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| Viewing Page 1 of 1 (Total Posts: 5) |
| Author | Comment |
Pat Bridge
 IP: 74.4.251.93 Mar 20, 08 - 6:50 PM |
Need to know how to make this combo work?
I am sorry for covering old ground, since I've kinda asked this before. The time has come for the shop to start putting things together for the new 258 to go into the Gremlin. I have finally located the correct header (Clifford) and would like to use that, but I have an Offenhauser 4bbl intake. I know they don't exactly get along.... Can somebody tell me EXCACTLY how to make this work? Assume that I know nothing (Not really a stretch) and need to give instructions to someone to tell them what to do. If this simply isn't a good idea, or too much trouble, does anybody have a Clifford intake they would like to swap for an Offy? Thanks for this and all the other help I have received on this forum! Pat |
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monte evans
IP: 205.188.116.10 Mar 20th, 2008 - 9:09 PM |
Re: Need to know how to make this combo work?
I done this same set-up on a 258, and I had no trouble at all, I know some of the 4bbl manifolds have a much wider edge at the corners where the bolts go, but I don't think the offy is one you have to worry about, they run really well with v-8 valves put into the head, but it takes a good machine shop guy to do it. |
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Dale fridley
IP: 71.241.237.69 Mar 20th, 2008 - 11:20 PM |
Re: Need to know how to make this combo work?
Pat; When you installed the intake and the exhaust manifolds, the only problem you may run into is the area where the washer goes over each manifold to hold it to the head.there may be a difference in the highth of the manifolds. you will see it, it will be obvious. I have seen several different solutions. the one I used was; takeing a thick walled piece of pipe, put over the bolt and ground it down on the high side till the pipe hit both maniflods at the same time, put a washer between the bolt and the pipe. Dale |
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Ron in Phx.
IP: 68.227.238.35 Mar 21st, 2008 - 12:29 AM |
Re: Need to know how to make this combo work?
I used 1/2" thick wall pipe cut in half then welded to the clifford header flange so I could bolt Offy intake and headers using thick washers and stock bolts. you may have to grind the intake to clear header in the center. |
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Gremil
IP: 72.26.17.114 Mar 28th, 2008 - 11:52 AM |
Re: Need to know how to make this combo work?
Once you get past the spacer problems bolting this combination to your cylinder head, and seems like you have, this should work fine as far as tuning it concerned. A good, properly adjusted carburetor with the timing and ignition up to par should yield a great sound with surprising power. I'm using the dual headers with the Clifford intake and it keeps me busy opening the hood to prove it really is a six. Depending on the octane gas you plan to use, set your timing for best power. I timed myself with 0-60 runs to get the best power. I bumped up the timing 2 degrees at a time until it was peak, then backed off when the 0-60 runs got slower. If you do use this method and a lower octane gas, say 89 octane, watch out for possible pinging (detonation) with a warm engine at low RPM with the throttle opened quite a bit suddenly. If this happens you can retard the timing a bit until it quits pinging or back off of the vacuum advance if it's adjustable. Of course, depending on what mufflers you use you may have trouble hearing any pinging. Properly tuned you won't be dusting off any 401 Gremlins, but those stock 304 two barrel Gremlins are going to have to get accustomed seeing your tailights moving away. You'll get better mileage than them too if using the stock cam. Have fun with it. I know I have. 
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