3v question

eddy21x · January 23rd, 2012, 10:13 PM

well i can get a 3v shortblock really cheap

i was wondering can i use my 2v heads on it?

what would compression be around at?

alxs421 · January 23rd, 2012, 10:20 PM

Call Ron at Fox Lake Racing Motors. He would definetly have the answers you need.

eddy21x · January 24th, 2012, 12:52 AM

ill do that if no one answers here

eddy21x · January 24th, 2012, 01:27 AM

got this info from another forum interesting read

Do you mean a Mustang 3V shortblock or a cast iron truck 3V shortblock? They are internally the same, but the Mustang block will be aluminum. Supposedly, the Mustang aluminum block has provisions for the older motor mounts, so that shouldn't be an issue. The only other thing I can think of that jumps out is if your Mustang has an 8 bolt cast iron crankshaft and a Windsor block (supposed to be a "X" as the 8th character in your VIN). All of the 3V engines have the 6 bolt crank. Flywheel issues are solved with money.

The oil pump for the 3V engine is a different pump and it has a 15/16" opening where the pickup tube goes into it (I believe that is the Cobra diameter). The '99 2V has a 13/16" opening and won't fit. Buying a FRPP Cobra oil pump kit will give you a Cobra hi-volume pump and a Cobra pickup tube.

Everything else will physically bolt on and run with all of the 2V components, but you may need 100 octane Sunoco Unleaded to run it safely. The 1999 PI 2V heads have a tiny combustion chamber (42cc) and came from the factory with a 17cc dish piston to keep compression about 9.5-1. The 3V-headed engines have a mini-dish piston (6cc) and a bigger 50cc combustion chamber for about 10-1 compression.

If you put PI heads on that shortblock you will have nearly 12-1 compression. Great for n/a power, but forget any boost. Also, the factory 3V hypereutectics have a really high top ring and the top lip above the top ring is under 1/8" thick. Where the cut-out for the exhaust valve is located, the thickness is 1/16" thick. Even premium pump gas will cause pinging and will be almost a guarantee to snap that somewhere. I have included a pic I took of a new 3V piston to show you the issue (the ring land is in the middle of the gray band of

January 23rd, 2012, 10:13 PM	#1
eddy21x Hardcore Enthusiast '01 Gt Vert auto 13.2@103.8 n/a Stock stall Join Date: Jan 2010 Location: Raleigh, Nc Posts: 1,452 iTrader: 1 reviews	3v question well i can get a 3v shortblock really cheap i was wondering can i use my 2v heads on it? what would compression be around at? __________________ 253rwhp 294rwtq motor 337rwhp 427rwtq 90 shot

January 24th, 2012, 12:52 AM	#3
eddy21x Hardcore Enthusiast '01 Gt Vert auto 13.2@103.8 n/a Stock stall Join Date: Jan 2010 Location: Raleigh, Nc Posts: 1,452 iTrader: 1 reviews	ill do that if no one answers here __________________ 253rwhp 294rwtq motor 337rwhp 427rwtq 90 shot

January 24th, 2012, 01:27 AM	#4
eddy21x Hardcore Enthusiast '01 Gt Vert auto 13.2@103.8 n/a Stock stall Join Date: Jan 2010 Location: Raleigh, Nc Posts: 1,452 iTrader: 1 reviews	got this info from another forum interesting read Do you mean a Mustang 3V shortblock or a cast iron truck 3V shortblock? They are internally the same, but the Mustang block will be aluminum. Supposedly, the Mustang aluminum block has provisions for the older motor mounts, so that shouldn't be an issue. The only other thing I can think of that jumps out is if your Mustang has an 8 bolt cast iron crankshaft and a Windsor block (supposed to be a "X" as the 8th character in your VIN). All of the 3V engines have the 6 bolt crank. Flywheel issues are solved with money. The oil pump for the 3V engine is a different pump and it has a 15/16" opening where the pickup tube goes into it (I believe that is the Cobra diameter). The '99 2V has a 13/16" opening and won't fit. Buying a FRPP Cobra oil pump kit will give you a Cobra hi-volume pump and a Cobra pickup tube. Everything else will physically bolt on and run with all of the 2V components, but you may need 100 octane Sunoco Unleaded to run it safely. The 1999 PI 2V heads have a tiny combustion chamber (42cc) and came from the factory with a 17cc dish piston to keep compression about 9.5-1. The 3V-headed engines have a mini-dish piston (6cc) and a bigger 50cc combustion chamber for about 10-1 compression. If you put PI heads on that shortblock you will have nearly 12-1 compression. Great for n/a power, but forget any boost. Also, the factory 3V hypereutectics have a really high top ring and the top lip above the top ring is under 1/8" thick. Where the cut-out for the exhaust valve is located, the thickness is 1/16" thick. Even premium pump gas will cause pinging and will be almost a guarantee to snap that somewhere. I have included a pic I took of a new 3V piston to show you the issue (the ring land is in the middle of the gray band of __________________ 253rwhp 294rwtq motor 337rwhp 427rwtq 90 shot

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January 23rd, 2012, 10:20 PM	#2
alxs421 Newbie Join Date: Jun 2007 Posts: 16 iTrader: 0 reviews	Call Ron at Fox Lake Racing Motors. He would definetly have the answers you need.

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