Older heads, newer intake manifold, Modifcations??
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Senior Member
Joined: Sep 2004
Posts: 502
Likes: 1
From: Leesville, LA
Car: 1989 Camaro RS
Engine: Modified 350 TPI
Transmission: Modified 700 R4
Axle/Gears: Posi 3.42
Older heads, newer intake manifold, Modifcations??
Ok, so I have a few threads open but here goes another. I purchased world products heads BUT they are for '87 and older. I have a speed density setup that I want to run. Does anyone have info or PICS on the bolt hole modification? I've heard that they don't quite match due to different angles. Thanks-
Supreme Member
Joined: Aug 2003
Posts: 1,644
Likes: 4
From: Long Island New York
Car: 89 Formula 350
Engine: Forged 385 H/C/I
Transmission: 700R4-4300 Stall-lockup
Axle/Gears: BW 9 Bolt 3:70
you can get an Edelbrock TPI intake base. PN#3860. Has a duel bolt pattern for center bolt and after market heads. It will work on all non vortec heads. If you were planning on modifying the stock base,I wouldn't bother it's very restrictive.
Joined: Apr 2004
Posts: 3,180
Likes: 3
From: Browns Town
Car: 86 Monte SS (730,$8D,G3,AP,4K,S_V4)
Engine: 406 Hyd Roller 236/242
Transmission: 700R4 HomeBrew, 2.4K stall
Axle/Gears: 3:73 Posi, 7.5 Soon to break
Got you a pic
Its not hard to open them up.
It only needs a little bit of an oval to make them work. Doing an angled oval is the best way to do it without removing a ton of material. The bolts almost start but are at a slight angle to the heads. (72 degrees Vs 90 IIRC)
I used a "roto-zip" tool bit in my dremel, cut it very quickly and smooth.
Might want to do some flattening of the top of the manifold so the bolt heads sit flatter when your done. The both heads will sit tilted and won't have the full contact beneath them.
I only did a small amount and never had a problem with them.
It only needs a little bit of an oval to make them work. Doing an angled oval is the best way to do it without removing a ton of material. The bolts almost start but are at a slight angle to the heads. (72 degrees Vs 90 IIRC)
I used a "roto-zip" tool bit in my dremel, cut it very quickly and smooth.
Might want to do some flattening of the top of the manifold so the bolt heads sit flatter when your done. The both heads will sit tilted and won't have the full contact beneath them.
I only did a small amount and never had a problem with them.
Joined: Apr 2004
Posts: 3,180
Likes: 3
From: Browns Town
Car: 86 Monte SS (730,$8D,G3,AP,4K,S_V4)
Engine: 406 Hyd Roller 236/242
Transmission: 700R4 HomeBrew, 2.4K stall
Axle/Gears: 3:73 Posi, 7.5 Soon to break
From the top
Another view from the top.
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