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Billy177 · 03-26-2005, 10:50 PM

this a 455, it had been decked and has edelbrock heads on it. this is a performer intake.

when we went to put the intake manifold on it would not bolt up. the bolt holes were off by a very small amount. is it okay just to use a dremel to enlarge the holes or does teh intake have to be machined down

Billy177 · 03-26-2005, 10:50 PM

this a 455, it had been decked and has edelbrock heads on it. this is a performer intake.

when we went to put the intake manifold on it would not bolt up. the bolt holes were off by a very small amount. is it okay just to use a dremel to enlarge the holes or does teh intake have to be machined down

66 tempest · 03-26-2005, 11:39 PM

I seen this happen, and I dont see a problem with using a dremel or a slightly larger bit to open, as long as it's a minimal clearence issue.

mikeb · 03-26-2005, 11:51 PM

Seems to be normal with the edel intakes. I just put on a performer RPM and the bolt holes had to be elongated just a bit, and the pads on top of the runners needed to be "reduced" just a bit so the valve covers would clear them. There are several posts in the archives about this so I knew to check for these issues going in. Sure enough, both were a minor problem.

Some have had to have the intake milled since their alignment issue was really bad.

Kenth · 03-27-2005, 12:57 AM

Don´t forget the long tiny bolt that pulls the intake to the timing cover, with the coolant seal between.
Intake and timing cover should have metal to metal contact before you torque the manifold to the heads.

76/80bird · 03-27-2005, 05:45 AM

Billy177, I would try the intake with out the gaskets,and see if it lines up. If it does the mill the intake the thickness of the gaskets you are using...

Skip Fix · 03-27-2005, 06:56 AM

Exactly what 76/80 said.Check the port alignment on the intake with a gasket, then to the head. If the ports and the bolt holes line up on the intake then slotting the holes will let it bolt up but the ports won;t be aligned. Most of the Edelbrocks I've used recently have had ti have 0.040-0.080 milled off to fit.

I do hope since you mentioned Edelbrock Heads that it is a Performer RPM intake.The plain Performer would reduce the flow on an E head signifigantly.

Billy177 · 03-27-2005, 08:23 AM

it actually is the regular performer. i looked up dyno charts and the performer rpm seems to make around 10-15hp mpre after around 3000rpm and the regular performer maked around10-15more below that rpm

Billy177 · 03-27-2005, 09:20 AM

if anyone notices any other issues with it, let me know. (in this picture it was npt bolted down so it is misaligned on the heads

Chris C · 03-27-2005, 11:35 AM

I had to have my intake milled the thickness of the gasket in order for it to work. The first intake was so off that I sent it back to Edlebrock. They kept it for about a month, and not only sent me a new one, but sent me 2 of them!!

Billy177 · 03-27-2005, 12:38 PM

if it does have to be milled what is the average machine shop price for doing it

PONTIAC DUDE · 03-27-2005, 12:46 PM

I would check port alignment first.

Question: Why cut an intake to make the bolt holes line up if the ports line up?

Billy177 · 03-27-2005, 12:54 PM

the port alignment looked good, i could see all the bolt holes in the head they were just off center so that they would not thread in properly

PONTIAC DUDE · 03-27-2005, 02:40 PM

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Billy177:
the port alignment looked good, i could see all the bolt holes in the head they were just off center so that they would not thread in properly </div></BLOCKQUOTE>
If the port alignment looks good, elongate the holes. Also remember that depending on the gasket, the intake will pull even lower on tightening.

Skip Fix · 03-27-2005, 04:32 PM

I'll still bet the Performer will be a "restrictor" for those heads. I did that with an HO intake on E heads for awhile.The plain Performer made more on plain iron heads. Even the ported iron head guys like the RPM better, and most of them are barely where an out of the box E head flows.You won't even notice the bottom end difference.

Billy177 · 03-27-2005, 05:22 PM

will consider the perfromer rpm then.

the current setup includes
462ci
XE274h
HS 1.5RR
E-Heads
750 performer carb
performer Intake
scat rods
forged pistons
3.08 rear end
Muncie 4spd

Skip Fix · 03-27-2005, 05:56 PM

With that cam and the heads the Performer will definitely be out of air for what the motor wants.

Billy177 · 03-27-2005, 06:01 PM

at what rpm, i don't think this thing will ever see the high side of 5000rpm

jamesgennock · 03-29-2005, 10:41 PM

Ditto performer RPM I had to grind the pads down.

Skip Fix · 03-30-2005, 06:19 AM

I'll bet if you dynoed it peak HP would be 5500-5800.There have been some posts on air flow on different manifolds. The Performer is going to drop the % of the head flow signifigantly more than the RPM on a high flowing E head.Probably down to 90% of the head flow as the cfm increases at higher lifts. Kind of like the Circle Track classes that have to run a 390 cfm carb or a restrictor plate to limit the airflow in.Torker II or an RPM have alot less loss %.

A stock or mildly ported iron head yes the difference is not as great. Jim Hand I believe has been running a RPM since he started runing ported iron heads.

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