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Author Topic:   Hey Alex, I need some help
jdsgallops
Gearhead

Posts: 247
From: Green Bay, WI
Registered: Feb 2001

posted 10-04-2001 01:54 PM     Click Here to See the Profile for jdsgallops   Click Here to Email jdsgallops     Edit/Delete Message   Reply w/Quote
Alex I am helping a friend build a 351 for his 70 mach 1 right now. He is not building a race car, just a peppy fun driver. He has settled on a cam with 214/[email protected] .050 472/490 lift. The problem we are having is in the piston selection. He wants to stay near the stock 9-1 compression. He has purchased stock replacememnt pistons but they cam without valve reliefs, so we are now concerned that we will not have enough piston to valve clearance. I know you have done this calculation for others before, can you help here? Thanks John

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Moneymaker
Administrator

Posts: 8916
From: Lyons, IL, USA
Registered: May 99

posted 10-05-2001 03:52 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
John, please get me the piston manufacturer and part number. I'll do the rest from that information.

------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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jdsgallops
Gearhead

Posts: 247
From: Green Bay, WI
Registered: Feb 2001

posted 10-06-2001 01:07 AM     Click Here to See the Profile for jdsgallops   Click Here to Email jdsgallops     Edit/Delete Message   Reply w/Quote
Alex the machine shop found a different piston to use now so we should be ok. This one is a badger with valve reliefs. I am puzzled in that it says it will give 8.6-1 compression. That is less than stock on a 2bbl 351. It covered the years from 69-72 so that number should be with the small chamber early head. Do you think the dish is bigger or did they use a bigger chamber head for the ratio? Thanks again. John

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Moneymaker
Administrator

Posts: 8916
From: Lyons, IL, USA
Registered: May 99

posted 10-06-2001 11:23 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Badger is a good supplier that specializes in the "rebuilders" market John. They produce pistons to fit a variety of applications within the same engine family. The only way to absolutly compute the compression ratio is to measure the cylinder volume and cc the combustion chamber of the head.

------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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jdsgallops
Gearhead

Posts: 247
From: Green Bay, WI
Registered: Feb 2001

posted 10-07-2001 10:27 PM     Click Here to See the Profile for jdsgallops   Click Here to Email jdsgallops     Edit/Delete Message   Reply w/Quote
Thanks Alex!

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