2.5 245 carb cutting heads

[pappa pete]

OK guy's time to bump it up some, want to up the HP on the old 245, comp is 129 the rest is 134-6 leakdown 4-7%, want up comp as much as I can looking at using aces to mix with 91-93 octane can't get non ethanol premium here, recommended free comp please. Thanks

[Dave Strong]

Ran 34cc on my 245hp at 3000' on non ethanol 92, had 145psi. would think 34 would be safe.

Dave

[pappa pete]

I know I would have to run 93 and aces all the time but thinking 160

[texasvector]

Are u gaining enough to make the risk worth it?

U draging it?

edit...^^^i agree with the 34 ....asking about the 160

[superboattwin250]

We all run 34cc on ours Motors and it seems to work out well

[eli]

34 with 1 mm gasket

[dompie99]

Would it be OKAY if he would shave the heads a little more and include the 1mm of the gasket into the shaving ??

[pappa pete]

Hell I don't know that's why I'm asking the guru's on here, like everybody here never enough hp, I seen jay Smith's evaluation of aces and was impressed, just want more hp figured cut head was best way, I've got 1" spacer,CC reeds already,

[TripleA]

I ran 175-180 #'s on my 260 for over a year with aces, klotz and GOOD 93 octane. Personally I didn't see enough difference from 140-180 to justify the stress on my motor. Still running the aces but running 140 pounds of compression and a few stages of nitrous now

[texasvector]

Personally I didn't see enough difference from 140-180 to justify the stress on my motor.

kinda what i was getting at.......i could see if you were racing and 160 was max for that class

[pappa pete]

I'm not racing now but maybe later on, just would like some cheap hp, figured 160 wouldn't be too bad maybe 150, just checking out options before biting bullet

[Dave Strong]

Healthy motor at sea level will be real close to 150psi with 34cc. Rarely seemuch top end gains but make a big diff in the mid range, also seem to start and idle better.

Dave

[P man]

I've been running my 245block with stock porting and 34cc heads for years on 91 with no issues at 300ft above sea level.
Run it a little fat and don't go nuts on the timing.
With the block decked probably 18 thou or so I make roughly 150-155psi on my tester