engine block

88mstang · June 17th, 2007, 10:55 PM

i just bought a 91 gt and the guy that built the car said it had the block out of a 69 or 70 mustang. is there a power handling differance between the older blocks and the block that should have come in the car. if so about how much?

NottyBoy93 · June 17th, 2007, 11:19 PM

Darrell would probably know better than I, I think he is running a retro block, but basically the blocks are somewhat stronger, there will always be an issue with main cap flex though on the two bolt main blocks regardless of age. That inevitably is the weak link.

HACKGT350 · June 17th, 2007, 11:47 PM

it should also be a flat tappet cam now instead of a roller, unless he did the conversion

neverfastenough1 · June 18th, 2007, 12:50 AM

Did he say whether it was a four bolt or two bolt? The Boss engine was out in '69 & '70.

NottyBoy93 · June 18th, 2007, 12:52 AM

Doesn't appear as though he had. That is why I made the caviat about two bolt mains. If it is an original boss then FTW

88mstang · June 18th, 2007, 03:05 PM

the guy that had the car built really couldn't tell me much all he did when he had the car built was wright the check. all he could say was it was out of a 69 or 70 and that it had a roller cam in it

June 17th, 2007, 10:55 PM	#1
88mstang Regular Join Date: Nov 2006 Location: Stafford,VA Posts: 87 iTrader: 0 reviews	engine block i just bought a 91 gt and the guy that built the car said it had the block out of a 69 or 70 mustang. is there a power handling differance between the older blocks and the block that should have come in the car. if so about how much?

June 18th, 2007, 12:50 AM	#4
neverfastenough1 Hardcore Enthusiast 2002 Mustang GT Join Date: May 2007 Location: Savannah, Ga Posts: 2,789 iTrader: 3 reviews	Did he say whether it was a four bolt or two bolt? The Boss engine was out in '69 & '70. __________________

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June 17th, 2007, 11:19 PM	#2
NottyBoy93 Regular 1993 Notch, 1988 Notch Join Date: Feb 2007 Location: Location, Location Posts: 156 iTrader: 0 reviews	Darrell would probably know better than I, I think he is running a retro block, but basically the blocks are somewhat stronger, there will always be an issue with main cap flex though on the two bolt main blocks regardless of age. That inevitably is the weak link.

June 17th, 2007, 11:47 PM	#3
HACKGT350 Regular Join Date: Apr 2007 Posts: 81 iTrader: 0 reviews	it should also be a flat tappet cam now instead of a roller, unless he did the conversion

June 18th, 2007, 12:52 AM	#5
NottyBoy93 Regular 1993 Notch, 1988 Notch Join Date: Feb 2007 Location: Location, Location Posts: 156 iTrader: 0 reviews	Doesn't appear as though he had. That is why I made the caviat about two bolt mains. If it is an original boss then FTW

June 18th, 2007, 03:05 PM	#6
88mstang Regular Join Date: Nov 2006 Location: Stafford,VA Posts: 87 iTrader: 0 reviews	the guy that had the car built really couldn't tell me much all he did when he had the car built was wright the check. all he could say was it was out of a 69 or 70 and that it had a roller cam in it

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