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Intake manifold identification

terry2terry2Member
Help! My '71 Pantera has a 750 CFM Holley (too much capacity for a stock engine in Denver) with inoperative secondaries. The carb (3310-3) is a square bore design, but upon removal I found the manifold is a spread bore - with a carb spacer that has holes about 20 percent smaller than the secondaries! Found a 650 CFM spreadbore Holley (80551-1) that is supposed to replace the stock carb, but the carb venturis don't line up (not even close) with the manifold bores. My intake casting number is D1ZE9425BB; other numbers readily apparent on the intake are IE4 and 13728648. An hour spent with my friend Google didn't help identify the manifold, allthough I did find Dan Jones's intake manifold information on a Mustang site, but my casting number is slightly different. What intake manifold do I have?

I want to end up with a Holley 650, vacuum secondaries and my stock intake manifold...any ideas or advice? I'll call Ford in the morning - but sometimes you folks have already threaded the needle!
Thanks,

Terry Marsh #2207
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bosswrenchbosswrenchMember
You didn't mention it, but if the intake is iron, you have a stock spreadbore intake- casting #s varied a little. As you found, a square-pattern Holley doesn't fit well on spread-bore intakes. I suggest an aluminum Edelbrock Performer intake; it bolts on, fits both carbs and will run better with slightly more power & no drawbacks. If the engine is intended to be radically modified, other intakes might be considered.
bosswrenchbosswrenchMember
No many spreadbores around any more- the few Holley spreadbores made are tightlky restricted emissions carbs that are close to impossible to adjust or tune. Rochester (GM) spreadbores are all out of production since the mid-80s due to GM going exclusively to EFI. I advise abandoning your iron intake for a lighter more modern manifold drilled for a square-pattern carb. Since you're shopping, perhaps the popular Edelbrock Performer intake and their matching Edelbrock carb would be to your liking, to which they bought the mfgr rights a decade ago from Carter Carburetor. Be aware that tuning such a carb is totally different than with a square-pattern Holley & being out of the mainstream (Holley), you'll likely get little tuning advice thats useable.
terry2terry2Member
Thanks for sharing your wealth of experience Jack. After a lot of research, I arrived at the same conclusion. The spread-bore intake has to go, and I'll use a Performer intake with a Holley 600 cfm vacuum secondary carb with an electric choke.

The other lesson learned during this project? Remove the engine deck lid; it is easy to do, and your lower back will thank you for a long time! Too bad I didn't figure that out before crawling in/out, in/out, in/out (ad nauseum) for a few days.

Terry Marsh
#2207
Views: 387
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