[Billy177]

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

[Kenth]

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.

[66 tempest]

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.

[Billy177]

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

[76/80bird]

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...

[PONTIAC DUDE]

I would check port alignment first.

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

[jamesgennock]

Ditto performer RPM I had to grind the pads down.

[Skip Fix]

SHould be not proble, on hood clearance . A friend has one on his 71 GP hidden under the factory air cleaner and painted to match the motor.

[Chris C]

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!!

[Skip Fix]

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]

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

[73ta]

I had to take 0.060" of of my Performer RPM to get the ports to match. Not only cost me $160, but took forever to find a machine shop with the capability to do it. This is mounted on a stock height block with new Edelbrock heads. You would think Edelbrock would be able to make a better match than this with their heads.

[Billy177]

allright, and the final; question will a performer rpm clear the hood of a 1970 gto

[PONTIAC DUDE]

<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.

[Billy177]

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

[Billy177]

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

[GoatDr]

Yes, it will clear. Even the Torker2 clears with a spacer on my 70 goats.

[form406]

id measure the height of the rpm and double check...wouldnt clear my formula hood...

[Billy177]

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]

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