Today I was told that a fuel injection manifold will not properly bolt to a carbureted engine's heads. Was told the angle of the heads is different. This guy told me that the manifold will bolt on, but will wear the distributor gear and cause vacuum leaks. Any thoughts...I have nothing but doubts about what he told me.

 

Bzzzt...he gave you misinformation.

 

He might be thinking of bolting an '87-up TPI intake on to '86-earlier heads (the old centerbolt vs. perimeter bolt problem). But, you could bolt a TPI onto the early heads if you found a base off a TPI Vette or '85-'86 TPI F-body.

 

False. The will readily accept them, especially after a massage and some some paper and junk out of a tube. Then they both get excited and, uh... *cough*...'intertwine' so to speak.

 

1) The 87+ intakes have different bolt angle on the center 4 bolts.

2) 87+ motors with OEM roller camshafts, require a special dizzy gear. Mixing and matching will result in wearing of the
gear or camshaft.

The mechanic prolly knows what he's talking about. You may have misinterpreted what he said.

-- Joe

 

No, no misintrepretation. I'm very familiar with the TPI manifold changes throughout the years. I even did my research about the distributor gear before starting the engine. Street and Performance told me that you can use a distributor from a roller engine (87+) in a non-roller engine, but you can't go the other way.

Very specifically, he said that the "carbureted heads" will not accept a fuel injection manifold. The result would be vacuum leaks and distributor gear wear. He told me the angle on the heads (not the bolt pattern) was different.

 

 

So let me ask this... Would the 416 casting be considered a carbed head since it was designed and originally used on the LG4 and L69?

Seems reasonable to say that. But then GM decided to use it on the 305 TPI engines on 85 and 86. So would that make it a carbed cylinder head, or fuel injection cylinder head?

I don't know or understand why the mechanic told you that.

Regardless, there are no "carbed cylinder heads" or "fuel injection cylinder heads". GM does not make a distinction between them, why would anyone else?

 

Was he trying to sell you some 'fuel injection' heads?

 

Thats not true, GM has never changed that angle.

 

i guess my world products sportsman 2 heads are fuel injected versions then.

 

No, them are special Nitrous heads!