert to E85 it really a simple procedure cost around 300.00 and you can run almost any comp ratio up to 15/1 and they are selling E85 at almost every speedway,meijers,costco. We are running a 14 1//2 to 1 383 on E85 and it runs awsome just buy the carb conv kit for 140.00 and for your build you could use a mechanical compatible fuel pump 120-140.00 or an allstar black with proper reg im building almost every street car that we run at this time to use E85 do some research Its def an option, MIke
|12-11-2012 10:13 PM|
A pair of 441 heads would be marginally better but I wouldn't go chasing them, either.
Anyway, even w/a "perfect" 0.040" quench distance, the CR is only about 9.75:1 w/76cc heads. Measure how far down the piston is at TDC and choose a head gasket accordingly to maximize the quench.
And it's always a good idea to CC at least one chamber from each head you plan on using to be sure they're equal to each other and that they've not been milled excessively.
There are guys here who'll give you recommendations on cams, I generally don't, except to say the 280 Mega is not what I would use. A cam having a faster lobe w/less duration @ 0.050" lift will give you better power under the curve than that old-school stick. Think Lunati Voodoo series, for example. If you're going to use the 882 heads, especially w/cast iron exhaust manifolds, use a dual pattern cam. The 280 Mega will want a bit more CR along w/a loser torque converter (if AT) and lower rear gears than a shorter duration cam w/the same lift.
Use a dual plane intake like the Performer RPM or Weiand Stealth p/n 8016. A squarebore 650/670/700/750 cfm vacuum secondary carb will work well w/this. So would long tube headers.
|12-11-2012 06:30 PM|
383 comp drop
Either head will work the steam holes only play in on the 400 sbc you will not even notice they are there on a 350 with 350 head gaskets the 882 is a good at best budget head just because of the hardened seat they have but as far as performance they will do what you will need with the exaust and induction you are planning to use if you are planning on a good street toy and the cam you mentioned keep the valve size to the 194/1.5, it will help keep the torque you'll want ,be carefull not to sink too much cash in the heads any more than 300-350.00 would almost not be worth it you can get several deals on heads on line already done or new ones from aftermarket companies for around 400-600 for better flowing and better castings that will already come with screw in studds and guides just keep the runner size on the 170-190 to not over build the engine with your parts of choice, hope this gives you some information that will help, mike
|12-11-2012 05:27 PM|
|SPEED MASTERS CC||
Need to lower comp. 383 sbc build
I purchased a new 383 short block with a zero deck and flat tops. (Cheap price, could not pass up...) I need to lower the compression into the low 10-1 range so it will run on pump gas. I have 2 pairs of 882 heads that are 76cc. One pair is drilled for steam. Are these heads worth using on a budget street rod build? Both pairs need rebuilding. Can the steam holed heads be used on a 350/383 block? The engine will have ram horn exhaust manifolds and a tri-power intake with a Isky 280 cam, duration @.05 is 230. Or should i look into something else? Looking for the best bang for the buck...Suggestions?