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Old 09-05-2024, 09:49 AM
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Default Head Ccs

If building a roots blower motor from scratch, would you start with 72 or 87 ccs, or does it matter? Would be a pump gas 535, looking to build 900+ hp.
Thanks

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Old 09-05-2024, 10:54 AM
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With a blower, one would want low cr, so the bigger chamber is better.



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Old 09-05-2024, 12:31 PM
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Quote:
Originally Posted by johnta1 View Post
With a blower, one would want low cr, so the bigger chamber is better.


Agreed, especially with the big cubic inches.

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Old 09-05-2024, 05:56 PM
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Thanks guy. Now I just need about, 10,000 hours of overtime!😀

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Old 09-05-2024, 06:13 PM
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i think 72cc e heads flow more then 87 cc e heads for example. if theyre ported its still a consideration. if you havent ordered pistons or heads you have options. especially w a 535 youre going to need dished piston with either size head.
i am building a pump gas 505 to eventually turbo on e85 and race gas. i have 87cc e heads and about 10:1 or hopefully slightly less with the piston a skosh in the hole.
my friends ls stuff is turboed on e85 in the high 12-13:1 compression

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Old 09-05-2024, 07:35 PM
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I have wide ports right now, I don’t want to build a custom intake, and want to get away from the offset roller lifters.

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Old 09-05-2024, 10:14 PM
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I went with a 400+60 and big cc-455 heads Comp is 7:89"1
It's pump gas friendly and made around 600-hp with a small
flat-tappet cam that Scott Brown profiled for me, very simualar
to a RAIV cam with a 8-71 blower, very street able and
pump gas 3"42 gear and a tight converter from butler.

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Old 09-06-2024, 04:11 AM
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Under 9:1 is best . I prefer the smaller chamber with dish tops to get it there ... Being its a lager cubic inch it might be a challenge thou.. I have 8:4 and its nice an easy to tune.. The higher you go the smaller the tuning window..

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Old 09-06-2024, 10:24 PM
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I upgraded the camshaft now I just have to get the car finished that
this blower motor is for. I'm also waiting on a adapter to put on a
wenzler intake (shorten of coarse) seen it done on engine masters
with a big block chevy and made a 100HP more with back-back runs.
I figure with both upgrades hope to see 700HP possibly.

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Old 10-03-2024, 05:15 PM
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You could have them machined on a cnc to the big chamber mod like some vendors are offering .. 94/95 cc from the old 72cc chamber.

Kris.

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Old 10-07-2024, 08:21 AM
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which vendors are offering that chamber enlargement?

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Old 10-07-2024, 03:53 PM
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Quote:
Originally Posted by mysticmissle View Post
which vendors are offering that chamber enlargement?
use to be sd perf, i had my 72cc eheads done by him with his blower chambers, 96cc. not sure who else does it. gonna run them on a 505 turbo build

i have another set of round port old chamber 72ss i want to do the same with but also go with wide ports

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