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Old 03-03-2012, 12:43 AM
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Getting more power from my stock pontiac 400

I got a 76 transam I just got it going again I bought it awhile back it was stored in a barn. I just recently put a ram air system on it the car is automatic I know theres a lot that can be done but I don't know where to start. Any suggestions that I can do?
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Old 03-03-2012, 12:00 PM
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Quote:
Originally Posted by iparra76
I got a 76 transam I just got it going again I bought it awhile back it was stored in a barn. I just recently put a ram air system on it the car is automatic I know theres a lot that can be done but I don't know where to start. Any suggestions that I can do?
If you're looking for more power, be careful. In early 1975 (mid year '75 casting) 400 Pontiac blocks were cast with thinner main webbing and These blocks all had the 500557 casting number. The main webbing was prone to cracking/breaking with higher RPM and/or horsepower usage. The block casting number can be found on the lip of the block behind and below the passenger side head.

Bill

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Old 03-03-2012, 04:50 PM
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Quote:
Originally Posted by iparra76
I got a 76 transam I just got it going again I bought it awhile back it was stored in a barn. I just recently put a ram air system on it the car is automatic I know theres a lot that can be done but I don't know where to start. Any suggestions that I can do?
Run the numbers to be sure of the engine displacement- it could easily be a 350, 400 or 455 and could even be other displacement Pontiac engines, but less likely. There were even Olds 403s installed '77-'79.

Depending on what heads are on it (they also need to be checked, the number is on the center exhaust ports). Head codes and secondary identifier info HERE. Just be aware the chambers need to be CC'd to know for sure what the volume is, don't rely on ANY published figures.

You can benefit from headers and dual exhaust, rear gears, and a mild cam. Unless you're going to cam this engine up pretty good, the stock intake will work fine- but it is heavy. I'd keep the Q-jet, too.

There are quite a few threads here at Hotrodders, you can use the search to find them. Some Pontiac sites HERE.
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Old 03-04-2012, 11:36 AM
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First things first. Get "educated" in the ol' Injun.

Jim Hand's "How to Build Max-performance Pontiac V8s", published by SA Designs. This is the most current study of the Pontiac engine. In it are the "history", dispelling many myths about the engine, how to approach a durable shortblock, good "home" porting information, trends in camming, manifolding, etc., and an excellent chapter on the Q-Jet. Some of the info is a bit dated now (2004) but overall it's still very good. Once you've read this book, get back to us!

Jim
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Old 03-04-2012, 11:42 AM
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Correct me here, but are you not 'Jim Hand'?

Anyway, another book you might learn something from is How to Rebuild Pontiac V-8s (Workbench) by Rocky Rotella
http://www.amazon.com/How-Rebuild-Po...0886588&sr=1-1
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Old 03-04-2012, 10:50 PM
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No I'm not Jim Hand haha

And thanks guys ill look at the numbers before I do anything I want to make sure the motor can handle the power.
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Old 03-05-2012, 07:02 AM
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Nope, not Jim Hand. Jim is a retired phone company worker from Kansas City area. He raced his wagon for many years, collecting every "scrap" of data, and used that as a basis for his findings.

I am Jim Lehart. I'm an ASE "Past Master" engine builder with about 35 years "in the business". I wrote chapter 2 "Building Your Shortblock" in Jim's book.

I've only seen exerpts from Rocky's book. It appears to be a "step by step" assembly manual for the uninitiated. There are rumors that he's working on an "update" to Jim's book. However, only one or two of the "original players" have been contacted about the updates, so it's value has yet to be determined. There's been a "polarizing rift" in the Pontiac "world" since the book was first published. NONE of these books are "aimed" at racers, but street performance.

Jim
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