• When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

1971 383 compression height

gtxrt

Well-Known Member
Local time
4:40 AM
Joined
Feb 18, 2021
Messages
333
Reaction score
183
Location
central ny
doe's anyone know the piston compression height on a 1971 383 hp motor. thanks.
 
doe's anyone know the piston compression height on a 1971 383 hp motor. thanks.
I took apart a standard bore 71 383 hp a few years ago. It was around 60 to 70 in the hole. With steel head gaskets and 906 heads, it came out around 8.2 to 1
 
that would make the pin compression height 1.87 doe's that sound right ?
 
got a hold of a stock 71 383 hp piston, came out to 1.865 compression height. .055-.065 in the hole on a stock motor comes out right.
 
got a hold of a stock 71 383 hp piston, came out to 1.865 compression height. .055-.065 in the hole on a stock motor comes out right.
OK, cool. The motor I put back together still ran strong, just needed a bit more stall speed since low compression makes a 383 a little soft on the bottom end.
 
Last edited:
Auto Transport Service
Back
Top