running boost with AFR 58cc heads

dragstang86 · 10-22-2002, 06:02 PM

How much boost can you safely run using the AFR 185 58cc heads on a stock bottom 306 with shot peened and polished stock rods? How much compression is that anyway? I want it to remain streetable.

thanks for the help,
bryan

jonnyk · 10-22-2002, 09:47 PM

Streetable is a relative term, but I'll assume you mean pump gas. It will also depend on which type of blower or turbo you are planning to run. An S-trim would probably be ok at around 8-9 psi? The heads will make about 9.5:1 compression with a stock shortblock.

LaxMan · 10-22-2002, 10:28 PM

jonnyk is right about being relative........

I have 60cc chamber Darts with fly cut pistons and I was able to run 9 psi with a chip. (Powerdyne 11lb pulley and their chip).

I was also able to run 11 psi with a T-trim with a stock pulley
BUT!
When I went to a 2.85 blower pulley (13psi) I melted 2 piston.

All of this was with 93 octane.

10-22-2002, 06:02 PM	#1
dragstang86 Registered Member Join Date: Sep 2002 Location: baltimore, md Posts: 220	running boost with AFR 58cc heads How much boost can you safely run using the AFR 185 58cc heads on a stock bottom 306 with shot peened and polished stock rods? How much compression is that anyway? I want it to remain streetable. thanks for the help, bryan __________________ 90 LX Hatchback 306, AFR 165's 58cc, E303, 1.6 roller rockers, 70mm throttle body, cobra intake, bbk fenderwell, bbk longtubes, x-pipe, flowmasters, pullies, msd 6a, crane ps-92, stock MAF sensor, electric fan, No AC, No air pump, flaming river quick ratio rack C-4, 3500 stall, 373's, aluminum driveshaft SSM Lift bars, , sub frame connectors, strut tower brace 12.57 @105.12mph w/ 1.686 60ft before bbk longtubes (with equal shorties) ----------------------------------------- 86 tube chassis coupe - the trailor queen

10-22-2002, 09:47 PM	#2
jonnyk Being stroked is great Join Date: Oct 1998 Location: Alberta, Canada Posts: 772	Streetable is a relative term, but I'll assume you mean pump gas. It will also depend on which type of blower or turbo you are planning to run. An S-trim would probably be ok at around 8-9 psi? The heads will make about 9.5:1 compression with a stock shortblock. __________________ Novi 2000 now spinning off the snout of the 331... Mods Pics

10-22-2002, 10:28 PM	#3
LaxMan Registered Member Join Date: Jan 1999 Location: Sugarland, TX Posts: 458	jonnyk is right about being relative........ I have 60cc chamber Darts with fly cut pistons and I was able to run 9 psi with a chip. (Powerdyne 11lb pulley and their chip). I was also able to run 11 psi with a T-trim with a stock pulley BUT! When I went to a 2.85 blower pulley (13psi) I melted 2 piston. All of this was with 93 octane. __________________ 306DSS, AOD, T-Trim Vortech #3325 w/ driver 6.9882@100.33 1/8th

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