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Old 06-20-2003, 04:32 PM
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Drive to the Upholstery Shop

Well, it finally stoped raining long enough for me to get my PU to the trim shop. I have been solving oil pressure problems (new sending unit fell on its face), got the 2 1/2 inch exhaust pipe on to replace the 2 inch butcher job. The first Yaahoo not only screwd up the exhaust system, he cross threaded the new O2 sensor at the tune of $59. But did the extra half inch bring the motor to life!! Every young guy should get to drive a choked down motor and then try it when it is opened up to breathe!! The truck drove like a dream and the motor purred like a lion and I never obtained more than 1/3rd throttle. The EFI will be tuned a bunch on the return trip. Right now, it does not like 2100 RPM and moderate load in 4th gear overdrive!! 39 degrees total timing is a little much with 10.2-1 compression.

Trees
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Old 06-20-2003, 06:48 PM
4 Jaw Chuck's Avatar
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Pics...more pics...please!

Sounds great!
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Outlawed tunes from outlawed pipes
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Old 06-20-2003, 06:58 PM
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Have a few in the new Cam, Just got to get them down loaded. I'm trying to load up some oldies for the Senior Citizens of the board: should be up in the next few minutes

Trees
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Old 06-20-2003, 09:21 PM
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Hello Trees.
I was reading what you said about going from two -two and a half inch exhaust. It made quite a difference huh?
Now here is my question to you. Did you have manifolds with 2.5" outlets already and they were reduced to 2" pipe or what?
The reason I am asking is because I have 2" outlet manifolds (ramhorns) on my 327. I have been in search of some 2.5" ramhorns but have not been too lucky yet. I am wondering if I can just step up my exhaust pipe size to 2.5" and see some increase in performance or is it too late once the exhaust has already been squeezed through those 2" manifolds?
I really do not want to go with the "block hugger" style headers for my 55 Chevy truck.
Maybe I should mention this is on a 327 with 462 heads comp xe 274 cam. edelbrock performer intake,750 Holley and Hei.
Thanks for any help on this one.....
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Old 06-21-2003, 07:13 AM
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Coleman, I have the 2.5" dumps and they were choked down. I also have the same setup on a 327 as you in a 36 Ford coupe. It has the Vette heads, a GM competition dual plane high rise, and the Crane regrind of the 300HP Vette cam but is improved because of the dual pattern. I have the PU 2" Rams horn exhaust because of clearance problems. It runs fine, but 2 1/2" would improve it. Scoggins Dickey, a GM Competition Parts dealer sells new 2 1/2" rams horn Corvette manifolds and are very reasonable (scogginsdickey.com). You can go the Cast Sanderson Headers which are better but EXPENSIVE. I will put these on my 327 down the road because they are much tighter fitting.

Trees
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