Indy 440-1 Valve size in 4.35 bore - Moparts Forums

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Indy 440-1 Valve size in 4.35 bore #2870170 01/06/21 11:27 PM 01/06/21 11:27 PM
Joined: Apr 2016 Posts: 108 WNY Moparrob68 OP member
Moparrob68 OP member Joined: Apr 2016 Posts: 108 WNY	Upgrading my bracket race 440 to a 493 this winter. .704 lift roller cam with 1.6 rockers.Sent the Indy 440-1 heads out for porting. Replacing all the valves. Should I stick with the 2.19 intakes or switch to the 2.25 intakes? Would the 2.25 valves be too shrouded by the 4.35 bore?

Re: Indy 440-1 Valve size in 4.35 bore [Re: Moparrob68] #2870173 01/06/21 11:36 PM 01/06/21 11:36 PM
Joined: Mar 2003 Posts: 9,096 Rogue River, OR Jeremiah master
Jeremiah master Joined: Mar 2003 Posts: 9,096 Rogue River, OR	2.25 will fit, 2.30 needs a bigger bore and possibly a smaller exhaust valve. (1.78) due to radial clearance.

Re: Indy 440-1 Valve size in 4.35 bore [Re: Jeremiah] #2870398 01/07/21 12:34 PM 01/07/21 12:34 PM
Joined: Jan 2003 Posts: 9,982 Frostbitefalls MN (Rocky&Bullw... gregsdart master
gregsdart master Joined: Jan 2003 Posts: 9,982 Frostbitefalls MN (Rocky&Bullw...	Many motors run good with a 4.375 bore, which is only .0125 further from the valve. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

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