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Pontiac - Boost Turbo, supercharged, Nitrous, EFI & other Power Adders discussed here. |
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#1
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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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LIFT HEAVY, LIFE IS TOO SHORT TO BE SMALL! |
#2
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With a blower, one would want low cr, so the bigger chamber is better.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#3
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Agreed, especially with the big cubic inches.
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Whitmore 462, 670 heads 10.55@125 Same with 310 E D-ports 10.12@131 498 w/single 88 8.53@158 |
#4
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Thanks guy. Now I just need about, 10,000 hours of overtime!😀
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LIFT HEAVY, LIFE IS TOO SHORT TO BE SMALL! |
#5
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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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1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
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#6
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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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LIFT HEAVY, LIFE IS TOO SHORT TO BE SMALL! |
#7
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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. GT |
#8
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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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My Half AN Injun..... |
#9
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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. GT |
#10
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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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#11
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which vendors are offering that chamber enlargement?
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1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
#12
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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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