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frankie
Buffalo

USA
62 Posts

Posted - 09 Nov 2016 :  10:43:22 PM  Show Profile  Reply with Quote
hey you all , i have just started to replace my 2 1/4 exhaust with a 3 inch system from headers back with 3 in dyromax turbo mufflers.What do you think i can expect with my 462 6X heads milled down to 89cc and they been ported and polished? I feel that i have been choking the engine.

Blued and Painted
Chief PONTIAC

USA
3409 Posts

Posted - 10 Nov 2016 :  11:11:48 AM  Show Profile  Reply with Quote
Looks close to 10 to 1..Depends on camshaft and rear gear.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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frankie
Buffalo

USA
62 Posts

Posted - 11 Nov 2016 :  12:45:06 AM  Show Profile  Reply with Quote
Duration Exhaust: 294
Duration Intake: 289
Duration at 050 Exhaust: 241
Duration at 050 Intake: 235
Intake Centerline: 104
Lobe Separation: 108
Engine Manufacturer: Pontiac
RPM Range: 2700 to 6500
Valve Lift Exhaust: .503
rear end is 3.73
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frankie
Buffalo

USA
62 Posts

Posted - 11 Nov 2016 :  12:47:02 AM  Show Profile  Reply with Quote
it is best to have two ppl install this, i learned that do not tighten down the clamps until your sure it is all in position.
it is a bitch trying to rotate a pipe even with the clamp loose
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Blued and Painted
Chief PONTIAC

USA
3409 Posts

Posted - 11 Nov 2016 :  09:28:52 AM  Show Profile  Reply with Quote
quote:
Originally posted by frankie

I feel that i have been choking the engine.

Will definitely not be choking.
Should be very strong in the mid and upper rpm range


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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frankie
Buffalo

USA
62 Posts

Posted - 13 Nov 2016 :  12:27:07 AM  Show Profile  Reply with Quote
it is all in and now to get it welded , but sounds throaty over all the exhaust leaks
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