repower 283/HF7 with 350 questions
Posted: Sun Apr 07, 2013 11:04 am
Good Morning.
I'm new to the Club and have been reviewing previous posts for answers to my these questions, but have not found all of them.
I have a 20' 1962 Holiday that originally was fitted with the 431. I purchased the boat without an engine/transmission and was able to acquire a 283 flywheel forward engine with a model HF7DR Paragon hydraulic gear. The engine is worn out but all of the Chris Craft marine hardware is present.
My plan is to replace the 283 with a re-manufactured marine 350 long block and use the HF7 gear.
Question #1:
Because this boat originally had the 431ci/275HP engine, the upgrade to a roughly 250hp SBC should not be too much power for the boat. Will the 185hp 283 components (intake manifold, carburetor, exhaust manifolds, water pump, etc.) be able to support the 250hp from the 350 new engine?
Question #2:
It appears from other forum posts that if I source a 1967-79 350 marine long block, all of the 283 CC specific components will fit up properly. Am I missing anything with this idea?
Question #3:
On-line information that I have seen suggests that the HF7 is suited for the 185hp 283, but that is near the maximum rated hp. Does anyone have experience with mating a 250hp engine to an HF7 gear? What might be the failure mode if I do run this gear with this higher horsepower engine? If an upgrade is needed, please provide gear specifics.
I've got a long way to go to get this boat back on the water, but want to start collecting the proper parts and knowledge now.
Thanks in advance for any and all replies.
I'm new to the Club and have been reviewing previous posts for answers to my these questions, but have not found all of them.
I have a 20' 1962 Holiday that originally was fitted with the 431. I purchased the boat without an engine/transmission and was able to acquire a 283 flywheel forward engine with a model HF7DR Paragon hydraulic gear. The engine is worn out but all of the Chris Craft marine hardware is present.
My plan is to replace the 283 with a re-manufactured marine 350 long block and use the HF7 gear.
Question #1:
Because this boat originally had the 431ci/275HP engine, the upgrade to a roughly 250hp SBC should not be too much power for the boat. Will the 185hp 283 components (intake manifold, carburetor, exhaust manifolds, water pump, etc.) be able to support the 250hp from the 350 new engine?
Question #2:
It appears from other forum posts that if I source a 1967-79 350 marine long block, all of the 283 CC specific components will fit up properly. Am I missing anything with this idea?
Question #3:
On-line information that I have seen suggests that the HF7 is suited for the 185hp 283, but that is near the maximum rated hp. Does anyone have experience with mating a 250hp engine to an HF7 gear? What might be the failure mode if I do run this gear with this higher horsepower engine? If an upgrade is needed, please provide gear specifics.
I've got a long way to go to get this boat back on the water, but want to start collecting the proper parts and knowledge now.
Thanks in advance for any and all replies.