402 block with ls5 heads
Thread Starter
Pro
Joined: Dec 2005
Posts: 709
Likes: 1
From: Lakewood Colorado
402 block with ls5 heads
Is a 3969854 block and 336781 heads a functional combination? Are there any advantages/ disadvantages?
Anybody have any insight on performance. I don't have cam specs and wont for abour a week. Performer 2 intake or LS5 stock intake.
Anybody have any insight on performance. I don't have cam specs and wont for abour a week. Performer 2 intake or LS5 stock intake.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
A simple upgrade is to increase the exhaust valve size.
These heads have 2.19 Int/1.72 Exh valves. Bumping the
Exh to 1.88 is easy during a rebuild and delivers rewarding
results.
For my purposes back in the day, an Edelbrock C396
dual-plane oval-port spreadbore intake was judged most
suitable. To the best of my knowledge, the C396 is
discontinued, I believe that the Performer 2-0 is its
successor (#2161 non-EGR, #3761 EGR - other p/ns for
special finishes)
Manifold height: A-4.300", B-5.400"
Port exit dimensions: 1.70" x 1.68"
Other manufacturers no doubt offer updated intakes
for use with oval port heads.
.
These heads have 2.19 Int/1.72 Exh valves. Bumping the
Exh to 1.88 is easy during a rebuild and delivers rewarding
results.
For my purposes back in the day, an Edelbrock C396
dual-plane oval-port spreadbore intake was judged most
suitable. To the best of my knowledge, the C396 is
discontinued, I believe that the Performer 2-0 is its
successor (#2161 non-EGR, #3761 EGR - other p/ns for
special finishes)
Manifold height: A-4.300", B-5.400"
Port exit dimensions: 1.70" x 1.68"
Other manufacturers no doubt offer updated intakes
for use with oval port heads.
.
