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Old 01-31-2014, 09:34 AM   #1
ratrodney
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Talking best blower or turbo engine to build?

If i was to build a from the block up 500ci er...would a 76 caddy 500 be ok? I figure it already has the lower comp setup so with new forged pistons,,,,cam,,,bearings,,,rebuild hi po heads to run a blower with 6-8lbs of boost or twin turbos with medium boost.
Lookin for reliable wow factor setup with 500+ horses n 550+ ft lbs of tourque. Tnx, RR
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Old 02-02-2014, 08:48 AM   #2
~JM~
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Quote:
Originally Posted by ratrodney View Post
If i was to build a from the block up 500ci er...would a 76 caddy 500 be ok? I figure it already has the lower comp setup so with new forged pistons,,,,cam,,,bearings,,,rebuild hi po heads to run a blower with 6-8lbs of boost or twin turbos with medium boost.
Lookin for reliable wow factor setup with 500+ horses n 550+ ft lbs of tourque. Tnx, RR
Ultimately you want a later block like the '76 that you mentioned as they have improved oiling passages. Then you want to use the early model closed chamber heads, as they have a better combustion chamber shape, breathe slightly better & have a bit more porting potential. Now you will need a deep dish or reverse dome pistons. That is where you might have a problem. I don't recall what type of off the shelf pistons are available for this combination. You should probably call MTS & discuss your plans as they have built a few blown engines.

You don't need any type of forced induction to reach your stated HP & torque goals. Five hundred HP can be reliably had in a naturally aspirated form. Again... Call MTS to discuss your project goals & they'll help you to develop a plan of attack.

Good luck
~JM~
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Old 02-03-2014, 07:47 AM   #3
Nashalac
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The advantage of the 120cc heads is lower compression with flat top pistons. With forced induction head flow is not as important. We have forged flat top pistons in 4.350" on the shelf for 9 to 1. Keep the boost at 5 lbs and you will make plenty of HP and tq

With the early heads you can make a bit more power but custom pistons would be required
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Old 04-29-2015, 11:29 PM   #4
Ludde
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What is the actual difference in oil passage between the early block and later?
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Old 06-06-2015, 08:28 AM   #5
Bruce
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The earlier blocks had 5/8" oil galleys that were later enlarged to 3/4". I believe those are the dimensions, but I wouldn't swear to it. I am running on of the earlier blocks with the smaller oil galleys. I haven't had any problems with oiling, just a few blown headgaskets and stretched blower studs when it got too lean.
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