Author Topic: Hypothetical intake question?  (Read 3517 times)

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BarryB

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Hypothetical intake question?
« on: July 20, 2011, 11:58:13 PM »
I just picked up my 427 (4.25") stroker kit. I've got the JE 242930 pistons which are just a shade over 10-1 compression.
My thought is a max ported P.I. intake with an old school Holley 3255 carb of 850 CFM with Lemans bowls. I want it to look period for a late '60's Mustang. How would this fare with a big solid cam, 292S or maybe a bit bigger?
I'm thinking of sending my intake to Joe Craine for a full porting job (providing he will do it for me).
I like this intake because, A) I have one.  B) It will work with factory shaker setups because of the factory location and  C) It looks stock with the factory p/n on it.
I will probably have my RPM heads lightly rubbed on a bit too.

Not sure if Werby is on here but a HP/TQ prediction would be cool!
1968 428CJ Mustang fastback

jayb

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Re: Hypothetical intake question?
« Reply #1 on: July 21, 2011, 09:22:17 AM »
I think you would be under-intaked and maybe under-carbed with that setup, but no doubt it will make some power.  FYI on the first go around with my 492" engine back in 2005 it used a Blue Thunder intake, 850 cfm Holley carb, street/strip ported Edelbrock heads, and a 306S solid cam, and only made about 540 horsepower.  Made gobs of torque, though.   Here's a chart of the dyno results:



When you get into that kind of cubic inches, if horsepower is your goal you need to think about a roller cam and a Victor/Dominator combination.  Even if you really work over that PI intake it won't fare much better than the Blue Thunder intake, at least based on the test results I got from my book.  Also, the 294S cam is way too small for a big 427 stroker.  If you want to maintain the period correct look, I'd be at least thinking about upgrading to a roller cam; that will get you back 30-40 horsepower.

I went back to the dyno with the 492" engine later with the same heads, a big roller cam, Victor intake and 1150 Dominator carb, and it made well over 600 horsepower.
Jay Brown
- 1969 Mach 1, Drag Week 2005 Winner NA/BB, 511" FE (10.60s @ 129); Drag Week 2007 Runner-Up PA/BB, 490" Supercharged FE (9.35 @ 151)
- 1964 Ford Galaxie, Drag Week 2009 Winner Modified NA (9.50s @ 143), 585" SOHC
- 1969 Shelby Clone, Drag Week 2015 Winner Modified NA (Average 8.98 @ 149), 585" SOHC

   

BarryB

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Re: Hypothetical intake question?
« Reply #2 on: July 21, 2011, 10:39:46 PM »
Thanks Jay, I'm not really out to put up a big number I just don't want to choke it off.
My (further) thoughts are a set of Hooker super-comps, maybe a bit bigger cam like the 306S and have it all done at 6500 RPM tops, I'll probably want to shift (Toploader) at 6000 to make sure it lives.
This is to be in a yet undefined street-strip car. Maverick or maybe a '66-69 Falcon.
Something of that nature would be light enough to not hurt too many parts and should still run in the 10's.
1968 428CJ Mustang fastback