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| Machining Offy Intake for additional HP ?? https://www.slantsix.org/forum/viewtopic.php?t=36844 |
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| Author: | Slanteast [ Mon Aug 24, 2009 11:32 am ] |
| Post subject: | Machining Offy Intake for additional HP ?? |
Just wondering if anyone had any input on machining away the spreadbore in an Offy intake? when my engine was dynoed on pump gas (street / strip build) my engine builder was trying a couple of carb spacers under the 500 Edlebrock, when it didn't pick up with the spread bore spacer he said if it didnt like that it probably doesn't like any. He said that if he cut out the center and rounded the sharp edges it should pick up 1 to 3 hp? Has anyone tried this with good or bad results, or could recommend any modifacations that may help? Thanks Derek |
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| Author: | Dolmetsch [ Sun Aug 30, 2009 11:56 am ] |
| Post subject: | Maching offy intake for more power |
http://seniordragster.bravehost.com/mycar.html (Very bottom of the page) I turned mine sideways and ground the sharpe edges smooth. I also ported the intake at head side to just under gasket size. (this allows for good flow even in the event of a slight msmatch) The difference turning the carb sideways makes is unbelievable although I doubt it WOT power would be different. Idle and low speed though is darn near perfect. This is also an Eddy carb although you may detect some of my handywork . Don |
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| Author: | Joshie225 [ Sun Aug 30, 2009 9:11 pm ] |
| Post subject: | |
The Offy manifold does not accept a spread-bore carb. The 4-hole adapter on the manifold is to fit AFB types and Holleys to the old Rochester pattern on the manifold itself. I put a Holley 390 on my Offy manifold with the primaries towards the outside by using the adapter from my Clifford manifold. You can rework the Offy adapter so it can be turned 90°, but the Clifford adapter was already on hand. BTW, Don, I like your road test write up! |
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| Author: | Slanteast [ Mon Aug 31, 2009 9:46 am ] |
| Post subject: | |
Thanks for the imput guys, I was calling it a spreadbore ( four equal holes) because that is what I thought it was called.  I thought the engine builder was wanting to remove the center and then radius the sharp edges to pick up power. Does anybody have the linkage issues resolved with a sideways mounted edlebrock in an A body ( 70 Duster) with a four speed.Thanks again Derek |
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| Author: | 66aCUDA [ Tue Sep 01, 2009 6:11 am ] |
| Post subject: | |
Derek I have a 73 Duster with Offy and Eddy mounted side ways. It wasnt any real challenge to build a bracket for the cable type gas pedal. Since mine is a Race Only car i dont have to worry about a kickdown as mine is tied back. Frank |
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| Author: | Doc [ Tue Sep 01, 2009 9:58 am ] |
| Post subject: | |
Seeing it's a 4-speed, you have it easy... no kickdown linkage to mess with. Get a long throttle cable out of a 2.2 (transverse engine) Mopar and swap that in, then make a bracket and spring holder... Done. DD |
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| Author: | Slanteast [ Wed Sep 02, 2009 5:38 am ] |
| Post subject: | |
Thanks for the tips everyone...that dragster is top shelf cool!! Derek |
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