I have a 71 Blazer with a mild carbed 355 that I'm going to put a 91 TPI setup on. I did a search and found out that I need to slot the 4 center intake bolt holes. Whats the best way to do this? Anyone have pictures? Also, I heard that angled washers are availible for this, where can I get these? Thanks.

 

dang your in luck i just did this, well I called machine shops are here are and tampa and noone wanted to do it, so I had to do it myself, with help from my friend dad at least well check it out, edelbrock has this drill slotting tool, its part number edelbrock 8501 it's bascially a drill guide but this is going to set you back about 60-70 dollars from summit you might be able to find it cheaper from a local speed shop, and get it faster too. Cause summit has it one back order right now. Now the adaptors are a weiand/holley prt number 90748 now this will set you back about 50 bucks. Well thats pretty much what you'll need to do your project, cause I doing it for my holley stealth ram set up.

 

Thanks a lot for the info, thats just what I needed. Do you think this eldebrock tool would be on ebay? Seventy bucks is a little much for a tool I'm only going to use a few times

 

oh and I'll try to post some pics as soon as I get my girlfriends camera, and get somewhere to up load it too. Oh and on the spacer/adaptors, the reason I put weiand/holley cause it's a weiand part but summit has it under a holley part, same company but that kinda of threw me off when I was tring to find it. Well good luck.

 

well try to call around to a machine shop, cause they might have the tool and charge you like 20-40 dollars, to do it. You might have more luck up there then I did down here. I found one guy, but he was behind building race motors, I would try that first. But ebay might have it, but might not. I think someone said that holley may have a tool like that too. If they do, it might be cheaper.Man its a real simple tool that's what really sucks about it, Well if your really steady with a drill or diegrinder you could attempt it without the tool, I don't trust myself without it though.

 

I used a router with a 7/16 end milling bit I borrowed from a machinist at work. Clamp the base of the router to the bottom of the intake flange and line the bit up about half a hole towards the center. Lower the bit through the flange and you will have the right angle for mounting. Also, if you have access to a McMaster Carr catalog, you can order a pack of 10 square aluminum angle washers called beam washers. They are about 1/4" on 1 side and about 1/16" on the other side. Makes the bolt heads fit almost flush. If you need, Iwill look up the part number and post for all. If I remember right, there about $.50 each.

 

I'd do it for ya, but I think the time and shipping involved, not to mention I really dont need to be deluged with requests nor do I have the time to be makes it not such a great idea. I know you can just use a drill to elongate the hole, with time spent to mark the area and checking your progress every once in a while you can make a pretty nice hole. Not exactly the way a drill bit is supposed to be used, but what the heck. Then you need a flat spot for the bolt and you can forget about the angled washer idea. I have a theory that with one of those cylinder shaped stone cutters and some patience you could grind a nice flat spot into the aluminum for the bolt head. Thats the DIY method I envision anyway. Theres metal cylinder shaped cutters that would last much longer than those stones do (and make a better surface) but those are harder to find and a bit more costly.

With a mill its simple. Mount manifold, drill, spot face. Flip manifold around, repeat. Too bad they cost so much, otherwise we'd all have one, right?

 

I ended up getting the manifold tool, but the angled washers from Holley are on backorder until sometime in the next ice age. 72LT1VETTE, if you can get me a part # on those washers, I would apreciate it greatly.

 

I'll get the number tomorrow and send tomorrow night.

 

Hey TPI 5, haven't forgot about the washer part #'s. Left my book at a jobsite in North Ga. Will be going back there Monday. Should have a number for you then.I apologize for the delay.

 

Yes, http://www.mcmaster.com/ has them. They call them "square beveled washer" if you want to do a search for them.
They are available in all types of metal and sizes.

72LT1, are you sure the ones you got were aluminum? The aluminum ones are not available with the thick side 1/4" only available in 7/16" on the thick side.

 

TPI 5....tHE McMASTER CARR PART # IS 92810A120. COMES IN PACK OF 5 FOR $2.47 PLUS FREIGHT. THEY ARE NOT A THICK AS ADVERTISED. THEY HAVE MANY SHIPPING LOCATIONS, POSSIBLY 1 NEAR YOU FOR WILL CALL PICKUP.
GOOD LUCK

 

Thanks for the info, now I can get started on the swap