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Old 04-14-2013, 09:21 PM
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Help with 305 HO heads!!

Hi, guys this is my 1st post on here and I have a Question. I just got a set of 305 HO heads: 14014416 and #624. They are good heads but I would like to know if they will work on a 350 bored 40 over with flat tops. Also need the best street cam and lifters for it. The motor is going in my 1927 model A Rat Rod so it is just a cruiser not a racer. It has 373s in the rearend and a 2 speed power glide trans and we drive it on the hiway quite a bit. Like I said its not a race car just a strong cruiser. All your ideas are greatly appreciated!! Chasman

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Old 04-14-2013, 10:45 PM
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chasman,welcome. 3.73 gears? hope the tires are 30 plus inches tall for hiway use.
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Old 04-16-2013, 02:33 AM
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Quote:
Originally Posted by chasman View Post
Hi, guys this is my 1st post on here and I have a Question. I just got a set of 305 HO heads: 14014416 and #624. They are good heads but I would like to know if they will work on a 350 bored 40 over with flat tops. Also need the best street cam and lifters for it. The motor is going in my 1927 model A Rat Rod so it is just a cruiser not a racer. It has 373s in the rearend and a 2 speed power glide trans and we drive it on the hiway quite a bit. Like I said its not a race car just a strong cruiser. All your ideas are greatly appreciated!! Chasman
I ran a Comp 268HE cam .454/.454 lift on a 350 with 416 heads/64cc and flat top pistons and was happy with it!
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Old 04-16-2013, 10:00 AM
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Why do you say I would need 30"+ tires?? I have ran 373s in several of my cars with great luck and still had performance. I am however considering going to a TH350 OR 400!!
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Old 04-16-2013, 10:06 AM
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Originally Posted by vinniekq2 View Post
chasman,welcome. 3.73 gears? hope the tires are 30 plus inches tall for hiway use.
Why do you say I need to run 30"+ tires? I have used 373s in many of my street cars with great luck and performance!! I am however considering a TH350 or 400 instead of the 2 speed power glide.
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Old 04-16-2013, 05:24 PM
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You will have great performance, just that the revs will be a bit high, esp. since you "drive it on the hiway quite a bit." And to cruise at 70mph requires 3300rpm, and thats not figuring any torque converter slippage at all. Just taching a too much rpm for decent fuel economy ofr mainly highway use.

26" tire, 1:1 drive, 3.73 gear, 60 mph=2900rpm, 70mph=3300rpm, 80mph=2800rpm

swap to 30" tires=60mph=2700rpm, 70mph=2900rpm, 80mph=3350rpm

Obvioulsy swapping to a th-350 or th-400 wont make a difference to cruise rpm. A th-350C with lockup would bring rpm down 150rpm or so.

peace
Hog
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Old 04-16-2013, 05:48 PM
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I run 28" tire with 3.73 through a th350c. In lockup it is under 2800rpm at 60mph. It is a daily driver.
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Old 04-16-2013, 05:54 PM
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For a daily driver the rpm is a bit high for a fun weekend toy you'll be fine. With those heads and gears I'd go with a 268 cam and swap in a 700r4 when you get the time and money.
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Old 04-16-2013, 09:14 PM
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I run .82 over drive and 60 mph is just over 2,000 rpm. Im using 27 1/2 tall tires.I have run as high as 5.57 gears on a street car.If you like the engine at higher RPMs then 3.73 is your cruising gears. A mild engine is nicer imo at 2k.
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Old 04-18-2013, 09:29 PM
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Well I am running 28" tall tires and at 65 mph its running right at 2700 rpm's. It seems to do fine. I know that the rpm's are sort of high but it runs and sounds great going down the road. I don't drive it everyday, mostly on weekends, weather permitting of course!! We have a blast with it and needless to say it gets tons of looks and comments. Thanks for the input all. Chas
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