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DirtKing · 03-12-2001, 11:45 AM

I'd use the 351 if you're gonna stroke it, but the a4 IS a great block. 10.9:1 will run fine with aluminum heads, especially with the 351's better rod ratio.

hey miracle, I think the very article you referred too built a 400hp 450ftlbs torque using a long rod 351....11:1 compression on 87 octane! 32 degrees of total advance tell ya how efficient the motor was. That was with what would now be a stock 5.0 efi cam.
The reason ratio handles more compression is due to the more efficient combustion. so- `called bad ratios rely on faster pison speeds to promote better cylinder filling...

anyway, I'm building a 12.5:1 version, so I'll let ya know what gas I have to run. I'm looking for about 550hp@6500! I'll post the dyno numbers too.

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88LX notch, Speedpro EFI Procharged!

03-12-2001, 11:45 AM	#31
DirtKing Registered Member Join Date: Feb 1999 Location: brooklyn center,mn,USA Posts: 169	I'd use the 351 if you're gonna stroke it, but the a4 IS a great block. 10.9:1 will run fine with aluminum heads, especially with the 351's better rod ratio. hey miracle, I think the very article you referred too built a 400hp 450ftlbs torque using a long rod 351....11:1 compression on 87 octane! 32 degrees of total advance tell ya how efficient the motor was. That was with what would now be a stock 5.0 efi cam. The reason ratio handles more compression is due to the more efficient combustion. so- `called bad ratios rely on faster pison speeds to promote better cylinder filling... anyway, I'm building a 12.5:1 version, so I'll let ya know what gas I have to run. I'm looking for about 550hp@6500! I'll post the dyno numbers too. ------------------ 88LX notch, Speedpro EFI Procharged!