GT 40P head conversion |
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shierh
Gold Member Joined: April-29-2015 Location: Florida Status: Offline Points: 605 |
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Posted: February-20-2019 at 5:57pm |
Im still considering the change. My engine is stock other than 30 over from rebuild. Stock pistons etc.
Engine is basic 1980's 351w. Im not changing anything but heads at this time. Any issues? |
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6147 |
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No issues, you will just be leaving some power on the table if you don't swap an intake.
Heads need to be drilled to 351 size bolts if they haven't already. Most likely should measure lifter preload as it could change some swapping head styles. |
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rosconole
Gold Member Joined: May-10-2008 Location: United States Status: Offline Points: 758 |
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Yes Performer intake some roller rockers would be nice. alot of times people selling heads and rockers together if you look around. Also always need to check pushrod length.
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1989 ski nautique ,1991 barefoot nautique, 1993 Mustang Cobra 1998 5.0 Magazine shootout invitee
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Orlando76
Grand Poobah Joined: May-21-2013 Location: Mount Dora, FL Status: Offline Points: 3108 |
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I used Clearwater Cylinder. Think they got them sent to the Tangerine Estate the next day, already drilled and waved the core charge because he knew my GT40’s were most likely cracked plus the marine use.
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Please support The Cystic Fibrosis Foundation
1976 Ski Nautique 351 Escort 1993 Ski Nautique purple and black 351 HO PCM |
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shierh
Gold Member Joined: April-29-2015 Location: Florida Status: Offline Points: 605 |
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Will do intake at a later date.
Why would push rods be an issue? Shop is already aware of the bolt hole size so should be fine. Lifter pre load? isnt that for gm engines? (0 lash then 3/4 turn beyond) Believe ford is torque it down and that's it. |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Pushrods should not be an issue but no one should bolt up an engine without checking any and all clearances. If block has been decked or heads cut, clearances over original will be changed. Lifter preload applies to all hydraulic push rod engines.
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halfnelly
Senior Member Joined: January-14-2013 Location: Maitland, FL Status: Offline Points: 253 |
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On pedestal mount non-adjustable rockers, the preload is adjusted with shims:
https://www.summitracing.com/parts/fms-m-6529-a302 |
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rosconole
Gold Member Joined: May-10-2008 Location: United States Status: Offline Points: 758 |
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I just bought another set of GT40 3 bar heads ;)
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1989 ski nautique ,1991 barefoot nautique, 1993 Mustang Cobra 1998 5.0 Magazine shootout invitee
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