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#1 Posted : Monday, 10 November 2003 10:07:28 PM(UTC)
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Hi all,


My ZH will get a hot 390 fitted very soon.


Bit of backlash in the diff though, could be time for a new one


I suspect it runs a 2.89


any recomendations for other ratios?


i think 4.11 is a bit extreme for street use


3.55 perhaps?

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#2 Posted : Monday, 10 November 2003 11:08:46 PM(UTC)
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4.11's aint to extreme but I'd be working out what rpm the cam works in. If it doesn't rev over 6000rpm go for 3.5's.


Brenden

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#3 Posted : Tuesday, 11 November 2003 12:00:27 AM(UTC)
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Thanks Brendan


your right, I need to get the cam specs...pretty wild cam I'd say considering i'm getting a 2500 stall converter with it


3.5's???


still be good for highway driving or will the revs be too high?

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#4 Posted : Tuesday, 11 November 2003 5:40:46 AM(UTC)
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i had a 3.5 in behind my 351 and i found it was reving too much at hyway speed.although i have always liked my engines to rev a little lower as it seems to give them a much longer life and seem to be user friendly.i dont think it makes that much differenc
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#5 Posted : Tuesday, 11 November 2003 6:14:51 AM(UTC)
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3.5's will be fine, as 2500rpm histall and 3.5's is a good match.


If you had a 3000rpm histall I'd suggest 3.7's.


3.5 should be about 2800-2900rpm @ 100kph.


I sit about 3500-3600 with 4.11's.


Brenden

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