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Small block guys compression question. #888822 12/26/10 08:02 PM 12/26/10 08:02 PM
Joined: Jul 2006 Posts: 382 Roseville MN 7 72swgnr OP enthusiast
72swgnr OP enthusiast 7 Joined: Jul 2006 Posts: 382 Roseville MN	For you guys that run small blocks and IRON heads. Do you think 10.65-1 compression with closed chambered iron heads and a 251/257 duration cam and .038 quench will run on pump premium without detonation? What have you gotten away with build wise running pump premium?

Re: Small block guys compression question. [Re: 72swgnr] #888823 12/26/10 08:04 PM 12/26/10 08:04 PM
Joined: Jan 2003 Posts: 5,486 SoCal Brian Hafliger master
Brian Hafliger master Joined: Jan 2003 Posts: 5,486 SoCal	Quote: For you guys that run small blocks and IRON heads. Do you think 10.65-1 compression with closed chambered iron heads and a 251/257 duration cam and .038 quench will run on pump premium without detonation? What have you gotten away with build wise running pump premium? If your at least 1000ft above sea level and don't see summer heat over 100� I think you'll be fine. You could always slow down the advance curve some if needed. Brian Brian Hafliger

Re: Small block guys compression question. [Re: 72swgnr] #888824 12/26/10 08:08 PM 12/26/10 08:08 PM
Joined: Jun 2010 Posts: 3,112 LONG ISLAND fishy340 master
fishy340 master Joined: Jun 2010 Posts: 3,112 LONG ISLAND	if the gas ur using is truly 93 octane should be fine,i dont trust the gas stations near me

Re: Small block guys compression question. [Re: fishy340] #888825 12/26/10 09:07 PM 12/26/10 09:07 PM
Joined: Jul 2006 Posts: 382 Roseville MN 7 72swgnr OP enthusiast
72swgnr OP enthusiast 7 Joined: Jul 2006 Posts: 382 Roseville MN	Thanks guys. I will mix in some race gas when it goes on the dyno and to the track.

Re: Small block guys compression question. [Re: 72swgnr] #888826 12/26/10 09:29 PM 12/26/10 09:29 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Thanks guys. I will mix in some race gas when it goes on the dyno and to the track. If on the dyno it says more timing try it with less octane fuel... I have seen MOST of us are WAY to safe on octane but always start with more than is needed

Re: Small block guys compression question. [Re: 72swgnr] #888827 12/27/10 12:00 AM 12/27/10 12:00 AM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: For you guys that run small blocks and IRON heads. Do you think 10.65-1 compression with closed chambered iron heads and a 251/257 duration cam and .038 quench will run on pump premium without detonation? What have you gotten away with build wise running pump premium? Tried that with Hyper pistons and under 10:1 and broke an upper ring land. Duration in the 248 range. Fastest 300

Re: Small block guys compression question. [Re: 72swgnr] #888828 12/27/10 01:48 AM 12/27/10 01:48 AM
Joined: Nov 2003 Posts: 1,881 Pittsburgh,PA RTSrunner top fuel
RTSrunner top fuel Joined: Nov 2003 Posts: 1,881 Pittsburgh,PA	What iron heads are you using that have a closed chamber? RT

Re: Small block guys compression question. [Re: RTSrunner] #888829 12/27/10 03:15 AM 12/27/10 03:15 AM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	I'm at 11.2cr with a 360 and J's at 59cc, 205 cranking psi, i run 93 all the time but you got to do your homework!!

Re: Small block guys compression question. [Re: RTSrunner] #888830 12/27/10 10:04 AM 12/27/10 10:04 AM
Joined: Jul 2006 Posts: 382 Roseville MN 7 72swgnr OP enthusiast
72swgnr OP enthusiast 7 Joined: Jul 2006 Posts: 382 Roseville MN	Quote: What iron heads are you using that have a closed chamber? RT 62cc RHS heads prepped by Brian@IMM

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