big block intake ?

[dheavychevy38]

Got a question been looking at intakes for the 454 that came in a truck I scrapped. I have noticed that there are oval ports or square ports. Do I have to pull the old one to find out ? It was in a 89 gmc k3500 cab and chassis and was orignal with a q jet and all the emissons stuff.

 

[YOUNGBLOOD13]

Just look up the casting number. Its most likely oval. Or peanut port

 

[sweetk30]

That vintage might be peanut port but could be reg oval port . Pull a valve cover and run the casting no's to find out .

 

[mrk5]

If it is peanut port, Weiand makes an intake specifically for those heads. I think they are the only one. That's the one I'm running.

 

[76zimmer]

Edelbrock makes one too.

 

[nvrenuf]

Since peanut ports stop flowing just over 4k is it worth the cost of putting an aftermarket intake on it? (no offense to the OP)

 

[mrk5]

Depends how you define "worth". My reasoning was marginal weight loss and performance improvement plus I like the looks.