Bbc cast iron intake questions

jatmobkar · 12-23-2014, 01:54 PM

I'm not class racing I'm just trying to go fast with stock parts. I have a 427/390 up intake on my 454. Has anyone modified the plenum to look like an aftermarket intake? Also would like info on carb spacers with a stock intake. I already had a dean oliver quadrajet and the car runs great I'm just looking to go faster. Thanks

Terry Cain · 12-23-2014, 07:37 PM

You don't say what type of car but, if it's not a corvette (hood clearance) get an after market intake. I run the 427/390 Corvette manifold (aluminum) because I have to and it is a piece of junk.

jatmobkar · 12-23-2014, 08:12 PM

I didn't know the stock stuff was that bad. How would it compare to a performer if the plenum was modified.

Terry Cain · 12-25-2014, 01:56 PM

Haven't run an aftermarket on this car but usually they're good for 20 hp.

Alan Roehrich · 12-25-2014, 03:34 PM

Don't hack on the stock manifold, it just isn't worth the time or effort. Besides, hacking on the plenum could result in horrific mixture distribution problems, that could result in engine damage.

Just get the Edelbrock 7164 or 7561, and be done with it, you'll be time and money ahead.

We're not allowed to run spacers on stock intakes, so I doubt you'll see any data here for that either. But if you just bolt on one of the Edelbrock intakes, it won't matter, you won't need a spacer.

jatmobkar · 12-25-2014, 08:22 PM

Thank you guys. I appreciate the help

Glenn Briglio · 12-26-2014, 12:16 AM

Edelbrock performer rpm and performer rpm air gap are good manifolds to use over cast iron oem manifolds. Putting a 4 hole spacer on top of them will also help if you have the room. If you have to use the oem manifold it can be modified to work better than stock.

jatmobkar · 12-26-2014, 09:06 AM

Well that's what I'm wondering. What's the way to improve a stock manifold. Cliff Ruggles swears by the stock Pontiac manifolds. I know it might be apples to oranges but they can't be that different. I see the Pontiac guys grinding on the cast iron a lot.

12-23-2014, 01:54 PM	#1
jatmobkar Junior Member Join Date: Sep 2011 Posts: 10 Likes: 0 Liked 0 Times in 0 Posts	Bbc cast iron intake questions I'm not class racing I'm just trying to go fast with stock parts. I have a 427/390 up intake on my 454. Has anyone modified the plenum to look like an aftermarket intake? Also would like info on carb spacers with a stock intake. I already had a dean oliver quadrajet and the car runs great I'm just looking to go faster. Thanks

12-23-2014, 07:37 PM	#2
Terry Cain Senior Member Join Date: Feb 2008 Location: Georgetown, Indiana (close to Louisville, KY) Posts: 778 Likes: 530 Liked 231 Times in 107 Posts	Re: Bbc cast iron intake questions You don't say what type of car but, if it's not a corvette (hood clearance) get an after market intake. I run the 427/390 Corvette manifold (aluminum) because I have to and it is a piece of junk. __________________ Terry Cain ???? STK tcain19689585@gmail.com

12-23-2014, 08:12 PM	#3
jatmobkar Junior Member Join Date: Sep 2011 Posts: 10 Likes: 0 Liked 0 Times in 0 Posts	Re: Bbc cast iron intake questions I didn't know the stock stuff was that bad. How would it compare to a performer if the plenum was modified.

12-25-2014, 01:56 PM	#4
Terry Cain Senior Member Join Date: Feb 2008 Location: Georgetown, Indiana (close to Louisville, KY) Posts: 778 Likes: 530 Liked 231 Times in 107 Posts	Re: Bbc cast iron intake questions Haven't run an aftermarket on this car but usually they're good for 20 hp. __________________ Terry Cain ???? STK tcain19689585@gmail.com

12-25-2014, 03:34 PM	#5
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,119 Likes: 1,578 Liked 1,847 Times in 418 Posts	Re: Bbc cast iron intake questions Don't hack on the stock manifold, it just isn't worth the time or effort. Besides, hacking on the plenum could result in horrific mixture distribution problems, that could result in engine damage. Just get the Edelbrock 7164 or 7561, and be done with it, you'll be time and money ahead. We're not allowed to run spacers on stock intakes, so I doubt you'll see any data here for that either. But if you just bolt on one of the Edelbrock intakes, it won't matter, you won't need a spacer. __________________ Alan Roehrich 212A G/S

12-25-2014, 08:22 PM	#6
jatmobkar Junior Member Join Date: Sep 2011 Posts: 10 Likes: 0 Liked 0 Times in 0 Posts	Re: Bbc cast iron intake questions Thank you guys. I appreciate the help

12-26-2014, 12:16 AM	#7
Glenn Briglio VIP Member Join Date: Nov 2002 Location: Massapequa Park,NY Posts: 1,285 Likes: 1,905 Liked 974 Times in 310 Posts	Re: Bbc cast iron intake questions Edelbrock performer rpm and performer rpm air gap are good manifolds to use over cast iron oem manifolds. Putting a 4 hole spacer on top of them will also help if you have the room. If you have to use the oem manifold it can be modified to work better than stock. __________________ 1989 Camaro Iroc-Z I/SA B&B Auto Machine Shop.

12-26-2014, 09:06 AM	#8
jatmobkar Junior Member Join Date: Sep 2011 Posts: 10 Likes: 0 Liked 0 Times in 0 Posts	Re: Bbc cast iron intake questions Well that's what I'm wondering. What's the way to improve a stock manifold. Cliff Ruggles swears by the stock Pontiac manifolds. I know it might be apples to oranges but they can't be that different. I see the Pontiac guys grinding on the cast iron a lot.