305 TPI with TBI heads, need timing suggestions.
04-22-2009, 11:24 AM
#1
305 TPI with TBI heads, need timing suggestions.
Title says it all, I've built a TPI 305 with stock LT1 cam and TBI heads. I'm sure these heads have different timing requirements than the 081s did, so I'm just looking for suggestions if anyone has done any TBI tuning and knows about what they like timing wise. I may just dump the timing values from a TBI tune in to the stock TPI 5spd .bin and start from there. Thanks guys.
Last edited by 1MeanZ; 04-22-2009 at 11:31 AM.
09-17-2010, 01:39 PM
#4
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Car: 1988 Monte Carlo SS
Engine: 5.7L TPI
Transmission: T5
Axle/Gears: 3.73
Re: 305 TPI with TBI heads, need timing suggestions.
Yes, put the TBI table in as the starting point. (been there done that)
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10-04-2010, 10:46 PM
#10
Re: 305 TPI with TBI heads, need timing suggestions.
I have centerbolt heads, but i have an 86 iroc... they rebuilt the engine before i bought it.. could it be possible there were some 86 irocs with this head? Or are the heads NOT from my original engine?
10-05-2010, 07:06 AM
#11
Re: 305 TPI with TBI heads, need timing suggestions.
center bolts are not original to an 86 engine, but they are no different than the perimeter style 416 heads as far as the ports are concerned. The only difference is the center bolt valve cover bolts and the angle of the middle 2 intake bolts is at a slightly different angle but you can fix that by drilling the intake out slightly.
If the engine has center bolts on it, you may have a later engine all together. Check the numbers on the bellhousing pad behind the driver's side head and run them on mortec.com You may have a later roller cam block as well.
If the engine has center bolts on it, you may have a later engine all together. Check the numbers on the bellhousing pad behind the driver's side head and run them on mortec.com You may have a later roller cam block as well.
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