454 Specs needed please!
#1
Registered
Thread Starter
Join Date: Mar 2005
Location: Mine Hill, NJ/Lake Hopatcong, NJ
Posts: 1,266
Likes: 0
Received 0 Likes
on
0 Posts
454 Specs needed please!
Can someone PLEASE provide me with as much information as possible on the TRS 400 Hp merc engine (cyclone). I'm doing a twin rebuild and the builder wants to know anything I can come u with about it. (ie. stock compression, cam specs, etc...) Thanks in advance.
P.S. Model year 1985
P.S. Model year 1985
#2
MarineKinetics
Platinum Member
Re: 454 Specs needed please!
prostock85,
Cam specs are as follows:
HYD-FLAT
298º/306º @ .005"
228º/236º @ .050"
.312"/.324" lobe
.530"/.551" valve
114º LSA
109º ICL
Bob
Cam specs are as follows:
HYD-FLAT
298º/306º @ .005"
228º/236º @ .050"
.312"/.324" lobe
.530"/.551" valve
114º LSA
109º ICL
Bob
#3
Registered
VIP Member
Join Date: Feb 2005
Location: Gallatin, TN
Posts: 937
Likes: 0
Received 0 Likes
on
0 Posts
Re: 454 Specs needed please!
I think I have the original manual at the house. I am going to be out on the boat all weekend but I should be home on Sunday. I could fax you or send it as a *.pdf with what I have Mon morning. I know I have a complete repair manual with all the info from 1988. That should be the same as yours. I also got some stuff from 1984. I'll have to look.
#4
Registered
Re: 454 Specs needed please!
The Merc 454cid 400hp Cyclone engine is a 4-bolt main block with all forged parts....crank, 7/16" dimpled rods, and pistons. It came with GM's rectangle port heads with 2.19" intake valves, and 1.88" exhaust valves, Crane Gold aluminum roller rocker arms, cast (finned) aluminum valve covers, and an aluminum hi-rise dual plane intake manifold.
These are good base engines to build from. And even thought the large rectangle port runner heads will still work they are still a bit too large/over kill for a 454cid marine engine. Usually, the smaller oval port heads with some bowl work will run better on a marine hi-perf engine destined to run at 5500rpm.
These are good base engines to build from. And even thought the large rectangle port runner heads will still work they are still a bit too large/over kill for a 454cid marine engine. Usually, the smaller oval port heads with some bowl work will run better on a marine hi-perf engine destined to run at 5500rpm.
#5
Registered
Thread Starter
Join Date: Mar 2005
Location: Mine Hill, NJ/Lake Hopatcong, NJ
Posts: 1,266
Likes: 0
Received 0 Likes
on
0 Posts
Re: 454 Specs needed please!
Thanks alot. The guy looking to build my engines said the same thing about the heads. He thinks the rectangular port heads should be scrapped in favor of oval. Any one have any???
#8
Registered
Re: 454 Specs needed please!
Originally Posted by prostock85
One more thing, what can a 454 be saftly bored/stroked to?
#9
Registered
Join Date: Mar 2004
Posts: 205
Likes: 0
Received 0 Likes
on
0 Posts
Re: 454 Specs needed please!
I built a 454 like you are talking about and I opted for the large oval port heads with 2.19/1.88 valves bowl blended and gasket matched and flowed the motor is in a 23 nova spyder runs 73 on gps and it has pulled a friend of mines 24baja that has a 502mag