The Ford Barn

Enbloc · 10-23-2012, 09:19 AM

I've recently picked up some used, new Edelbrock heads. The engine in my '36 is a small bore 24 stud (81A).

Is it worth me bolting them on the small bore engine or does the drop in capacity/compression ratio make them worthless on the smaller engine?

I'm already running the stock 81A heads skimmed 60 thou.

Thanks

Brian · 10-23-2012, 12:13 PM

By all means run them; do the piston to head clearance check and machine them to acheive .050" squish.

Enbloc · 10-23-2012, 06:26 PM

What sort of compression drop can I expect by using the Edelbrock heads on my 3 1/16 bore motor as the heads are designed for a 3 3/16 bore motor.

Walt Dupont--Me. · 10-23-2012, 06:31 PM

I don't think you'll find a drop, I think you'll have an increase. When you get your heads off see if you can compare the CC in both. Walt

Ol' Ron · 10-23-2012, 08:09 PM

Walts right CCing is the only way to find these things out. guestamates just don't cut it.

Enbloc · 10-24-2012, 01:04 PM

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Thanks for the info.

10-23-2012, 09:19 AM	#1
Enbloc Senior Member Join Date: May 2010 Location: London, UK. Posts: 195	Edelbrock Heads On 221 Motor? I've recently picked up some used, new Edelbrock heads. The engine in my '36 is a small bore 24 stud (81A). Is it worth me bolting them on the small bore engine or does the drop in capacity/compression ratio make them worthless on the smaller engine? I'm already running the stock 81A heads skimmed 60 thou. Thanks

10-23-2012, 12:13 PM	#2
Brian Senior Member Join Date: May 2010 Location: Masterton, New Zealand Posts: 3,832	Re: Edelbrock Heads On 221 Motor? By all means run them; do the piston to head clearance check and machine them to acheive .050" squish.

10-23-2012, 06:26 PM	#3
Enbloc Senior Member Join Date: May 2010 Location: London, UK. Posts: 195	Re: Edelbrock Heads On 221 Motor? What sort of compression drop can I expect by using the Edelbrock heads on my 3 1/16 bore motor as the heads are designed for a 3 3/16 bore motor.

10-23-2012, 06:31 PM	#4
Walt Dupont--Me. Senior Member Join Date: May 2010 Location: Gardiner Me. Posts: 4,200	Re: Edelbrock Heads On 221 Motor? I don't think you'll find a drop, I think you'll have an increase. When you get your heads off see if you can compare the CC in both. Walt

10-23-2012, 08:09 PM	#5
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,859	Re: Edelbrock Heads On 221 Motor? Walts right CCing is the only way to find these things out. guestamates just don't cut it.

10-24-2012, 01:04 PM	#6
Enbloc Senior Member Join Date: May 2010 Location: London, UK. Posts: 195	Re: Edelbrock Heads On 221 Motor? Sponsored Links (Register now to hide all advertisements) Thanks for the info.