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#1
08-04-2003, 03:07 AM
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tips for a 400
Hey I was wondering if anyone could help me I am just about to put a 400 in to my car now and im wondering what are some cheap tips to boost horsepower?
any help with greatly be appreciated 
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#4
08-04-2003, 11:27 PM
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The amount of parts available for american V8's are endless. The best thing to do would be to slap on a exhaust system and maybe even some headers. If you want to get advanced you can port and polish the heads add a cam or even throw ssome nitrous on that beast. Good Luck
__________________
You can make any piece of sh*t fast but then all you have is a fast piece of sh*t.......
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#5
08-05-2003, 12:48 AM
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Quote:
__________________
My Stable: 2002 Yamaha YZF-R6 1988 Pontiac Fiero 1969 Pontiac Firebird I might get my '02 SS back....
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#6
08-05-2003, 01:55 AM
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as far as i know the heads are stock 77 400 heads and I'm pretty sure that means that they have an either 96cc or 101cc combustion chamber.
I wasnt planing on puttin a big carb on anyway i was thinking of a 650 vacum secondary for now untill I put a bit more work into it.
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#7
08-05-2003, 02:55 AM
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Good choice, it's very easy to over carb Pontiacs. You could have the block decked to gain some compression. That could get expensive though.
__________________
My Stable: 2002 Yamaha YZF-R6 1988 Pontiac Fiero 1969 Pontiac Firebird I might get my '02 SS back....
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#9
08-06-2003, 04:24 AM
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You could port it fairly cheap. Lets see..Balanced & Blue Printed, you could look else where on the car too ie better radiator, aluminum drive shaft, ect. You also could look at different heads but again that can cost some money. Umm.. I think 6Xs would gain compression. The reason I keep telling you to up the compression is that in the mid 70s they ran around 7.5:1. I think it would produce better results if you went up to 8.5:1 to 9:1.
__________________
My Stable: 2002 Yamaha YZF-R6 1988 Pontiac Fiero 1969 Pontiac Firebird I might get my '02 SS back....
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#10
08-06-2003, 04:27 AM
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6x heads you say?
I was offered a set of 6x heads for 100 bucks canadian do you know other information about them because this is what I know about the heads the have oval exhaust ports there is a D above the left most exhaust port and 6X right above the 2 middle exhaust ports and overcomming this lack of compression is high on my list of things to do
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#11
08-07-2003, 10:00 PM
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Yeah that engine has 7.6:1 compression. Instead of decking the block you could have the heads milled, or both is porbably neccessary to get 9:1 compression. But get a long duration, short lift cam. Pontiac big blocks soak up duration like nothing I've ever seen. The headers and exhaust will help A LOT, the cam is a good idea cuz the stock one is a nothing cam. And also get the Edelbrock Performer RPM intake manifold.
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#12
08-07-2003, 10:38 PM
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you have read my mind, I was thinking of doing the exact things you juts said to do but all i need now is money
and could you give me any ideas on cams? like comp or crane? and what duration? and lift?
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#13
08-08-2003, 08:30 PM
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Comp cams, Extreme Energy series - XE262H. It has 218/224 [email protected]'', and .462/.470 lift.
My friend has a 77 T/A with a 400 in it, but he has a rebuilt 455 waiting to go in it. He put the XE268H in it, with 224/230 [email protected] and .477/.480 lift. But a 400 doesn't need as much cam as a 455, so the one I recommended is one step down.
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#15
08-09-2003, 10:42 AM
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400cu. Flat top pistons
No. 13 heads 288/296 Ultradyne Cam roller tip rockers Torker II Intake 650-750 carb. HEI dist. with aftermarket coil Headers 3000 converter if its auto 3.42-3.55 gear 26.5 inch tall tires This setup pushed my buddies 78 t/a to low 12's in the quarter
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