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Old 07-22-2012, 05:48 PM   #1
Phil Gillespie
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Default 1939 V/8 221cu Pistons

Have 1939 221cu 3 1/16" . 80 thou oversized. Where to get good pistons and ring set for this engine. Also fitted with Edelbrock heads. Are there prefered pistons for these heads.
Max compression should only be 8:1 in view of the 80 Thou oversized?
Once set up would a little later ignition timing be prefered.

Appreciate all assistance.
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Old 07-22-2012, 05:52 PM   #2
Kube
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Default Re: 1939 V/8 221cu Pistons

I have had good fortune with Speedway. I've done perhaps six (or more) engines in the past three years. Decent prices and great service. I did have one problem, one time. One of the eight pistons was not within specification. They sent out a correct piston immediately and sent a call slip to pick up the non-conforming one. Can't expect better then that in my opinion.
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Old 07-22-2012, 08:48 PM   #3
flatjack9
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Default Re: 1939 V/8 221cu Pistons

I've also had good luck with Speedway, but sometimes they don't stock 80 overs. Have gone to Red's then with good luck. No, you don't want later timing. Check clearance over the piston, shoot for .040 to .050 clearance.
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Old 07-22-2012, 10:26 PM   #4
Ol' Ron
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Default Re: 1939 V/8 221cu Pistons

Why not bore to 3 3/16 and use stock 8BA pistond, have done that several tiomes. Increases CR about 1 point.
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Old 07-23-2012, 03:08 AM   #5
Phil Gillespie
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Default Re: 1939 V/8 221cu Pistons

Thanks Kube as in New Zealand the 80 thou oversized are a little rare
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Old 07-23-2012, 03:24 AM   #6
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Default Re: 1939 V/8 221cu Pistons

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Ron thanks for your assistance. I understood that max recommended oversize was 125 thou?
This engine has had its problems.
The block has been machined with LHS fitted with standard head, RHS fitted with truck head in attempt to balance CR.
1st failure too little clearance and knocked out bottom end brgs when pistons contacting head.

latest failure: Detonation damage RHS pistons. Now being investigated by Engine Reconditioner who carried out job. I should have thought clearances would have been carefully checked.As now this bank RHS is showing pistons protruding higher than RHS due to surface macining of contact surface block to head.
Edelbrock heads were fitted at last O/haul and now seems this RHS bank which has detonation damage shows CR of 8.3 :1.
This has been a little frustrating as the initial guy who did 1st rebuild has passed away. These things seem to take time!!!

Very grateful for all advice and assistance given here at Ford barn
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Old 07-23-2012, 07:50 AM   #7
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Default Re: 1939 V/8 221cu Pistons

Quote:
Originally Posted by Phil Gillespie View Post
Ron thanks for your assistance. I understood that max recommended oversize was 125 thou?
This engine has had its problems.
The block has been machined with LHS fitted with standard head, RHS fitted with truck head in attempt to balance CR.
1st failure too little clearance and knocked out bottom end brgs when pistons contacting head.

latest failure: Detonation damage RHS pistons. Now being investigated by Engine Reconditioner who carried out job. I should have thought clearances would have been carefully checked.As now this bank RHS is showing pistons protruding higher than RHS due to surface macining of contact surface block to head.
Edelbrock heads were fitted at last O/haul and now seems this RHS bank which has detonation damage shows CR of 8.3 :1.

This has been a little frustrating as the initial guy who did 1st rebuild has passed away. These things seem to take time!!!

Very grateful for all advice and assistance given here at Ford barn
I hate hearing stories like yours and feel for you. I am certain the added frustration and associated costs can be discouraging.
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