The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

BigBlocksRule · 12-28-2008, 11:12 AM

Buy it, sell it and buy the correct one for your heads. Pull a valve cover and get the 6 or 7 digit casting number and post it back here. I'm betting the casting numbers end in 236 which is peanut ports. The Edelbrock Performer intake will fit those. If you have 781 or 049 castings, the Performer RPM or air gap will work. I wouldn't even try the big square port intake on smaller heads for the above mentioned reasons. It's actually worth more than the small port intakes, you should be able to sell it for enough to buy the correct one.

12-28-2008, 11:12 AM	#9
BigBlocksRule Registered User Join Date: Jun 2008 Location: Lubbock, TX Posts: 2,047	Re: 1986 454, Square or Oval Port Head? Buy it, sell it and buy the correct one for your heads. Pull a valve cover and get the 6 or 7 digit casting number and post it back here. I'm betting the casting numbers end in 236 which is peanut ports. The Edelbrock Performer intake will fit those. If you have 781 or 049 castings, the Performer RPM or air gap will work. I wouldn't even try the big square port intake on smaller heads for the above mentioned reasons. It's actually worth more than the small port intakes, you should be able to sell it for enough to buy the correct one.